Backtrader 文档学习-Quickstart

0. 前言

backtrader，功能十分完善，有完整的使用文档，安装相对简单（直接pip安装即可）。
优点是运行速度快，支持pandas的矢量运算；支持参数自动寻优运算，内置了talib股票分析技术指标库；支持多品种、多策略、多周期的回测和交易；支持pyflio、empyrica分析模块库、alphalens多因子分析模块库等；扩展灵活，可以集成TensorFlow、PyTorch和Keras等机器学习、神经网络分析模块。
缺点：backtrader学习起来相对复杂，编程过程中使用了大量的元编程（类class），如果Python编程基础不扎实（尤其是类的操作），学习困难。另外一点，BackTrader不更新。

如果将backtrader包分解为核心组件，主要包括以下组成部分：

• （1）数据加载（Data Feed）：将交易策略的数据加载到回测框架中。
• （2）交易策略（Strategy）：该模块是编程过程中最复杂的部分，需要设计交易决策，得出买入/卖出信号。
• （3）回测框架设置（ Cerebro）：
  需要设置：（i）初始资金（ii）佣金（iii）数据馈送（iv）交易策略（v）交易头寸大小。
• （4）运行回测：运行Cerebro回测并打印出所有已执行的交易。
• （5）评估性能（Analyzers）:以图形和风险收益等指标对交易策略的回测结果进行评价。

官网说明资料详细，有演示用例，逐步跟着一步步学习。

Backtrader 官网文档

1. 两个基本概念

（1）Lines

“Lines”是backtrader回测的数据，由一系列的点组成，通常包括以下类别的数据：Open（开盘价）, High（最高价）, Low（最低价）, Close（收盘价）, Volume（成交量）, OpenInterest（无的话设置为0）。Data Feeds（数据加载）、Indicators（技术指标）和Strategies（策略）都会生成 Lines。
价格数据中的所有”Open” (开盘价)按时间组成一条 Line。所以，一组含有以上6个类别的价格数据，共有6条 Lines。如果算上“DateTime”（时间，可以看作是一组数据的主键），一共有7条 Lines。当访问一条 Line 的数据时，会默认指向下标为 0 的数据。最后一个数据通过下标 -1 来访问，在-1之后是索引0，用于访问当前时刻。因此，在回测过程中，无需知道已经处理了多少条/分钟/天/月，”0”一直指向当前值，下标 -1 来访问最后一个值。
Lines包括一个或多个line，line是一系列的数据，在图中可以形成一条线（line），有6个列数据，就是股票的主要数据集，最后一列没有用。

Open, High, Low, Close, Volume, OpenInterest

包括索引列“DateTime”，日期时间类型，注意：Datetime类型，不是Date类型。

（2）Index 0 Approach

访问行中的值时，将使用索引0访问当前值；
“最后一个”输出值是用索引**-1**访问，index-1用于访问可迭代项/数组的“最后”项。

在Backtrader中提供了1个函数来度量已处理数据bar的长度：
len：返回当前系统已经处理的数据（bars）。这个和python标准的len定义差异。

（3）版本

通过 pip index versions backtrader 检查版本。
版本：backtrader (1.9.78.123)

pip index  versions backtrader
WARNING: pip index is currently an experimental command. It may be removed/changed in a future release without prior warning.
backtrader (1.9.78.123)
Available versions: 1.9.78.123, 1.9.77.123, 1.9.76.123, 1.9.75.123, 1.9.74.123

2. 基本使用

（1）初始设置现金

cerebro.broker.setcash(100000.0)

from __future__ import (absolute_import, division, print_function,unicode_literals)import backtrader as btif __name__ == '__main__':cerebro = bt.Cerebro()cerebro.broker.setcash(100000.0)print('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())cerebro.run()print('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())

因为没有任何策略，所以金额没有变化：

Starting Portfolio Value: 100000.00
Final Portfolio Value: 100000.00

（2）加载数据

示例使用的是Oracle的记录，实际使用，调整到国内数据。

from __future__ import (absolute_import, division, print_function,unicode_literals)import datetime  # For datetime objects
import os.path  # To manage paths
import sys  # To find out the script name (in argv[0])# Import the backtrader platform
import backtrader as btif __name__ == '__main__':# Create a cerebro entitycerebro = bt.Cerebro()# Datas are in a subfolder of the samples. Need to find where the script is# because it could have been called from anywheremodpath = os.path.dirname(os.path.abspath(sys.argv[0]))datapath = os.path.join(modpath, '../../datas/orcl-1995-2014.txt')# Create a Data Feeddata = bt.feeds.YahooFinanceCSVData(dataname=datapath,# Do not pass values before this datefromdate=datetime.datetime(2000, 1, 1),# Do not pass values after this datetodate=datetime.datetime(2000, 12, 31),reverse=False)# Add the Data Feed to Cerebrocerebro.adddata(data)# Set our desired cash startcerebro.broker.setcash(100000.0)# Print out the starting conditionsprint('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())# Run over everythingcerebro.run()# Print out the final resultprint('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())

编写一个从数据库中取数据的函数使用：
注意：数据库中交易日期是date ，backtrader的数据集要求是datetime ，必须做好转换才能载入数据。

from sqlalchemy import create_engine
def get_code (stock_code):engine_ts = create_engine(connect parameter) # 执行sql操作sql = "select * from ts_stock t where t.stock_code=" + stock_code + ";"#stock_data = pd.read_sql(sql, con=engine_ts,index_col="date")  #因为BackTrader日期类型必须是datetime ,从数据库中读取的日期类型是date 。# 读数据，先不设置索引stock_data = pd.read_sql(sql, con=engine_ts) # ,index_col="date"# 增加一列，select 字段名是date，赋值到trade_date，同时转datetime类型stock_data['trade_date'] = pd.to_datetime(stock_data['date'], format='%Y%m%d %H:%M:%S')# 删除原来的date列stock_data.drop(columns=['date'])# 新datetime列作为索引列stock_data.set_index(['trade_date'], inplace=True)# 索引列改名stock_data.index.name='date'# 按backtrader 格式要求，第7列openinterest ，也可以不用# stock_data['openinterest'] = 0data = stock_data.sort_index(ascending=True)engine_ts.dispose()return(data)if __name__ == '__main__':# Create a cerebro entitycerebro = bt.Cerebro()stock_hfq_df = get_code('000858') #起止时间start_date = datetime.datetime(2015, 1, 1)  # 回测开始时间end_date = datetime.datetime(2019, 12, 31)  # 回测结束时间data = bt.feeds.PandasData(dataname=stock_hfq_df, fromdate=start_date, todate=end_date)  # 加载数据# Add the Data Feed to Cerebrocerebro.adddata(data)# Add the Data Feed to Cerebrocerebro.adddata(data)# Set our desired cash startcerebro.broker.setcash(100000.0)# Print out the starting conditionsprint('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())# Run over everythingcerebro.run()# Print out the final resultprint('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())    

（3）第一个策略 买入

在init方法中，可以使用载入的数据集，第一个数据是列表 self.datas[0] ，最后一个是 self.datas[-1] 。
self.dataclose=self.datas[0]。赋值close的引用，以后只需要一个间接引用dataclose ，就可以访问收盘值。
策略next方法将在系统时钟的每个bar上调用（self.datas[0]），直到符合策略条件，比如指标值设置，才能开始产生输出。
策略：
连续下跌三天，开始买入。
策略实施在next（）方法中。

## 3.第一个策略
from __future__ import (absolute_import, division, print_function,unicode_literals)import datetime  # For datetime objects
import os.path  # To manage paths
import sys  # To find out the script name (in argv[0])# Import the backtrader platform
import backtrader as bt# Create a Stratey
class TestStrategy(bt.Strategy):def log(self, txt, dt=None):''' Logging function for this strategy'''dt = dt or self.datas[0].datetime.date(0)print('%s, %s' % (dt.isoformat(), txt))def __init__(self):# Keep a reference to the "close" line in the data[0] dataseriesself.dataclose = self.datas[0].closedef next(self):# Simply log the closing price of the series from the referenceself.log('Close, %.2f' % self.dataclose[0])if __name__ == '__main__':# Create a cerebro entity# delete log filelog_file = './bt_log.txt'delete_file(log_file)cerebro = bt.Cerebro()# Add a strategycerebro.addstrategy(TestStrategy)# 五粮液测试stock_hfq_df = get_code('000858') start_date = datetime.datetime(2015, 1, 1)  # 回测开始时间end_date = datetime.datetime(2019, 12, 31)  # 回测结束时间data = bt.feeds.PandasData(dataname=stock_hfq_df, fromdate=start_date, todate=end_date)  # 加载数据# Add the Data Feed to Cerebrocerebro.adddata(data)# Set our desired cash startcerebro.broker.setcash(100000.0)# Print out the starting conditionsprint('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())# Run over everythingcerebro.run()# Print out the final resultprint('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())

调整：
输出都是close数据，数据显示比较多，都放到log文件中。 日志路径：

log_file = ‘./bt_log.txt’

修改TestStrategy 中的log方法，日志写入文件，便于查询。后不赘述。

## 3.第一个策略
from __future__ import (absolute_import, division, print_function,unicode_literals)import datetime  # For datetime objects
import os.path  # To manage paths
import sys  # To find out the script name (in argv[0])# Import the backtrader platform
import backtrader as bt
import os# delete log file
def delete_file(filename):# if log file exist if os.path.exists(filename):os.remove(filename)# Create a Stratey
class TestStrategy(bt.Strategy):def log(self, txt, dt=None):''' Logging function for this strategy'''dt = dt or self.datas[0].datetime.date(0)#print('%s, %s' % (dt.isoformat(), txt))with open(log_file, 'a') as file:file.write('%s, %s' % (dt.isoformat(), txt))file.write('\n')def __init__(self):# Keep a reference to the "close" line in the data[0] dataseriesself.dataclose = self.datas[0].closedef next(self):# Simply log the closing price of the series from the referenceself.log('Close, %.2f' % self.dataclose[0])if __name__ == '__main__':# delete log filelog_file = './bt_log.txt'delete_file(log_file)# Create a cerebro entitycerebro = bt.Cerebro()# Add a strategycerebro.addstrategy(TestStrategy)stock_hfq_df = get_code('000858') start_date = datetime.datetime(2015, 1, 1)  # 回测开始时间end_date = datetime.datetime(2019, 12, 31)  # 回测结束时间data = bt.feeds.PandasData(dataname=stock_hfq_df, fromdate=start_date, todate=end_date)  # 加载数据# Add the Data Feed to Cerebrocerebro.adddata(data)# Set our desired cash startcerebro.broker.setcash(100000.0)# Print out the starting conditionsprint('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())# Run over everythingcerebro.run()# Print out the final resultprint('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())

执行后，没有交易过程记录，都在日志文件中显示：

Starting Portfolio Value: 100000.00
Final Portfolio Value: 100000.00

再增加策略中的逻辑：
策略：连续三天下跌，开始买入操作

# Create a Stratey
class TestStrategy(bt.Strategy):def log(self, txt, dt=None):''' Logging function for this strategy'''dt = dt or self.datas[0].datetime.date(0)#print('%s, %s' % (dt.isoformat(), txt))with open(log_file, 'a') as file:file.write('%s, %s' % (dt.isoformat(), txt))file.write('\n')def __init__(self):# Keep a reference to the "close" line in the data[0] dataseriesself.dataclose = self.datas[0].close#Open, High, Low, Close, Volume, OpenInterestself.dataclose = self.datas[0].closeself.dataopen = self.datas[0].openself.datahigh = self.datas[0].highself.datalow = self.datas[0].lowself.datavol = self.datas[0].volumedef next(self):# Simply log the closing price of the series from the referenceself.log('Close, %.2f' % self.dataclose[0])if self.dataclose[0] < self.dataclose[-1]:# current close less than previous closeif self.dataclose[-1] < self.dataclose[-2]:# previous close less than the previous close# BUY, BUY, BUY!!! (with all possible default parameters)self.log('BUY CREATE, %.2f' % self.dataclose[0])self.buy()

说明：

• self.datas[0] 就是购买的股票。
• 默认购买单位是1，每次买1股 。position
  sizer属性来记录，缺省值为1，就是每一次操作只买卖1股。当前order订单执行的时候，采用的价格是触发购买条件第二天的开盘价。

2018-01-02, Close, 80.58
2018-01-03, Close, 80.90
2018-01-04, Close, 82.99
2018-01-05, Close, 82.68
2018-01-08, Close, 82.20
2018-01-08, BUY CREATE, 82.20
2018-01-09, Close, 86.10
2018-01-10, Close, 88.90

5号第一天下跌，8日第二天连续下跌，触发购买信号，购买价格就是8号的收盘价，就是9日的开盘价。

• 当前order执行的时候，没有收佣金。佣金如何设置后续还会说明。

可以看Strategy类有什么方法、属性：

method = ""
for i in dir(bt.Strategy):if i[:1] != '_' :method += i + ','
print(method)   

方法和属性：

IndType,ObsType,PriceClose,PriceDateTime,PriceHigh,PriceLow,PriceOpen,PriceOpenInteres,PriceVolume,StratType,add_timer,addindicator,addminperiod,advance,alias,aliased,array,backwards,bind2line,bind2lines,bindlines,buy,buy_bracket,cancel,clear,close,csv,extend,forward,frompackages,getdatabyname,getdatanames,getindicators,getindicators_lines,getobservers,getposition,getpositionbyname,getpositions,getpositionsbyname,getsizer,getsizing,getwriterheaders,getwriterinfo,getwritervalues,home,incminperiod,linealias,lines,minbuffer,next,next_open,nextstart,nextstart_open,notify_cashvalue,notify_data,notify_fund,notify_order,notify_store,notify_timer,notify_trade,once,oncestart,order_target_percent,order_target_size,order_target_value,packages,params,plotinfo,plotlabel,plotlines,position,positionbyname,positions,positionsbyname,prenext,prenext_open,preonce,qbuffer,reset,rewind,sell,sell_bracket,set_tradehistory,setminperiod,setsizer,sizer,start,stop,updateminperiod,

（4）还要卖出

• Strategy对象提供了对默认数据的位置属性的访问
• 方法buy和sell 都创建（尚未执行）执行订单
• Strategy订单状态的变化将通过notify 方法调用
• 卖出策略是：持仓5天，在第6天卖出

# 4.不但买入，还要卖出# Create a Stratey
class TestStrategy(bt.Strategy):def log(self, txt, dt=None):''' Logging function for this strategy'''dt = dt or self.datas[0].datetime.date(0)#print('%s, %s' % (dt.isoformat(), txt))with open(log_file, 'a') as file:file.write('%s, %s' % (dt.isoformat(), txt))file.write('\n')def __init__(self):# Keep a reference to the "close" line in the data[0] dataseriesself.dataclose = self.datas[0].close#Open, High, Low, Close, Volume, OpenInterestself.dataclose = self.datas[0].closeself.dataopen = self.datas[0].openself.datahigh = self.datas[0].highself.datalow = self.datas[0].lowself.datavol = self.datas[0].volume# To keep track of pending ordersself.order = None                def notify_order(self, order):# 买卖订单的状态：提交和接受，通过broker控制    if order.status in [order.Submitted, order.Accepted]:# Buy/Sell order submitted/accepted to/by broker - Nothing to doreturn# Check if an order has been completed# Attention: broker could reject order if not enough cash# broker如果资金不足将reject订单#订单状态是完成if order.status in [order.Completed]:#判断是买单，写日志if order.isbuy():self.log('BUY EXECUTED, %.2f' % order.executed.price)#判读是卖单，写日志elif order.issell():self.log('SELL EXECUTED, %.2f' % order.executed.price)#定义bar_executed 变量，记录处理bar的数量#len：返回当前系统已经处理的数据（bars）。这个和python标准的len定义差异。self.bar_executed = len(self)self.bar_buffer =  lenbuf(self)elif order.status in [order.Canceled, order.Margin, order.Rejected]:self.log('Order Canceled/Margin/Rejected')# Write down: no pending orderself.order = Nonedef next(self):# Simply log the closing price of the series from the referenceself.log('Close, %.2f' % self.dataclose[0])# Check if an order is pending ... if yes, we cannot send a 2nd oneif self.order:return# Check if we are in the marketif not self.position:# Not yet ... we MIGHT BUY if ...#连续两天下跌，开始买入if self.dataclose[0] < self.dataclose[-1]:# current close less than previous closeif self.dataclose[-1] < self.dataclose[-2]:# previous close less than the previous close# BUY, BUY, BUY!!! (with default parameters)self.log('BUY CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.buy()else:# Already in the market ... we might sellif len(self) >= (self.bar_executed + 5):# SELL, SELL, SELL!!! (with all possible default parameters)self.log('SELL CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.sell()if __name__ == '__main__':# delete log filelog_file = './bt_log.txt'delete_file(log_file)# Create a cerebro entitycerebro = bt.Cerebro()# Add a strategycerebro.addstrategy(TestStrategy)stock_hfq_df = get_code('000858') start_date = datetime.datetime(2015, 1, 1)  # 回测开始时间end_date = datetime.datetime(2019, 12, 31)  # 回测结束时间data = bt.feeds.PandasData(dataname=stock_hfq_df, fromdate=start_date, todate=end_date)  # 加载数据# Add the Data Feed to Cerebrocerebro.adddata(data)# Set our desired cash startcerebro.broker.setcash(100000.0)# Print out the starting conditionsprint('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())# Run over everythingcerebro.run()# Print out the final resultprint('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())

执行流程，每次买卖数量都是1股：
5日下跌，6日下跌，创建买单，9日执行买单，是9日的开盘价。
买单时，处理的是6个bar 。
从10日开始，到16日是持仓第5天，创建卖单，17日，开盘卖出。
执行结果：

2018-01-02, Close, 80.58
2018-01-03, Close, 80.90
2018-01-04, Close, 82.99
2018-01-05, Close, 82.68
2018-01-08, Close, 82.20
2018-01-08, BUY CREATE, 82.20
2018-01-09, BUY EXECUTED, 82.40
2018-01-09, Bar executed :6
2018-01-09, Close, 86.10
2018-01-10, Close, 88.90
2018-01-11, Close, 87.96
2018-01-12, Close, 91.37
2018-01-15, Close, 91.75
2018-01-16, Close, 90.82
2018-01-16, SELL CREATE, 90.82
2018-01-17, SELL EXECUTED, 90.30
2018-01-17, Bar executed :12
... ...
... ...
... ...

订单的状态是通过Order对象的status属性来表示的。status属性可以是以下几个值之一：

• Order.Submitted：订单已提交，但尚未成交。
• Order.Accepted：订单已被接受，正在等待成交。
• Order.Completed：订单已完全成交。
• Order.Canceled：订单已取消。
• Order.Margin：订单由于保证金不足而被拒绝。
• Order.Rejected：订单被拒绝，原因可能是无效的价格、数量等。

（5）考虑券商佣金

在main函数中增加

    # Set the commission - 0.1% ... divide by 100 to remove the %cerebro.broker.setcommission(commission=0.001)

修改后的策略：
增加 方法 def notify_trade(self, trade):
用于计算毛利和纯利 ，通过trade对象计算。
查看在backtrader 目录下的trade.py源码：
定义属性：
pnl定义毛利，pnlcomm定义毛利-佣金

Attributes:- ``status`` (``dict`` with '.' notation): Holds the resulting status ofan update event and has the following sub-attributes- ``status`` (``int``): Trade status- ``dt`` (``float``): float coded datetime- ``barlen`` (``int``): number of bars the trade has been active- ``size`` (``int``): current size of the Trade- ``price`` (``float``): current price of the Trade- ``value`` (``float``): current monetary value of the Trade- ``pnl`` (``float``): current profit and loss of the Trade- ``pnlcomm`` (``float``): current profit and loss minus commission- ``event`` (``dict`` with '.' notation): Holds the event update- parameters- ``order`` (``object``): the order which initiated the``update``- ``size`` (``int``): size of the update- ``price`` (``float``):price of the update- ``commission`` (``float``): price of the update'''

#5. 考虑佣金
# Create a Stratey
class TestStrategy(bt.Strategy):def log(self, txt, dt=None):''' Logging function for this strategy'''dt = dt or self.datas[0].datetime.date(0)#print('%s, %s' % (dt.isoformat(), txt))with open(log_file, 'a') as file:file.write('%s, %s' % (dt.isoformat(), txt))file.write('\n')def __init__(self):# Keep a reference to the "close" line in the data[0] dataseriesself.dataclose = self.datas[0].close#Open, High, Low, Close, Volume, OpenInterestself.dataclose = self.datas[0].closeself.dataopen = self.datas[0].openself.datahigh = self.datas[0].highself.datalow = self.datas[0].lowself.datavol = self.datas[0].volume# To keep track of pending ordersself.order = None                # To keep track of pending orders and buy price/commissionself.order = Noneself.buyprice = Noneself.buycomm = None# 统计毛利和净利润self.gross = 0.0self.net = 0.0def notify_order(self, order):# 买卖订单的状态：提交和接受，通过broker控制    if order.status in [order.Submitted, order.Accepted]:# Buy/Sell order submitted/accepted to/by broker - Nothing to doreturn# Check if an order has been completed# Attention: broker could reject order if not enough cash# broker如果资金不足将reject订单#订单状态是完成if order.status in [order.Completed]:#判断是买单，写日志if order.isbuy():self.log('BUY EXECUTED, Price: %.2f, Cost: %.2f, Comm %.2f' %(order.executed.price,order.executed.value,order.executed.comm))self.buyprice = order.executed.priceself.buycomm = order.executed.comm#判读是卖单，写日志elif order.issell():self.log('SELL EXECUTED, Price: %.2f, Cost: %.2f, Comm %.2f' %(order.executed.price,order.executed.value,order.executed.comm))#定义bar_executed 变量，记录处理bar的数量#len：返回当前系统已经处理的数据（bars）。这个和python标准的len定义差异。self.bar_executed = len(self)#日志显示处理的bar数量，逐渐递增。strlog = 'Bar executed :' + str(self.bar_executed)self.log(strlog)# 订单取消、保证金不足、退回elif order.status in [order.Canceled, order.Margin, order.Rejected]:self.log('Order Canceled/Margin/Rejected')# Write down: no pending order# 处理完订单，无挂起订单，重置订单为空self.order = Nonedef notify_trade(self, trade):# 如果不是平仓，返回if not trade.isclosed:return# 平仓计算成本和利润self.log('OPERATION PROFIT, GROSS %.2f, NET %.2f' %(trade.pnl, trade.pnlcomm))# 累计毛利和净利润self.gross += trade.pnlself.net =+ trade.pnlcommself.log ('Accumulated profit,GROSS  %.2f, NET %.2f' % (self.gross,self.net))def next(self):# Simply log the closing price of the series from the referenceself.log('Close, %.2f' % self.dataclose[0])# Check if an order is pending ... if yes, we cannot send a 2nd oneif self.order:return# Check if we are in the marketif not self.position:# Not yet ... we MIGHT BUY if ...#连续两天下跌，开始买入if self.dataclose[0] < self.dataclose[-1]:# current close less than previous closeif self.dataclose[-1] < self.dataclose[-2]:# previous close less than the previous close# BUY, BUY, BUY!!! (with default parameters)self.log('BUY CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.buy()else:# Already in the market ... we might sell# 持仓5天if len(self) >= (self.bar_executed + 5):# SELL, SELL, SELL!!! (with all possible default parameters)self.log('SELL CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.sell()

执行结果：

Starting Portfolio Value: 100000.00
Final Portfolio Value: 100040.35

日志内容：

2018-01-02, Close, 80.58
2018-01-03, Close, 80.90
2018-01-04, Close, 82.99
2018-01-05, Close, 82.68
2018-01-08, Close, 82.20
2018-01-08, BUY CREATE, 82.20
2018-01-09, BUY EXECUTED, Price: 82.40, Cost: 82.40, Comm 0.01
2018-01-09, Bar executed :6
2018-01-09, Close, 86.10
2018-01-10, Close, 88.90
2018-01-11, Close, 87.96
2018-01-12, Close, 91.37
2018-01-15, Close, 91.75
2018-01-16, Close, 90.82
2018-01-16, SELL CREATE, 90.82
2018-01-17, SELL EXECUTED, Price: 90.30, Cost: 82.40, Comm 0.01
2018-01-17, Bar executed :12
2018-01-17, OPERATION PROFIT, GROSS 7.90, NET 7.88
2018-01-17, Accumulated profit,GROSS  7.90, NET 7.88
2018-01-17, Close, 86.01
... ... 
... ... 
2019-12-12, BUY CREATE, 127.78
2019-12-13, BUY EXECUTED, Price: 128.58, Cost: 128.58, Comm 0.01
2019-12-13, Bar executed :475
2019-12-13, Close, 129.52
2019-12-16, Close, 128.83
2019-12-17, Close, 130.25
2019-12-18, Close, 130.94
2019-12-19, Close, 129.86
2019-12-20, Close, 129.10
2019-12-20, SELL CREATE, 129.10
2019-12-23, SELL EXECUTED, Price: 127.50, Cost: 128.58, Comm 0.01
2019-12-23, Bar executed :481
2019-12-23, OPERATION PROFIT, GROSS -1.08, NET -1.11
2019-12-23, Accumulated profit,GROSS  36.59, NET -1.11
2019-12-23, Close, 128.14
2019-12-23, BUY CREATE, 128.14
2019-12-24, BUY EXECUTED, Price: 128.44, Cost: 128.44, Comm 0.01
2019-12-24, Bar executed :482
2019-12-24, Close, 128.70
2019-12-25, Close, 128.10
2019-12-26, Close, 128.15
2019-12-27, Close, 129.00
2019-12-30, Close, 132.82
2019-12-31, Close, 133.01
2019-12-31, SELL CREATE, 133.01

可以看出

2018-01-17, SELL EXECUTED, Price: 90.30, Cost: 82.40, Comm 0.01

盈利：90.30 - 82.40 = 7.90元，佣金0.01

2018-01-17, OPERATION PROFIT, GROSS 7.90, NET 7.88

毛利：7.90元 ，买卖两次，佣金0.02
净利润：7.90 - 0.02 = 7.88 元

（6）优化策略参数

在main函数中增加，每次购买10股，默认是1股。

# Add a FixedSize sizer according to the stake
cerebro.addsizer(bt.sizers.FixedSize, stake=10)

在TestStrategy(bt.Strategy) 类定义中，增加参数。

params = (('exitbars', 5),
)

用于持仓天数，默认是5天。
修改后代码：

#6. 优化参数
# Create a Stratey
class TestStrategy(bt.Strategy):params = (('exitbars', 5),)def log(self, txt, dt=None):''' Logging function for this strategy'''dt = dt or self.datas[0].datetime.date(0)#print('%s, %s' % (dt.isoformat(), txt))with open(log_file, 'a') as file:file.write('%s, %s' % (dt.isoformat(), txt))file.write('\n')def __init__(self):# Keep a reference to the "close" line in the data[0] dataseriesself.dataclose = self.datas[0].close#Open, High, Low, Close, Volume, OpenInterestself.dataclose = self.datas[0].closeself.dataopen = self.datas[0].openself.datahigh = self.datas[0].highself.datalow = self.datas[0].lowself.datavol = self.datas[0].volume# To keep track of pending ordersself.order = None                # To keep track of pending orders and buy price/commissionself.order = Noneself.buyprice = Noneself.buycomm = None# 统计毛利和净利润self.gross = 0.0self.net = 0.0def notify_order(self, order):# 买卖订单的状态：提交和接受，通过broker控制    if order.status in [order.Submitted, order.Accepted]:# Buy/Sell order submitted/accepted to/by broker - Nothing to doreturn# Check if an order has been completed# Attention: broker could reject order if not enough cash# broker如果资金不足将reject订单#订单状态是完成if order.status in [order.Completed]:#判断是买单，写日志if order.isbuy():self.log('BUY EXECUTED, Price: %.2f, Cost: %.2f, Comm %.2f' %(order.executed.price,order.executed.value,order.executed.comm))self.buyprice = order.executed.priceself.buycomm = order.executed.comm#判读是卖单，写日志elif order.issell():self.log('SELL EXECUTED, Price: %.2f, Cost: %.2f, Comm %.2f' %(order.executed.price,order.executed.value,order.executed.comm))#定义bar_executed 变量，记录处理bar的数量#len：返回当前系统已经处理的数据（bars）。这个和python标准的len定义差异。self.bar_executed = len(self)#日志显示处理的bar数量，逐渐递增。strlog = 'Bar executed :' + str(self.bar_executed)self.log(strlog)# 订单取消、保证金不足、退回elif order.status in [order.Canceled, order.Margin, order.Rejected]:self.log('Order Canceled/Margin/Rejected')# Write down: no pending order# 处理完订单，无挂起订单，重置订单为空self.order = Nonedef notify_trade(self, trade):# 如果不是平仓，返回if not trade.isclosed:return# 平仓计算成本和利润self.log('OPERATION PROFIT, GROSS %.2f, NET %.2f' %(trade.pnl, trade.pnlcomm))# 累计毛利和净利润self.gross += trade.pnlself.net =+ trade.pnlcommself.log ('Accumulated profit,GROSS  %.2f, NET %.2f' % (self.gross,self.net))def next(self):# Simply log the closing price of the series from the referenceself.log('Close, %.2f' % self.dataclose[0])# Check if an order is pending ... if yes, we cannot send a 2nd oneif self.order:return# Check if we are in the marketif not self.position:# Not yet ... we MIGHT BUY if ...#连续两天下跌，开始买入if self.dataclose[0] < self.dataclose[-1]:# current close less than previous closeif self.dataclose[-1] < self.dataclose[-2]:# previous close less than the previous close# BUY, BUY, BUY!!! (with default parameters)self.log('BUY CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.buy()else:# Already in the market ... we might sell# 持仓5天if len(self) >= (self.bar_executed + self.params.exitbars):# SELL, SELL, SELL!!! (with all possible default parameters)self.log('SELL CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.sell()if __name__ == '__main__':# delete log filelog_file = './bt_log.txt'delete_file(log_file)# Create a cerebro entitycerebro = bt.Cerebro()# Add a strategycerebro.addstrategy(TestStrategy)stock_hfq_df = get_code('111969') start_date = datetime.datetime(2015, 1, 1)  # 回测开始时间end_date = datetime.datetime(2019, 12, 31)  # 回测结束时间data = bt.feeds.PandasData(dataname=stock_hfq_df, fromdate=start_date, todate=end_date)  # 加载数据# Add the Data Feed to Cerebrocerebro.adddata(data)# Set our desired cash startcerebro.broker.setcash(100000.0)# Set the commission - 0.1% ... divide by 100 to remove the %# 按万一的佣金 ，买卖操作都要扣除cerebro.broker.setcommission(commission=0.0001)# Add a FixedSize sizer according to the stakecerebro.addsizer(bt.sizers.FixedSize, stake=10)# Print out the starting conditionsprint('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())# Run over everythingcerebro.run()# Print out the final resultprint('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())

执行输出结果：

Starting Portfolio Value: 100000.00
Final Portfolio Value: 100403.51

由于每次购买10股，盈利增加。
日志：

2018-01-02, Close, 80.58
2018-01-03, Close, 80.90
2018-01-04, Close, 82.99
2018-01-05, Close, 82.68
2018-01-08, Close, 82.20
2018-01-08, BUY CREATE, 82.20
2018-01-09, BUY EXECUTED, Price: 82.40, Cost: 824.00, Comm 0.08
2018-01-09, Bar executed :6
2018-01-09, Close, 86.10
2018-01-10, Close, 88.90
2018-01-11, Close, 87.96
2018-01-12, Close, 91.37
2018-01-15, Close, 91.75
2018-01-16, Close, 90.82
2018-01-16, SELL CREATE, 90.82
2018-01-17, SELL EXECUTED, Price: 90.30, Cost: 824.00, Comm 0.09
2018-01-17, Bar executed :12
2018-01-17, OPERATION PROFIT, GROSS 79.00, NET 78.83
2018-01-17, Accumulated profit,GROSS  79.00, NET 78.83
2018-01-17, Close, 86.01

一次买卖，平仓后，净利润和毛利都增加。

（7）增加指示器indicator

上面的例子，买入是连跌三天，卖出是持仓5天。策略简单粗暴。
通过indicator的均线，做买入卖出指标，更加合理一点。

• 如果收盘价高于平均值，则买入
• 如果收盘价小于平均值，则卖出
• 只允许1个交易活动操作，买一单，卖出一单的模式

修改内容：

• 策略增加参数，SMA周期参数，默认设置30日 。

params = (         ('maperiod', 30),('exitbars', 5),    )

• 在next方法中，调整买卖的判断。

#7. 使用指示器
# Create a Stratey
class TestStrategy(bt.Strategy):params = (('maperiod', 30),('exitbars', 5),)def log(self, txt, dt=None):''' Logging function for this strategy'''dt = dt or self.datas[0].datetime.date(0)#print('%s, %s' % (dt.isoformat(), txt))with open(log_file, 'a') as file:file.write('%s, %s' % (dt.isoformat(), txt))file.write('\n')def __init__(self):# Keep a reference to the "close" line in the data[0] dataseriesself.dataclose = self.datas[0].close#Open, High, Low, Close, Volume, OpenInterestself.dataclose = self.datas[0].closeself.dataopen = self.datas[0].openself.datahigh = self.datas[0].highself.datalow = self.datas[0].lowself.datavol = self.datas[0].volume# To keep track of pending ordersself.order = None                # To keep track of pending orders and buy price/commissionself.order = Noneself.buyprice = Noneself.buycomm = None# 统计毛利和净利润self.gross = 0.0self.net = 0.0# Add a MovingAverageSimple indicator# 使用简单移动平均线确定买入和卖出操作self.sma = bt.indicators.SimpleMovingAverage(self.datas[0], period=self.params.maperiod)def notify_order(self, order):# 买卖订单的状态：提交和接受，通过broker控制    if order.status in [order.Submitted, order.Accepted]:# Buy/Sell order submitted/accepted to/by broker - Nothing to doreturn# Check if an order has been completed# Attention: broker could reject order if not enough cash# broker如果资金不足将reject订单#订单状态是完成if order.status in [order.Completed]:#判断是买单，写日志if order.isbuy():self.log('BUY EXECUTED, Price: %.2f, Cost: %.2f, Comm %.2f' %(order.executed.price,order.executed.value,order.executed.comm))self.buyprice = order.executed.priceself.buycomm = order.executed.comm#判读是卖单，写日志elif order.issell():self.log('SELL EXECUTED, Price: %.2f, Cost: %.2f, Comm %.2f' %(order.executed.price,order.executed.value,order.executed.comm))#定义bar_executed 变量，记录处理bar的数量#len：返回当前系统已经处理的数据（bars）。这个和python标准的len定义差异。self.bar_executed = len(self)#日志显示处理的bar数量，逐渐递增。strlog = 'Bar executed :' + str(self.bar_executed)self.log(strlog)# 订单取消、保证金不足、退回elif order.status in [order.Canceled, order.Margin, order.Rejected]:self.log('Order Canceled/Margin/Rejected')# Write down: no pending order# 处理完订单，无挂起订单，重置订单为空self.order = Nonedef notify_trade(self, trade):# 如果不是平仓，返回if not trade.isclosed:return# 平仓计算成本和利润self.log('OPERATION PROFIT, GROSS %.2f, NET %.2f' %(trade.pnl, trade.pnlcomm))# 累计毛利和净利润self.gross += trade.pnlself.net =+ trade.pnlcommself.log ('Accumulated profit,GROSS  %.2f, NET %.2f' % (self.gross,self.net))def next(self):# Simply log the closing price of the series from the referenceself.log('Close, %.2f' % self.dataclose[0])# Check if an order is pending ... if yes, we cannot send a 2nd oneif self.order:return# Check if we are in the marketif not self.position:# Not yet ... we MIGHT BUY if ...#收盘穿过简单平均移动线，买入if self.dataclose[0] > self.sma[0]:# current close less than previous closeif self.dataclose[-1] < self.dataclose[-2]:# previous close less than the previous close# BUY, BUY, BUY!!! (with default parameters)self.log('BUY CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.buy()else:# Already in the market ... we might sell#收盘穿过简单平均移动线，买入if self.dataclose[0] < self.sma[0]:# SELL, SELL, SELL!!! (with all possible default parameters)self.log('SELL CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.sell()if __name__ == '__main__':# delete log filelog_file = './bt_log.txt'delete_file(log_file)# Create a cerebro entitycerebro = bt.Cerebro()# Add a strategycerebro.addstrategy(TestStrategy)stock_hfq_df = get_code('111969') start_date = datetime.datetime(2015, 1, 1)  # 回测开始时间end_date = datetime.datetime(2019, 12, 31)  # 回测结束时间data = bt.feeds.PandasData(dataname=stock_hfq_df, fromdate=start_date, todate=end_date)  # 加载数据# Add the Data Feed to Cerebrocerebro.adddata(data)# Set our desired cash startcerebro.broker.setcash(100000.0)# Set the commission - 0.1% ... divide by 100 to remove the %# 按万一的佣金 ，买卖操作都要扣除cerebro.broker.setcommission(commission=0.0001)# Add a FixedSize sizer according to the stakecerebro.addsizer(bt.sizers.FixedSize, stake=10)# Print out the starting conditionsprint('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())# Run over everythingcerebro.run()# Print out the final resultprint('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())

执行结果：

Starting Portfolio Value: 100000.00
Final Portfolio Value: 100522.68

比简单判断下跌买入，持仓5天卖出的策略，收益高119.17。

Starting Portfolio Value: 100000.00
Final Portfolio Value: 100403.51

（8）可视化

内置的plot方法，参数如下：

def plot(self, plotter=None, numfigs=1, iplot=True, start=None, end=None,width=16, height=9, dpi=300, tight=True, use=None, **kwargs):

说明：如果在jupyter中直接绘图，报错

cerebro.plot() 

报错：Javascript Error: IPython is not defined
解决方法：
%matplotlib inline
调用绘图：

cerebro.plot(iplot=False)

在jupyter中可以绘图。

在init方法中增加绘图指示器指标：

        # Indicators for the plotting showbt.indicators.ExponentialMovingAverage(self.datas[0], period=25)bt.indicators.WeightedMovingAverage(self.datas[0], period=25,subplot=True)bt.indicators.StochasticSlow(self.datas[0])bt.indicators.MACDHisto(self.datas[0])rsi = bt.indicators.RSI(self.datas[0])bt.indicators.SmoothedMovingAverage(rsi, period=10)bt.indicators.ATR(self.datas[0], plot=False)

#8. 可视化
# Create a Stratey
class TestStrategy(bt.Strategy):params = (('maperiod', 30),('exitbars', 5),)def log(self, txt, dt=None):''' Logging function for this strategy'''dt = dt or self.datas[0].datetime.date(0)#print('%s, %s' % (dt.isoformat(), txt))with open(log_file, 'a') as file:file.write('%s, %s' % (dt.isoformat(), txt))file.write('\n')def __init__(self):# Keep a reference to the "close" line in the data[0] dataseriesself.dataclose = self.datas[0].close#Open, High, Low, Close, Volume, OpenInterestself.dataclose = self.datas[0].closeself.dataopen = self.datas[0].openself.datahigh = self.datas[0].highself.datalow = self.datas[0].lowself.datavol = self.datas[0].volume# To keep track of pending ordersself.order = None                # To keep track of pending orders and buy price/commissionself.order = Noneself.buyprice = Noneself.buycomm = None# 统计毛利和净利润self.gross = 0.0self.net = 0.0# Add a MovingAverageSimple indicator# 使用简单移动平均线确定买入和卖出操作self.sma = bt.indicators.SimpleMovingAverage(self.datas[0], period=self.params.maperiod)# Indicators for the plotting showbt.indicators.ExponentialMovingAverage(self.datas[0], period=25)bt.indicators.WeightedMovingAverage(self.datas[0], period=25,subplot=True)bt.indicators.StochasticSlow(self.datas[0])bt.indicators.MACDHisto(self.datas[0])rsi = bt.indicators.RSI(self.datas[0])bt.indicators.SmoothedMovingAverage(rsi, period=10)bt.indicators.ATR(self.datas[0], plot=False)def notify_order(self, order):# 买卖订单的状态：提交和接受，通过broker控制    if order.status in [order.Submitted, order.Accepted]:# Buy/Sell order submitted/accepted to/by broker - Nothing to doreturn# Check if an order has been completed# Attention: broker could reject order if not enough cash# broker如果资金不足将reject订单#订单状态是完成if order.status in [order.Completed]:#判断是买单，写日志if order.isbuy():self.log('BUY EXECUTED, Price: %.2f, Cost: %.2f, Comm %.2f' %(order.executed.price,order.executed.value,order.executed.comm))self.buyprice = order.executed.priceself.buycomm = order.executed.comm#判读是卖单，写日志elif order.issell():self.log('SELL EXECUTED, Price: %.2f, Cost: %.2f, Comm %.2f' %(order.executed.price,order.executed.value,order.executed.comm))#定义bar_executed 变量，记录处理bar的数量#len：返回当前系统已经处理的数据（bars）。这个和python标准的len定义差异。self.bar_executed = len(self)#日志显示处理的bar数量，逐渐递增。strlog = 'Bar executed :' + str(self.bar_executed)self.log(strlog)# 订单取消、保证金不足、退回elif order.status in [order.Canceled, order.Margin, order.Rejected]:self.log('Order Canceled/Margin/Rejected')# Write down: no pending order# 处理完订单，无挂起订单，重置订单为空self.order = Nonedef notify_trade(self, trade):# 如果不是平仓，返回if not trade.isclosed:return# 平仓计算成本和利润self.log('OPERATION PROFIT, GROSS %.2f, NET %.2f' %(trade.pnl, trade.pnlcomm))# 累计毛利和净利润self.gross += trade.pnlself.net =+ trade.pnlcommself.log ('Accumulated profit,GROSS  %.2f, NET %.2f' % (self.gross,self.net))def next(self):# Simply log the closing price of the series from the referenceself.log('Close, %.2f' % self.dataclose[0])# Check if an order is pending ... if yes, we cannot send a 2nd oneif self.order:return# Check if we are in the marketif not self.position:# Not yet ... we MIGHT BUY if ...#收盘穿过简单平均移动线，买入if self.dataclose[0] > self.sma[0]:# current close less than previous closeif self.dataclose[-1] < self.dataclose[-2]:# previous close less than the previous close# BUY, BUY, BUY!!! (with default parameters)self.log('BUY CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.buy()else:# Already in the market ... we might sell#收盘穿过简单平均移动线，买入if self.dataclose[0] < self.sma[0]:# SELL, SELL, SELL!!! (with all possible default parameters)self.log('SELL CREATE, %.2f' % self.dataclose[0])# Keep track of the created order to avoid a 2nd orderself.order = self.sell()%matplotlib inline
if __name__ == '__main__':# delete log filelog_file = './bt_log.txt'delete_file(log_file)# Create a cerebro entitycerebro = bt.Cerebro()# Add a strategycerebro.addstrategy(TestStrategy)stock_hfq_df = get_code('111969') start_date = datetime.datetime(2015, 1, 1)  # 回测开始时间end_date = datetime.datetime(2019, 12, 31)  # 回测结束时间data = bt.feeds.PandasData(dataname=stock_hfq_df, fromdate=start_date, todate=end_date)  # 加载数据# Add the Data Feed to Cerebrocerebro.adddata(data)# Set our desired cash startcerebro.broker.setcash(100000.0)# Set the commission - 0.1% ... divide by 100 to remove the %# 按万一的佣金 ，买卖操作都要扣除cerebro.broker.setcommission(commission=0.0001)# Add a FixedSize sizer according to the stakecerebro.addsizer(bt.sizers.FixedSize, stake=10)# Print out the starting conditionsprint('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())# Run over everythingcerebro.run()# Print out the final resultprint('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())cerebro.plot(iplot=False)#cerebro.plot() # Javascript Error: IPython is not defined

绘图结果如下：