Python开发IDE(Integrated Development Environment):
PyCharm、Eclipse
1.Python运算符
运算结果是值1.算术运算a = 10 * 10print(a)1002.赋值运算a = 11a = a + 1 或 a += 1print(a)12运算结果是布尔值1.比较运算a = 1 > 5print(a)False2.逻辑运算a = 1 > 6 or 1 == 1print(a)True3.成员运算a = "老土" in "疯狂坦克"print(a)False2.Python基本数据类型
数值型 int 所有功能都放在int里a1 = 123a1 = 456print(a1)456- int字符串转换为数字a = "123"print(type(a),a)str 123b = int(a)print(type(b),b)int 123num = "0011"v = int(num,base=16)print(v)- bit_length#当前数字的二进制，至少用n位表示r = age.bit_length()字符串 strs1 = "welcome"s2 = "hello"#首字母大写name = "ocean"v = name.capitalize()print(v)#所有字符转换为小写，casefold很厉害，很多位置的对相应转换小写v1 = name.casefold()print(v1)v2 = name.lower()print(v2)#设置宽度，并将内容居中10代表总长度*填充空白位置v3 = name.center(10,"中")print(v3）****中****#搜寻字符串中的关键字，计算子序列的出现次数name = "ocaenoceaneanaenn"v4 = name.count('ea')print(v4)2name = "ocaenoceaneanaenn"v5 = name.count('ea'，4,9)print(v5)1 #字符串开始、字符串结尾name = "ocean"v6 = name.endswith('oc')v7 = name.startswith('oc')print(v6)print(v7)FalseTrue#字符串由左向右，搜寻子序列之后，输出位置name = "oceanocean"v8 = name.find('ce')print(v8)#index找不到，报错name = "ocaenocaen"v9 = name.index(6)print(v9)#格式化，讲一个字符串中的占位符替换成指定的值name = 'i am {bb}, age{aa}'print(name)v10 = name.format(bb='ocean',aa=18)print(v10)#格式化，传入的值 {"bb":'ocean',"aa":18}name = 'i am {bb}, age{aa}'v11 = name.format(name='dd',a=1-)v12 = name.format_map({"bb":'ocean',"aa":18})#字符串中是否包含 字母或数字name = "123"v13 = name.isalnum()print(v13)
