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import os

def getBigFile(path, filesize):
    # 遍历指定目录及其子目录
    for dirpath, dirnames, filenames in os.walk(path):
        for filename in filenames:
            target_file = os.path.join(dirpath, filename)
            # 判断是否真的是文件
            if not os.path.isfile(target_file):
                continue
            size = os.path.getsize(target_file)
            if size > filesize:
                size = size//(1024*1024)   
                size = '{size}M'.format(size=size)
                print(target_file, size)

if __name__ == '__main__':
    getBigFile('C:\\', 300*1024*1024)