chardet：charset detection

一旦自动检测出编码，就可以解码了。

八种文件打开方式

• w：一旦打开文件，文件内容就清空了
• r：只读方式打开
• a：追加方式打开
• r+：先读后写
  以上四种打开方式加上b，表示二进制方式。

str.decoding(encoding,error='strice')

解码时遇到错误有三种处理方式

• strict：默认，抛出异常
• replace：替换
• ignore：不管

utf.py

import chardetimport osimport sysdef utf(path, recursive=False):    print(path)    if os.path.isfile(path):        with open(path, 'rb+') as f:            content = f.read()            encoding = chardet.detect(content)['encoding']            if encoding != 'utf-8':                s = content.decode(encoding, errors='ignore')                f.write(s.encode('utf8', errors='ignore'))    else:        for i in os.listdir(path):            now_path = os.path.join(path, i)            if os.path.isdir(now_path) and recursive:                utf(now_path, recursive)            elif os.path.splitext(i)[1] == '.txt':                utf(now_path)usage = """        python utf haha.txt #更改单文件        python utf haha #更改文件夹下的全部文本文件(.txt)        python utf haha recursive #递归更改文件夹下的全部文本文件        """if __name__ == '__main__':    # sys.argv = ['main', r'C:\Users\weidiao\Desktop\电子书', 'recursive']    if len(sys.argv) == 1:        print(usage)        exit()    if len(sys.argv) > 3:        print(usage)        print('too many argument')        exit()    path = sys.argv[1]    if not os.path.exists(sys.argv[1]):        print(usage)        print('no this file or folder')        exit()    recursive = (len(sys.argv) == 3 and sys.argv[2] == 'recursive')    utf(path, recursive)