python 正则表达式删除注释

Question

我将如何编写一个正则表达式来删除所有以 # 开头并在行末尾停止的注释 - 但同时排除前两行

#!/usr/bin/python 

和

#-*- coding: utf-8 -*-

Answer 1

您可以通过解析 Python 代码来删除注释tokenize.generate_tokens。以下是文档中此示例的稍微修改版本：

import tokenize
import io
import sys
if sys.version_info[0] == 3:
    StringIO = io.StringIO
else:
    StringIO = io.BytesIO

def nocomment(s):
    result = []
    g = tokenize.generate_tokens(StringIO(s).readline)  
    for toknum, tokval, _, _, _  in g:
        # print(toknum,tokval)
        if toknum != tokenize.COMMENT:
            result.append((toknum, tokval))
    return tokenize.untokenize(result)

with open('script.py','r') as f:
    content=f.read()

print(nocomment(content))

例如：

如果 script.py 包含

def foo(): # Remove this comment
    ''' But do not remove this #1 docstring 
    '''
    # Another comment
    pass

那么输出nocomment是

def foo ():
    ''' But do not remove this #1 docstring 
    '''

    pass