Python报错IndentationError: unindent does not match any outer indentation level

　　IndentationError: unindent does not match any outer indentation level

　　应该是缩进问题，特别是把几个不同的源码拷到一块修改调式的时候容易遇到，因为两个人写的程序缩进可能不一样，有的是tab，有的是空格，这用肉眼很难察觉。把缩进都改为一种格式就可以了。

#!/usr/bin/env python3

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

from datetime import datetime

with open('test.txt', 'r') as f:

    s = f.read()

    #print('open for read...')

    #print(s)

with open('test.txt', 'w') as f:

f.write('今天是 ')

f.write(datetime.now().strftime('%Y-%m-%d'))

f.write(s)

print(s)

with open('test.txt', 'rb') as f:

    s = f.read()

    print('open as binary for read...')

    print(s)