python源文件改写

以下是两种Python源文件改写的例子：

1. 将文件中所有除保留字之外的小写字母换成大写字母

import keyword

with open('input_file.py', 'r') as file:
    data = file.read()

tokens = data.split()
new_data = ''
for token in tokens:
    if token.isidentifier() and not keyword.iskeyword(token):
        new_data += token.upper() + ' '
    else:
        new_data += token + ' '

with open('output_file_upper.py', 'w') as file:
    file.write(new_data)

2. 将文件中所有除保留字以外的小写字母转化成大写字母

import keyword

with open('input_file.py', 'r') as file:
    data = file.read()

tokens = data.split()
new_data = ''
for token in tokens:
    if token.isidentifier() and not keyword.iskeyword(token):
        new_data += token.lower() + ' '
    else:
        new_data += token + ' '

with open('output_file_lower.py', 'w') as file:
    file.write(new_data)