Python2到Python3代码的转换工具2to3.py

2023年4月15日 208次阅读 来源: nudt_qxx

之前一直遇到Python2代码转到Python3代码的需求，最近才知道Python官方就有一个转换工具：2to3.py。
无论是Python官网下载安装的python还是利用Anaconda安装，目录都在{Python_HOME}\Tools\scripts里面。运行 2to3.py 脚本，打印如下：

python 2to3.py --help
Usage: 2to3 [options] file|dir ...

Options:
  -h, --help show this help message and exit
  -d, --doctests_only Fix up doctests only
  -f FIX, --fix=FIX Each FIX specifies a transformation; default: all
  -j PROCESSES, --processes=PROCESSES
                        Run 2to3 concurrently
  -x NOFIX, --nofix=NOFIX
                        Prevent a transformation from being run
  -l, --list-fixes List available transformations
  -p, --print-function Modify the grammar so that print() is a function
  -v, --verbose More verbose logging
  --no-diffs Don't show diffs of the refactoring
  -w, --write Write back modified files
  -n, --nobackups Don't write backups for modified files
  -o OUTPUT_DIR, --output-dir=OUTPUT_DIR
                        Put output files in this directory instead of
                        overwriting the input files.  Requires -n.
  -W, --write-unchanged-files
                        Also write files even if no changes were required
                        (useful with --output-dir); implies -w.
  --add-suffix=ADD_SUFFIX
                        Append this string to all output filenames. Requires
                        -n if non-empty.  ex: --add-suffix='3' will generate

假设我在E:\pycode目录下有个py2.py文件，代码如下：

print 'test'

我想把上面的代码改成python3版本的。、
应该先cmd进入{Python_HOME}\Tools\scripts目录，然后执行如下：

python 2to3.py -w E:\pycode\py2.py

执行整个流程如下：

D:\Anaconda3\Tools\scripts>python 2to3.py -w E:\pycode\py2.py
RefactoringTool: Skipping optional fixer: buffer
RefactoringTool: Skipping optional fixer: idioms
RefactoringTool: Skipping optional fixer: set_literal
RefactoringTool: Skipping optional fixer: ws_comma
RefactoringTool: Refactored E:\pycode\py2.py
--- E:\pycode\py2.py    (original)
+++ E:\pycode\py2.py    (refactored)
@@ -1 +1 @@
-print 'test'
+print('test')
RefactoringTool: Files that were modified:
RefactoringTool: E:\pycode\py2.py

然后我们可以看到，在E:\pycode目录下多了一个py2.py.bak文件，这是原来的py2.py文件备份。
查看py2.py，内容已被修改为：

print('test')
    原文作者：nudt_qxx
    原文地址: https://blog.csdn.net/xiangxianghehe/article/details/78046196
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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