使用2to3在原地编辑文件的方法？

Question

我可以在终端中加载2to3文件。它进行大量打印，输出如下：

- print str
+ print(str)  ... 

但文件没有更改。我在“run2to3”之后没有任何指示。请帮忙。在

Answer 1

如果您search for “2to3”，第一个结果是documentation for 2to3。如文档所述，要覆盖文件而不是打印diff，只需添加-w标志：

[When you run the following:]

$ 2to3 example.py

A diff against the original source file is printed. 2to3 can also write the needed modifications right back to the source file. (A backup of the original file is made unless -n is also given.) Writing the changes back is enabled with the -w flag:

$ 2to3 -w example.py