限制Python导入的范围 [英] Limiting scope of Python import

问题描述

我有一些看起来像这样的代码:

I have some code that looks like this:

from pyparsing import Word, alphas, Optional, ...
# Do stuff ...
# And at the end, save a result to the outside world.
parser = ...

# Now use parser but don't use anything else from pyparsing again.

我喜欢调用from <package> import <etc>的便利，但是我只希望将其用于很小的一段代码中.恐怕我为命名空间污染做出了贡献，因为在同一文件中有许多像这样的小片段.

I like having the convenience of calling from <package> import <etc>, but I only want it to be used in a very small segment of code. I am afraid I am contributing to namespace pollution because I have a number of small snippets like this in the same file.

处理这种情况的Python方法是什么?我仍然只是在玩弄它，所以我宁愿不写和重写pyparsing.这么多次.

What is the Pythonic way of handling this situation? I am still just kind of playing around with it, so I would rather not write and rewritepyparsing. so many times.

推荐答案

一种简单的方法是使用函数作用域来控制文件中的导入可见性:

One easy way is to use function scope to control import visibility within a file:

def prepare_parser():
    from pyparsing import Word, alphas, Optional, ...
    # do stuff, and get the final thing to return
    return ...

parser = prepare_parser()

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