Python“导入"范围 [英] Python "import" scope

问题描述

我正在处理一些自动为我生成的 Python 代码.我想避免手动编辑这些 python 文件 &因此这个问题/问题:

I am dealing with some python code automatically generated for me. I want to avoid manually editing these python files & hence this question/issue:

foo.py:

def foo():
  print "foo"

boo.py:

def boo():
  foo.foo()    # <-- global name 'foo' not defined
  print "boo"

bar.py:

import foo
import boo
def bar():
  boo.boo()
  print "bar"

执行:

python.exe bar.py

python.exe bar.py

给出一个错误，boo 没有找到 foo.但是 bar 正在导入 foo &嘘.foo 不应该自动对 boo 可用吗?

gives an error that boo did not find foo. But bar is importing both foo & boo. Shouldn't foo be automatically available to boo?

有没有办法做到这一点?如上所述 boo.py 是为我自动生成的 &我想避免将 import foo 添加到 boo.py.

Is there a way to do so? As said boo.py is automatically generated for me & I want to avoid adding import foo to boo.py.

谢谢.

推荐答案

但是 bar 正在导入 foo &嘘.不应该 foo 是自动的可以嘘吗?

But bar is importing both foo & boo. Shouldn't foo be automatically available to boo?

不，不应该:import，就像绑定名称的任何其他方式一样，将该名称绑定在单个特定范围内，而不是在您可能想要的所有范围内".

No it shouldn't: import, like any other way to bind a name, binds that name in a single, specific scope, not "in all scopes you could ever possibly want it in".

有没有办法做到这一点?正如所说boo.py 是自动生成的我&我想避免添加 import foo到 boo.py

Is there a way to do so? As said boo.py is automatically generated for me & I want to avoid adding import foo to boo.py

有一个非常糟糕的 hack —— 我不想忍受它(我宁愿把我的精力放在让 boo.py 修复的完全损坏的代码生成器上——如果它有这么大的错误，比如缺少关键的必需导入，它还有什么可怕的东西?！)，但是，嘿，这不是我的葬礼......;-)

There's one very bad hack -- I wouldn't want to live with it (I'd much rather pour my energy into getting that totally broken code generator that makes boo.py fixed -- if it has such a huge bug as missing a crucial needed import, what other horrors can it have in store?!), but, hey, it ain't my funeral...;-)

让 bar.py 开始...:

import foo
import boo
import __builtin__
__builtin__.foo = foo

这样你就让标识符 foo 成为了一个假的、人工的内置名称"(唯一一种在每个范围内都可用的名称，除非被隐藏通过名称的其他干预绑定在更近的范围内)引用模块 foo.

This way you've made identifier foo a "fake, artificial built-in name" (the only kind of name that is available from every scope, unless shadowed by other intervening bindings of the name in closer scopes) referring to the module foo.

不推荐的程序，只是一个临时解决方法，用于构建 boo.py 的代码生成器中可怕的、明显的错误.修复该错误，以便您尽快停用此黑客！

NOT recommended procedure, just a temporary workaround for the horrible, glaring bug in the code generator that builds boo.py. Get that bug fixed so you can retire this hack ASAP!

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