当gettext安装_时，如何避免flake8的“F821未定义名称'_'”？

Problem overview:

In my project's main script, gettext installs the function _() that is used in other modules for translations (like in print(_('Something to translate'))).

在我的项目的主脚本中,gettext安装了在其他模块中用于翻译的函数_()(例如print(_('Something to translate')))。

As stated by the doc:

正如文件所述:

the _() function [is] installed in Python’s builtins namespace, so it is easily accessible in all modules of your application.

_()函数[是]安装在Python的内置命名空间中,因此可以在应用程序的所有模块中轻松访问它。

So, everything runs fine.

所以,一切都运行良好。

Only problem: flake8 shows errors (actually returned by PyFlakes):

唯一的问题:flake8显示错误(实际上由PyFlakes返回):

$ flake8 *.py
lib.py:2:12: F821 undefined name '_'
main_script.py:8:7: F821 undefined name '_'

This is normal, as _ is indeed not defined in main_script.py nor lib.py.

这是正常的,因为_确实没有在main_script.py和lib.py中定义。

Simple structure that reproduces the problem:

.
├── lib.py
├── locale
│   └── de
│       └── LC_MESSAGES
│           ├── myapp.mo
│           └── myapp.po
└── main_script.py

Where lib.py contains this:

lib.py包含这个:

def fct(sentence):
    return _(sentence)

and main_script.py this:

和main_script.py这个:

#!/usr/bin/env python3

import gettext

import lib

gettext.translation('myapp', 'locale', ['de']).install()
print(_('A sentence'))
print(lib.fct('A sentence'))

and myapp.po contains:

和myapp.po包含:

msgid ""
msgstr ""
"Project-Id-Version: myapp\n"

msgid "A sentence"
msgstr "Ein Satz"

(was compiled by poedit to produce the mo file).

(由poedit编译以生成mo文件)。

As stated above, the main script does work:

如上所述,主脚本确实有效:

$ ./main_script.py 
Ein Satz
Ein Satz

Important note: I'm looking for a solution working both for the script where gettext.install() is called and all other modules that do not need to call gettext.install(). Otherwise, the structure could be even more simple, because calling _() from main_script.py is enough to trigger F821.

重要说明:我正在寻找一个解决方案,它既适用于调用gettext.install()的脚本,也适用于不需要调用gettext.install()的所有其他模块。否则,结构可能更简单,因为从main_script.py调用_()足以触发F821。

Solutions to solve the situation that look bad (or worse):

add a # noqa comment at the end of each line using _()

使用_()在每行末尾添加#noqa注释

--ignore F821 (don't want to do that because this is useful in other situations)

--ignore F821(不想这样做,因为这在其他情况下很有用)

1 个解决方案

#1

You could specify the --builtins="_" which is more specific than --ignore F821.

您可以指定--builtins =“_”,它比--ignore F821更具体。

You should be able to specify this in a configuration file as well if you don't like command line arguments.

如果您不喜欢命令行参数,也应该能够在配置文件中指定它。

#1