如何在不激活所述virtualenv的情况下在virtualenv中找到一个模块？(How to find a module in a virtualenv without activating said virtualenv?)

 假设我有以下设置： 
 
mkdir test && cd test
virtualenv .venv
source .venv/bin/activate
pip install django
mkdir mod1
touch mod1/__init__.py
echo "a = 1" > mod1/mod2.py
 
 这给了我： 
 
test/.venv
test/mod1/__init__.py
test/mod1/mod2.py
 
 我该如何写这个函数： 
 
def get_module(module_name, root_path, virtualenv_path=None)
 
 为了使这个工作： 
 
project_root_path = "./test"
project_virtualenv_path = "./test/.venv"

get_module("mod1.mod2", project_root_path, project_virtualenv_path)
get_module("django.contrib.auth", project_root_path, project_virtualenv_path)
 
 假设我没有激活./test/.venv 。 
 
 我想这样做的原因是因为我正在开发一个vim插件，它将在import语句的python文件中实现gf功能。 我也试图支持virtualenvs。 
 
 编辑： 
 
 此外，脚本不应通过添加或附加到sys.path来更改当前运行时。 这应该通过vim python绑定在vim内部运行，我不认为改变vim python运行时是一个好主意。 
 
 get_module可以返回一个模块对象，也可以返回模块的路径，这正是我基本上要寻找的。 

Suppose I have the following setup:
 
mkdir test && cd test
virtualenv .venv
source .venv/bin/activate
pip install django
mkdir mod1
touch mod1/__init__.py
echo "a = 1" > mod1/mod2.py
 
Which gives me:
 
test/.venv
test/mod1/__init__.py
test/mod1/mod2.py
 
How would I write this function:
 
def get_module(module_name, root_path, virtualenv_path=None)
 
In order for this to work:
 
project_root_path = "./test"
project_virtualenv_path = "./test/.venv"

get_module("mod1.mod2", project_root_path, project_virtualenv_path)
get_module("django.contrib.auth", project_root_path, project_virtualenv_path)
 
Assuming I don't have ./test/.venv activated.
 
The reason I want to do this, is because I'm working on a vim plugin which would implement gf functionality in a python file on an import statement. I'm trying to support virtualenvs as well.
 
EDIT:
 
Also, the script should not alter the current runtime, by adding or appending to sys.path. This should run inside vim, via the vim python bindings, and I don't think altering the vim python runtime would be a good idea.
 
get_module could either return a module object, or the path to the module, which is what I'm basically looking for.

原文：https://stackoverflow.com/questions/11471566