Python相当于node.js的npm链接使用本地开发版本的需求？

Question

>在 Node.js 中，我习惯于使用 npm link 让项目使用依赖项的自定义版本。从节点文档：

首先，包文件夹中的npm link将创建从prefix/package-name到当前文件夹的全局安装符号链接。

接下来，在其他位置，npm link package-name将创建从本地node_modules文件夹到全局符号链接的符号链接。

通过符号链接到站点包来做类似的事情是犹太洁食吗？

Answer 1

确切的类似物是 pip install -e . 或 python setup.py develop 。

https://pip.pypa.io/en/latest/reference/pip_install.html#editable-installs

Answer 2

也许吧，但你可能想做的是使用 virtualenv。Virtualenv允许您创建一个与任何其他环境隔离的python环境：

$ virtualenv myenv
New python executable in myenv/bin/python
Installing setuptools............done.
Installing pip...............done.
$ source myenv/bin/activate

然后，您可以根据需要安装特定版本的python软件包，例如我刚刚找到的随机toolz软件包的版本0.1.0，当最新版本0.2.1时：

(myenv)$ pip install toolz==0.1.0
Downloading/unpacking toolz==0.1.0
  Downloading toolz-0.1.tar.gz
  Running setup.py egg_info for package toolz
Downloading/unpacking itertoolz>=0.5 (from toolz==0.1.0)
  Downloading itertoolz-0.5.tar.gz
  Running setup.py egg_info for package itertoolz
Downloading/unpacking functoolz>=0.4 (from toolz==0.1.0)
  Downloading functoolz-0.4.tar.gz
  Running setup.py egg_info for package functoolz
Installing collected packages: toolz, itertoolz, functoolz
  Running setup.py install for toolz
  Running setup.py install for itertoolz
  Running setup.py install for functoolz
Successfully installed toolz itertoolz functoolz
Cleaning up...

如您所见，它还会安装依赖项。您还可以生成需求文件：

(myenv)$ pip freeze
functoolz==0.4
itertoolz==0.5
toolz==0.1
wsgiref==0.1.2

然后，您可以使用它来在另一个虚拟环境中复制这些相同的依赖项

(myenv)$ pip freeze > reqs.txt
(myenv)$ deactivate
$ source env2/bin/activate
(env2)$ pip freeze
wsgiref==0.1.2
(env2)$ pip install -r reqs.txt 
Downloading/unpacking functoolz==0.4 (from -r reqs.txt (line 1))
  Downloading functoolz-0.4.tar.gz
  Running setup.py egg_info for package functoolz
Downloading/unpacking itertoolz==0.5 (from -r reqs.txt (line 2))
  Downloading itertoolz-0.5.tar.gz
  Running setup.py egg_info for package itertoolz
Downloading/unpacking toolz==0.1 (from -r reqs.txt (line 3))
  Downloading toolz-0.1.tar.gz
  Running setup.py egg_info for package toolz
Requirement already satisfied (use --upgrade to upgrade): wsgiref==0.1.2 in /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6 (from -r reqs.txt (line 4))
Installing collected packages: functoolz, itertoolz, toolz
  Running setup.py install for functoolz
  Running setup.py install for itertoolz
  Running setup.py install for toolz
Successfully installed functoolz itertoolz toolz
Cleaning up...