使用新安装的模块而不重新启动交互式会话

During a long interactive session (using ipython) I sometimes need to use a module which I don't already have installed.

在长时间的交互式会话(使用ipython)中，我有时需要使用一个我还没有安装的模块。

After installing the new module, that module becomes importable in new interactive sessions, but not in the session that was running before the installation. I wouldn't want to restart the session due to all of the variables in memory that I'm working with...

在安装了新模块之后，该模块在新的交互式会话中变得很重要，但在安装之前运行的会话中就不重要了。由于内存中的所有变量，我不想重新启动会话。

How can I get such a previously running session to import the new module?

如何获得这样一个先前运行的会话来导入新模块?

1 个解决方案

#1

There's two ways of manually importing things in Python (depending on your python version).

有两种方法可以在Python中手工导入东西(取决于您的Python版本)。

# Python2
import os
os.chdir('/path')
handle = __import__('scriptname') #without .py
handle.func()

Or you can do:

或者你可以做的:

# Python3.3+
import importlib.machinery
loader = importlib.machinery.SourceFileLoader("namespace", '/path/scriptname.py') #including .py
handle = loader.load_module("namespace")
handle.func()

This works a bit differently in previous version of Python3, Don't have the time or access to install older versions now but I do remember hitting a few issues when trying to import and especially reload modules in earlier versions.

To reload these modules in case they change (just to elaborate this answer):

这在以前的Python3版本中工作得有点不同，现在没有时间或访问安装旧版本，但是我记得在尝试导入时遇到了一些问题，特别是在早期版本中重新加载模块。为了重新加载这些模块，以防它们发生变化(只是为了详细说明这个答案):

# Python2
reload(handle)

# Python3
import imp
imp.reload(handle)

#1