Autoreload of modules in IPython [duplicate]

Question

Is there a way to have IPython automatically reload all changed code? Either before each line is executed in the shell or failing that when it is specifically requested to. I'm doing a lot of exploratory programming using IPython and SciPy and it's quite a pain to have to manually reload each module whenever I change it.

Answer 1

For IPython version 3.1, 4.x, and 5.x

%load_ext autoreload %autoreload 2 

Then your module will be auto-reloaded by default. This is the doc:

File:       ...my/python/path/lib/python2.7/site-packages/IPython/extensions/autoreload.py  Docstring: ``autoreload`` is an IPython extension that reloads modules automatically before executing the line of code typed.  This makes for example the following workflow possible:  .. sourcecode:: ipython     In [1]: %load_ext autoreload     In [2]: %autoreload 2     In [3]: from foo import some_function     In [4]: some_function()    Out[4]: 42     In [5]: # open foo.py in an editor and change some_function to return 43     In [6]: some_function()    Out[6]: 43  The module was reloaded without reloading it explicitly, and the object imported with ``from foo import ...`` was also updated. 

There is a trick: when you forget all of the above when using ipython, just try:

import autoreload ?autoreload # Then you get all the above