In [1]: %load_ext ipython_reload
In [2]: from foo import some_function
In [3]: some_function()
Out[3]: 42
In [4]: # open foo.py in an editor and change some_function to return 43
In [5]: %reload some_function
In [6]: some_function()
Out[6]: 43
The %reload magic can reload modules not directly imported, imported modules
in the local namespace, and imported variables.
Reloading imported variables may produce unexpected results if the name is
generic, such as in the case of __version__. Python does not track the source
of where a variable was defined, so this code loops all imported modules, and
looks for a matching name, that is the same type as the variable you want to
reload. If you have imported a variable using from foo import bar as baz
this functionality will not work.
