Pavel Savchenko blogging Python and more

Amazing things I never knew I could do (aka IPython magic)

23 Oct 2015

Edit an object code

In [1]: import requests
In [2]: %edit -x requests.Session

screenshot-from-shell

By default (without -x param) IPython will execute the code after exiting. See the edit magic documentation

wrap code in pdb or jump into postmortem

In [1]: def foo():
   ...:         raise Exception("bar")
   ...: %debug foo()
   ...:
NOTE: Enter 'c' at the ipdb>  prompt to continue execution.
> <string>(1)<module>()

ipdb> c
---------------------------------------------------------------------------
Exception                                 Traceback (most recent call last)
<ipython-input-14-5b0cb4720e0e> in foo()
      1 def foo():
----> 2         raise Exception("bar")
      3 get_ipython().magic('debug foo()')
      4

Exception: bar

Are you amazed yet? See debug magic documentation.

Persist aliases, macros and namespace variables

In [1]: import logging; logging.basicConfig(); logging.getLogger().setLevel(0)

In [2]: %hist -n
   1: import logging; logging.basicConfig(); logging.getLogger().setLevel(0)
   2: %hist -n

In [3]: %macro console 1
Macro `console` created. To execute, type its name (without quotes).
=== Macro contents: ===
import logging; logging.basicConfig(); logging.getLogger().setLevel(0)

In [4]: %store console
Stored 'console' (Macro)

Now, you can restore stored macros with

In [1]: %store -r

Alternatively, you may toggle autorestore in your profile (e.g ~/.ipython/profile_default/ipython_config.py):

c.StoreMagic.autorestore = True

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