dill.source.getsource fails inside of ipython

[mmckerns]

tested in python 3.6.9. dill.source.getsource fails to recognize a function defined in the current session. (using most current bleeding edge build of dill).

Works in python:

Python 3.6.9 (default, Sep  7 2019, 21:14:28) 
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.39.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import dill
>>> 
>>> def squared(x):
...   return x*x
... 
>>> dill.source.getsource(squared)
'def squared(x):\n  return x*x\n'
>>> 

Fails in ipython:

Python 3.6.9 (default, Sep  7 2019, 21:14:28) 
Type 'copyright', 'credits' or 'license' for more information
IPython 7.8.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import dill                                                          

In [2]: def squared(x): 
   ...:     return x*x 
   ...:                                                                      

In [3]: dill.source.getsource(squared)[:20]                                                                  
Out[3]: '_HiStOrY_V2_\nimport\\'

[satra]

just an fyi that while dill.source.getsource generates an error, using it on codeobj works fine.

In [21]: dill.source.getsource(dill.detect.code(test))                                                                      
Out[21]: 'def test():\n    return np.random.random(3)\n'

this returns error

In [20]: dill.source.getsource(test)                                                                                        
---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-20-671fbf4a40a5> in <module>
----> 1 dill.source.getsource(test)

~/software/miniconda3/envs/mee-voice/lib/python3.8/site-packages/dill/source.py in getsource(object, alias, lstrip, enclosing, force, builtin)
    352     # get source lines; if fail, try to 'force' an import
    353     try: # fails for builtins, and other assorted object types
--> 354         lines, lnum = getsourcelines(object, enclosing=enclosing)
    355     except (TypeError, IOError): # failed to get source, resort to import hooks
    356         if not force: # don't try to get types that findsource can't get

~/software/miniconda3/envs/mee-voice/lib/python3.8/site-packages/dill/source.py in getsourcelines(object, lstrip, enclosing)
    323     If lstrip=True, ensure there is no indentation in the first line of code.
    324     If enclosing=True, then also return any enclosing code."""
--> 325     code, n = getblocks(object, lstrip=lstrip, enclosing=enclosing, locate=True)
    326     return code[-1], n[-1]
    327 

~/software/miniconda3/envs/mee-voice/lib/python3.8/site-packages/dill/source.py in getblocks(object, lstrip, enclosing, locate)
    249     DEPRECATED: use 'getsourcelines' instead
    250     """
--> 251     lines, lnum = findsource(object)
    252 
    253     if ismodule(object):

~/software/miniconda3/envs/mee-voice/lib/python3.8/site-packages/dill/source.py in findsource(object)
    152 
    153     if not lines:
--> 154         raise IOError('could not extract source code')
    155 
    156     #FIXME: all below may fail if exec used (i.e. exec('f = lambda x:x') )

OSError: could not extract source code

[mmckerns]

@satra: thanks for the information.

[mmckerns]

See also: #359, #464, #516

[fire17]

@satra 's answer simply works! THANKS!! 💛