Feature request: Support Jupyter notebooks and IPython

[zhouyanasd]

I think it can not support jupyter right now, but I hope it could be done lately.

NotImplementedError                       Traceback (most recent call last)
<ipython-input-6-48087d91d6cf> in <module>()
      5     return number
      6 
----> 7 number_to_bits(6)

<decorator-gen-164> in number_to_bits(number)

C:\ProgramData\Anaconda3\lib\site-packages\pysnooper\pysnooper.py in decorate(function, *args, **kwargs)
     70                     write=write, variables=variables,
     71                     depth=depth, prefix=prefix):
---> 72             return function(*args, **kwargs)
     73 
     74     return decorate

<ipython-input-6-48087d91d6cf> in number_to_bits(number)
      1 import pysnooper
      2 
----> 3 @pysnooper.snoop('file.log')
      4 def number_to_bits(number):
      5     return number

C:\ProgramData\Anaconda3\lib\site-packages\pysnooper\tracer.py in trace(self, frame, event, arg)
    180 
    181         now_string = datetime_module.datetime.now().time().isoformat()
--> 182         source_line = get_source_from_frame(frame)[frame.f_lineno - 1]
    183         self.write('{indent}{now_string} {event:9} '
    184                    '{frame.f_lineno:4} {source_line}'.format(**locals()))

C:\ProgramData\Anaconda3\lib\site-packages\pysnooper\tracer.py in get_source_from_frame(frame)
     73             pass
     74     if source is None:
---> 75         raise NotImplementedError
     76 
     77     # If we just read the source from a file, or if the loader did not

NotImplementedError: 

[chaoyue729]

same issue

[cool-RR]

If someone were to write a test case for this and add it to the test suite, I might be tempted to try implementing a solution.

[cool-RR]

Everyone: If you want this to be fixed, I need you to find how to get the code from an iPython shell or a Jupyter notebook. If it's possible, send me the code and I could add that it to PySnooper.

Also, adding a test case to the test suite would be helpful.

[YubinXie]

I'd like to help but I do not really understand what do you mean by the code from iPython shell? The input code for PySnooper is same as the example you provided. As for what is actually going on in iPython, any suggestion to get it out?

[cool-RR]

@YubinXie The function get_source_from_frame attempts to extract the source from the frame object. This is easy with source that resides in files, but more difficult with interactive shells such as IPython and Jupyter because the frame wouldn't have a file name. You need to talk to the IPython and Jupyter and ask whether the source can be extracted from the shell.

[cool-RR]

I just pushed a fix that'll at least make PySnooper fail gracefully when it can't show the source. Now the task remains to get the code out of IPython or Jupyter.

[cool-RR]

I implemented IPython support! Now just Jupyter support left.

[cool-RR]

Oh awesome, looks like that fixed Jupyter as well :)

I made a separate task #43 to add testing for this feature. Any takers?