[FIXED] ipython help functions(?)(??) dosen't describe info properly

Issue

installed IPython version 8.5.0 via conda.

after running '?' in shell this is part of output:

  object?   -> Details about 'object'.
  object??  -> More detailed, verbose information about 'object'.

so for trying this i also executed:

In [5]: len?
Signature: len(obj, /)
Docstring: Return the number of items in a container.
Type:      builtin_function_or_method

In [6]: len??
Signature: len(obj, /)
Docstring: Return the number of items in a container.
Type:      builtin_function_or_method

as you see there's no different between two functions result, while '??' should reference to source code (based on a book I'm reading) and show more information about object, but it's not happening.

so i think this function isn't working properly, what can i do about it?

link to book im reading

Solution

In this case, len?? doesn't give the source code because the source code is not in Python. It's in C. However, for other functions it will work:

In [1]: import antigravity

In [2]: antigravity.geohash?
Signature: antigravity.geohash(latitude, longitude, datedow)
Docstring:
Compute geohash() using the Munroe algorithm.

>>> geohash(37.421542, -122.085589, b'2005-05-26-10458.68')
37.857713 -122.544543
File:      c:\users\danie\appdata\local\programs\python\python310\lib\antigravity.py
Type:      function

In [3]: antigravity.geohash??
Signature: antigravity.geohash(latitude, longitude, datedow)
Source:
def geohash(latitude, longitude, datedow):
    '''Compute geohash() using the Munroe algorithm.

    >>> geohash(37.421542, -122.085589, b'2005-05-26-10458.68')
    37.857713 -122.544543

    '''
    # https://xkcd.com/426/
    h = hashlib.md5(datedow, usedforsecurity=False).hexdigest()
    p, q = [('%f' % float.fromhex('0.' + x)) for x in (h[:16], h[16:32])]
    print('%d%s %d%s' % (latitude, p[1:], longitude, q[1:]))
File:      c:\users\danie\appdata\local\programs\python\python310\lib\antigravity.py
Type:      function

Answered By - pigrammer