--help not working with classes

[kakila]

I cannot get --help to work with classes. I've read the (oldish) "current state" in #364 but it did not help.

Using the example from the documentation

import fire

class Building(object):

  def __init__(self, name, stories=1):
    self.name = name
    self.stories = stories

  def climb_stairs(self, stairs_per_story=10):
    for story in range(self.stories):
      for stair in range(1, stairs_per_story):
        yield stair
      yield 'Phew!'
    yield 'Done!'

if __name__ == '__main__':
  fire.Fire(Building)

I get an error when I run the command suggested in the documentation:

$ python exmaple.py --name="Sherrerd Hall"
Traceback (most recent call last):
  File "example.py", line 17, in <module>
    fire.Fire(Building)
  File "XXX/lib/python3.12/site-packages/fire/core.py", line 161, in Fire
    _PrintResult(
  File "XXX/lib/python3.12/site-packages/fire/core.py", line 272, in _PrintResult
    help_text = helptext.HelpText(
                ^^^^^^^^^^^^^^^^^^
  File "XXX/lib/python3.12/site-packages/fire/helptext.py", line 61, in HelpText
    info = inspectutils.Info(component)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "XXX/lib/python3.12/site-packages/fire/inspectutils.py", line 259, in Info
    inspector = oinspect.Inspector()
                ^^^^^^^^^^^^^^^^^^^^
TypeError: Inspector.__init__() missing 1 required keyword-only argument: 'theme_name'

If I run

python exmaple.py --name="Sherrerd Hall" -- help

I ge the same error; I was expecting to see the methods here. Even if I modified the call to any of

python example.py --name="Sherrerd Hall" --stories=3 -- --help
python example.py --name="Sherrerd Hall" --stories=3 climb_stairs -- --help
python example.py --name="Sherrerd Hall" --stories=3 climb_stairs 2 -- --help

I always get the same error as above.

If I call the method it works

$ python example.py --name="Sherrerd Hall" --stories=3 climb_stairs 2
1
Phew!
1
Phew!
1
Phew!
Done!

using
python 3.12.3
fire 0.7.0

[Ps7ch3]

Same issue here.

python: 3.12.9
fire: 0.7.0

[Ps7ch3]

@kakila It looks like the root issue is that I have ipython version greater than v9.0.0 in my environment.

The Inspector initialization part introduced a breaking change.

Downgrading the ipython version can restore functionality as a workaround.

[Ps7ch3]

Related PR: !588