import numpy as np
import pandas as pd

class MyClass:
    @property
    def data(self):
        return pd.DataFrame(np.random.rand(10, 3))

if __name__ == "__main__":
    fire.Fire(MyClass)

Traceback (most recent call last):
  File "pet_weights.py", line 69, in <module>
    fire.Fire(MyClass)
  File "/home/maye/miniconda3/envs/py37/lib/python3.7/site-packages/fire/core.py", line 164, in Fire
    _PrintResult(component_trace, verbose=component_trace.verbose)
  File "/home/maye/miniconda3/envs/py37/lib/python3.7/site-packages/fire/core.py", line 267, in _PrintResult
    result, trace=component_trace, verbose=verbose)
  File "/home/maye/miniconda3/envs/py37/lib/python3.7/site-packages/fire/helptext.py", line 63, in HelpText
    actions_grouped_by_kind = _GetActionsGroupedByKind(component, verbose=verbose)
  File "/home/maye/miniconda3/envs/py37/lib/python3.7/site-packages/fire/helptext.py", line 332, in _GetActionsGroupedByKind
    members = completion.VisibleMembers(component, verbose=verbose)
  File "/home/maye/miniconda3/envs/py37/lib/python3.7/site-packages/fire/completion.py", line 366, in VisibleMembers
    (member_name, member) for member_name, member in members
  File "/home/maye/miniconda3/envs/py37/lib/python3.7/site-packages/fire/completion.py", line 368, in <listcomp>
    verbose=verbose)
  File "/home/maye/miniconda3/envs/py37/lib/python3.7/site-packages/fire/completion.py", line 311, in MemberVisible
    if member in (absolute_import, division, print_function):
  File "/home/maye/miniconda3/envs/py37/lib/python3.7/site-packages/pandas/core/generic.py", line 1479, in __nonzero__
    f"The truth value of a {type(self).__name__} is ambiguous. "
ValueError: The truth value of a DataFrame is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().