day4 has an error

[PantiesIsStoopid]

Python30Days\04_Day_Strings\day_4.py", line 171, in
print(challenge.digit()) # True
^^^^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'digit'. Did you mean: 'isdigit'?

[SnehalArde]

type "print (challenge.isdigit())" instead of "print(challenge.digit())"

[Telescope11]

line171 revise:print(challenge.isdigit()) # True