Mixed function

[Mekire]

You never convert your string to a number.
This makes no sense:

argstr.isdigit() > 100

argstr.isdigit() is just True or False (1 or 0). Not what you want.

You need to convert to int:

>>> string = "100"
>>> string.isdigit()
True
>>> number = int(string)
>>> number
100