str.isdecimal() and str.isdigit() difference example

There are differences, but they’re somewhat rare^*. It mainly crops up with various unicode characters, such as ²:

>>> c="\u00B2"
>>> c.isdecimal()
False
>>> c.isdigit()
True

You can also go further down the careful-unicode-distinction rabbit hole with the isnumeric method:

>>> c="\u00BD" # ½
>>> c.isdecimal()
False
>>> c.isdigit()
False
>>> c.isnumeric()
True

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^*At least, I’ve never encountered production code that needs to distinguish between strings that contain different types of these exceptional situations, but surely use cases exist somewhere.