CODEWITHSUNDEEP
pythonpython-3.x
Aung Khant
Aung Khant

Reputation: 344

Python's newly featured numeric literal (eg; 234_432) doesn't work with .isdigit()?

I always understood that if something can be converted to integer (ie; something is string representation of numeric), isdigit() return True. This is not the case with the new feature. Here is the sample below:

Code Sample

But why?

Upvotes: 1

Views: 91

Answers (2)

whackamadoodle3000
whackamadoodle3000

Reputation: 6748

You also need to take out the negative sign for negative integers. This way negative integers will work as well. str.replace("_", "").lstrip("-").isdigit().

Upvotes: 1

Dor-Ron
Dor-Ron

Reputation: 1807

To answer your question, looking at the python 3.6 documentation for the isdigit method.

Return true if all characters in the string are digits and there is at least one character, false otherwise.

Since an underscore isn't a digit, the new format will not work well with the current implementation of isdigit. As I commented before, the immediate work around would be: str.replace("_", "").isdigit() where str is string containing the newly formatted number, while avoiding a try-except block with int.

Upvotes: 1

Related Questions