CODEWITHSUNDEEP
pythonstringpython-3.4
Haleemur Ali
Haleemur Ali

Reputation: 28313

isnumeric & isdecimal not behaving as expected

In python strings have a method isnumeric and isdigit.

I was under the (wrong) impression that isnumeric and isdecimal would return True for strings such as 123.45 and false otherwise. I'm running the following version of python:

Python 3.4.2 (default, Jan  7 2015, 11:54:58) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.56)] on darwin

And I found that isnumeric and isdecimal return true if all characters in the string are integers, but false if a '.' (dot) is present. What causes this behaviour? Shouldn't '123.45'.isnumeric() return True?

>>> mystr_a = '123.45'
>>> mystr_b = '123'
>>> 
>>> mystr_a.isnumeric()
False
>>> mystr_a.isdecimal()
False
>>> mystr_b.isnumeric()
True
>>> mystr_b.isdecimal()

Upvotes: 0

Views: 2802

Answers (1)

grovesNL
grovesNL

Reputation: 6075

As defined in the Python documentation, isnumeric returns True if all characters within the string are numeric, otherwise False. A dot is not considered to be numeric.

Upvotes: 2

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