Python 3 reference · String Methods

Python String isnumeric() Method

Return True if every character is numeric, including digits, fractions like ½ and numerals from other scripts.

Syntax

str.isnumeric()

True or False.

Numeric charactersTry it yourself

for s in ["42", "½", "Ⅻ", "4.5"]:
    print(repr(s), s.isnumeric())

Output

'42' True
'½' True
'Ⅻ' True
'4.5' False

The broadest of the three checksTry it yourself

print("½".isnumeric(), "½".isdigit(), "½".isdecimal())

Output

True False False

Version	Change
Python 3.0	Added

str.isdecimal() · Return True if every character is a decimal digit (0–9 and their equivalents in other scripts). The strictest digit check.
str.isdigit() · Return True if every character is a digit, including superscripts like ². Signs, spaces and decimal points return False.
Python Strings · tutorial