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How to check if string contains numbers in Python?
I have a variable which I am convert to float, but I want to make if statement, to convert it to float only if it contains only numbers.
793
Python String isnumeric() Method The isnumeric() method returns True if all the characters are numeric (0-9), otherwise False. Exponents, like ² and ¾ are also considered to be numeric values. "-1" and "1.5" are NOT considered numeric values, because all the characters in the string must be numeric, and the - and the .
isalnum() is a built-in Python function that checks whether all characters in a string are alphanumeric. In other words, isalnum() checks whether a string contains only letters or numbers or both. If all characters are alphanumeric, isalnum() returns the value True ; otherwise, the method returns the value False .
Just convert it and catch the exception if it fails.
s = "3.14"
try:
val = float(s)
except ValueError:
val = None
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