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Check if a given string is a valid number in Python
Suppose we have a string, that holds numeric characters and decimal points, we have to check whether that string is representing a number or not. If the input is like “2.5”, output will be true, if the input is “xyz”, output will be false.
To solve this, we will follow these steps −
- To solve this, we will use the string parsing technique of our programming language. We will try to convert string to number, if there is no exception, then that will be a number, otherwise not a number.
Example
Let us see the following implementation to get better understanding −
def isNumeric(s):
s = s.strip()
try:
s = float(s)
return True
except:
return False
print(isNumeric("0.2"))
print(isNumeric("xyz"))
print(isNumeric("Hello"))
print(isNumeric("-2.5"))
print(isNumeric("10"))Input
“0.2” “abc” “Hello” “-2.5” “10”
Output
True False False True True
Updated on: 27-Aug-2020
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