Python Program to Check If a String Is a Number (Float)

Using float()

 def isfloat(num): try: float(num) return True except ValueError: return False print(isfloat('s12')) print(isfloat('1.123'))

Output

 False True

Here, we have used try except in order to handle the ValueError if the string is not a float.

• In the function isfloat(), float() tries to convert num to float. If it is successful, then the function returns True.
• Else, ValueError is raised and returns False.

For example, 's12' is alphanumeric, so it cannot be converted to float and False is returned; whereas, '1.123' is a numeric, so it is successfully converted to float.

Also Read:

• Python Program to Parse a String to a Float or Int