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 returnsTrue. - Else,
ValueErroris raised and returnsFalse.
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.