Using isdigit for floats?

Question

a = raw_input(\'How much is 1 share in that company? \')

while not a.isdigit():
    print(\"You need to write a number!\\n\")
    a = raw_input(\'How much is 1 shar         


        

Answer 1

The provided answers fail if the string contains some special characters such as underscore (e.g. '1_1'). The following function returns correct answer in all case that I tested.

def IfStringRepresentsFloat(s):
try:
    float(s)
    return str(float(s)) == s
except ValueError:
    return False