whoisfaster.py

import re
import timeit



def is_int_trying(string:str):
    try:
        return float(string).is_integer()
    except ValueError:
        return False


pattern = re.compile(r"([\+\-]?\d+[.[0]]?)")
def is_int_re(string:str):
    return re.match(pattern, string)

cases = {
    "0": True, "-0": True, "+0": True,
    "1": True, "-1": True, "+1": True,
    "0.1": False, "-0.1": False, "+0.1": False,
    "1.1": False, "-1.1": False, "+1.1": False,
    "0.000000000000000000001": False,
    "-0.000000000000000000001": False,
    "+0.000000000000000000001": False,
    "⁰12345": False, "-⁰12345": False, "+⁰12345": False
}

for case, isint in cases.items():
    for checker in (is_int_trying, is_int_re):
        print("func: {}, val: {}\n  correct: {}\n  time: ".format(
            checker.__name__, case, checker(case)==isint
        ), end="")
        print(timeit.timeit(
            "checker(case)==isint",
            globals=globals(),
            number=100000
        ))
    print()