How can I check if a string represents an int, without using try/except?

Question

Is there any way to tell whether a string represents an integer (e.g., \'3\', \'-17\' but not \'3.14\' or \'asf

Answer 1

def is_int_or_float(x):
    try:    
        if int(float(x)):
            if float(x).is_integer():  return 'int'
            else:                      return 'float'
    except ValueError:  return False


for  i  in ['*', '-1', '01', '1.23', '+0011.002', ]:
    print(i, is_int_or_float(i))

# * False
# -1 int
# 01 int
# 1.23 float
# +0011.002 float