Python - is digit

isdigit()

Question

ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4 digits or exactly 6 digits.
If the function is passed a valid PIN string, return true, else return false.

Best answer

• len(pin) in (4, 6) is good thing to know
  
• isdigit() function is to check it contains only number (>0)

def validate_pin(pin):
    return len(pin) in (4, 6) and pin.isdigit()

My Dumn Try

def validate_pin(pin):
    #return true or false
  if pin.isdigit() == False:
    return False
  elif int(pin) < 0:
    return False
  elif len(pin) == 4:
    return True
  elif len(pin) == 6:
    return True
  else:
    return False