Mailman 3 raise TypeError when giving wrong type of argument in functions - Python-ideas

22 Aug 2020


      I wanted to know if there could be TypeError when giving wrong type for arguments in functions
(This usually happens when using other module's function)
e.g:
def sum(nom1: int, nom2: int):
     nom = nom1 + nom2
     return nom
print(sum('hello',2))
if you run this code you will get TypeError for line 2 because 'you can only concatenate str (not "int") to str'
But what am i saying is can it raise TypeError for line 4 because I gave 'hello' as nom1 and nom1 should be int
Now if I want to check arguments types I should use:
def sum(nom1: int, nom2: int):
    if isinstance(nom1, int) and isinstance(nom1, int):
         nom = nom1 + nom2
         return nom
    else:
         raise TypeError('nom1 and nom2 should be int')
print(sum('hello',2))
But if they can add what am I am i saying it can decrease lines of this function by 50% and also function author should not worry about checking types anymore!
(I know I could use 'assert' but I just wanted to write it as simple as possible)