Assert vs validate in python

from types import IntType, StringType
def some_func(int_arg, str_arg, other_arg):
    assert type(int_arg) == IntType, "id is not an integer: %r" % int_arg
    assert type(str_arg) == StringType or not str_arg
    assert other_arg in (VALUE1, VALUE2, VALUE3), "other arg must be VALUE1, VALUE2, or VALUE3"

Source: stackoverflow.com

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