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15 changes: 11 additions & 4 deletions maths/prime_check.py
Original file line number Diff line number Diff line change
Expand Up @@ -29,12 +29,19 @@ def is_prime(number: int) -> bool:
True
>>> is_prime(67483)
False
>>> is_prime(16.1)
Traceback (most recent call last):
...
ValueError: is_prime() only accepts positive integers
>>> is_prime(-4)
Traceback (most recent call last):
...
ValueError: is_prime() only accepts positive integers
"""

# precondition
assert isinstance(number, int) and (
number >= 0
), "'number' must been an int and positive"
if not isinstance(number, int) or not number >= 0:
raise ValueError("is_prime() only accepts positive integers")

if 1 < number < 4:
# 2 and 3 are primes
Expand Down Expand Up @@ -64,7 +71,7 @@ def test_primes(self):
assert is_prime(29)

def test_not_primes(self):
with pytest.raises(AssertionError):
with pytest.raises(ValueError):
is_prime(-19)
assert not is_prime(
0
Expand Down