def contain_number(numbers, number):
for current_number in numbers:
if current_number == number:
return True
return False
data = [1, 2, 3]
is_contain2 = contain_number(data, 2)
# is_contain2 is True
is_contain4 = contain_number(data, 4)
# is_contain4 is False
print(f"{is_contain2 = }")
print(f"{is_contain4 = }")