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Python 3: From Beginner to Advanced

Solution Review: Check Whether a Number is Prime

Explore how to create a Python function that determines whether a number is prime. Understand the use of conditional checks and loops to validate if a number is divisible only by one and itself.

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Solution

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Python 3.5
def is_prime(n):
    """Tests if a number n is prime."""
    if n <= 1: # Adding this condition
        return False
    divisor = 2
    while divisor <= n // divisor:
        if n % divisor == 0:
            return False
        divisor += 1
    return True
n = 1
print(is_prime(n))

Explanation

Over here, we ...