Function isPrime

other/primelib.py:42–70

input: positive integer 'number' returns true if 'number' is prime otherwise false.

(number)

"""

def isPrime(number):
    """
        input: positive integer 'number'
        returns true if 'number' is prime otherwise false.
    """
    import math # for function sqrt
    
    # precondition
    assert isinstance(number,int) and (number >= 0) , \
    "'number' must been an int and positive"
    
    status = True
    
    # 0 and 1 are none primes. 
    if number <= 1:
        status = False
    
    for divisor in range(2,int(round(math.sqrt(number)))+1):
        
        # if 'number' divisible by 'divisor' then sets 'status'
        # of false and break up the loop. 
        if number % divisor == 0:
            status = False
            break
    
    # precondition
    assert isinstance(status,bool), "'status' must been from type bool"    
    
    return status

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