How to make it run through my whole range?

Question

def isprimelike(n):
    for a in range(2,n-1):
        if pow(a,n,n) == a%n:
            return True
        else:
            return False

When I check n for a given value it just check 2 , then decides if it is true or false and doesn't check the rest of the range. Not sure how to make it check the rest of the range.

Answer 1

That's because you're using a return inside the if-else block. You might want to change the return statement by a print one indicating if it is a prime number or not.

If you want it to return True if all are prime-like or False if at least one is not, then do the following:

def isprimelike(n):
    for a in range(2,n-1):
        if pow(a,n,n) != a%n:
            print('One element is false')
            return False
    return True

The print statement is just to show something, but it's not relevant.

Answer 2

I would try making a list and allow your for loop to append the results of the range into the list then return the list as a whole so you can have access to all the results.

edit: Complely missed the point of your question. Here's the edit.

import sys
def isprimelike(n):
    resultlist = []
    for a in range(2,int(n)-1):
        if pow(a,int(n),int(n)) == a%int(n):
            result.append(True)
        else:
            result.append(False)
    return resultlist

n = sys.argv[1]
resultlist = isprimelike(n)
if True in resultlist:
    if False in resultlist:
        print('List contains both True and False')
        sys.exit(1)
    else:
        print('List is all True')
        sys.exit(1)
if False in resultlist:
    if True in resultlist:
        print('List contains both True and False')
    else:
        print('List is all False')