When the values in the array for our for loop are sequential, we can use Python's range() function instead of writing out the contents of our array. In this example we print the result of a small computation based on the value of our iterator variable. We can include more complex logic in the body of a for loop as well. In the example below, we use a for loop to print every number in our array. Here's an Interactive Scrim of a Python For Loop For Loops in Pythonįor loops repeat a portion of code for a set of values.Īs discussed in Python's documentation, for loops work slightly differently than they do in languages such as JavaScript or C.Ī for loop sets the iterator variable to each value in a provided list, array, or string and repeats the code in the body of the for loop for each value of the iterator variable. In this article, we will look at a couple of examples using for loops with Python's range() function. So, in the else clause, we print that the number is prime.Loops are one of the main control structures in any programming language, and Python is no different. That condition is met only when no factors are found, which means that the given number is prime. It works on the logic that the else clause of the for loop runs if and only if we don't break out the for loop. Here, we have used a for.else statement to check if num is prime. In Python, we can also use the for.else statement to do this task without using an additional flag variable.Įxample 2: Using a for.else statement num = 407 You can change the value of variable num in the above source code to check whether a number is prime or not for other integers. The latter range is based on the fact that a composite number must have a factor less than or equal to the square root of that number.
We could have used the range, range(2,num//2) or range(2,math.floor(math.sqrt(num)+1)).
In the above program, our search range is from 2 to num - 1. Note: We can improve our program by decreasing the range of numbers where we look for factors. If it is True, num is not a prime number.Outside the loop, we check if flag is True or False. If we find a factor in that range, the number is not prime, so we set flag to True and break out of the loop. We check if num is exactly divisible by any number from 2 to num - 1. Hence, we only proceed if the num is greater than 1. Numbers less than or equal to 1 are not prime numbers. In this program, we have checked if num is prime or not. But 6 is not prime (it is composite) since, 2 x 3 = 6.Įxample 1: Using a flag variable # Program to check if a number is prime or not are prime numbers as they do not have any other factors. A positive integer greater than 1 which has no other factors except 1 and the number itself is called a prime number.
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