Python While Loops:

1. Given a variable s that is associated with non-empty string, write some statements that use a while loop to associate a variable vowel_count with the number of lower-case vowels ("a","e","i","o","u") in the string .

2. Assume the availability of a function is_prime. Assume a variable n has been associated with positive integer. Write the statements needed to find out how many prime numbers (starting with 2 and going in increasing order with successively higher primes [2,3,5,7,11,13,...]) can be added before exceeding n. Associate this number with the variable k.

3. Write some code that repeatedly reads a value from standard input into the variable response until at last a Y or y or N or n has been entered.