Python program that uses a for loop and the is_happy() function to print all happy numbers between 1 and 100:

def is_happy(n):
    seen = set()
    while n not in seen:
        seen.add(n)
        n = sum(int(i)**2 for i in str(n))
    return n == 1

for i in range(1,101):
    if is_happy(i):
        print(i)

This program uses a for loop to iterate over the range 1 to 100, and for each number, it checks if it is a happy number by calling the is_happy(n) function. If the function returns True, it prints the number.

The function is_happy(n) is defined earlier as a helper function that takes an integer as an argument, it uses a while loop to iterate until the number is in a set called seen. It uses the str(n) method to convert the number to a string, and then the split() method to split the string into a list of digits. It uses a list comprehension to square each digit and sum the squares up. The result is the new value of n. The while loop continues until n is in the set seen, which means it has been seen before and it’s in a loop that doesn’t lead to 1. In that case, the function returns False, otherwise, it returns True.

This program will print all the happy numbers between 1 to 100, which are 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97.