Help a String Get Lucky

Use a while loop to complete the function get_lucky so that it receives a string poor_string and an integer lucky_number as a parameter. Add "7" to poor_string an amount of times equal to lucky_number and return the result.

Examples:

>>>  get_lucky("rabbit foot", 3)
'rabbit foot777'

>>>  get_lucky("shiny penny", 5)
'shiny penny77777'

Hint: You can use the += operator to concatenate new stuff to strings.

Another Hint: You might need to keep track of how many times you've added the string "7" somewhere. And watch out for those infinite loops. They're dangerous!

Daft Punk was absolutely not playing during the creation of this assignment.

Test Cases

test luckiness - Run Test 

def test_luckiness():
    assert get_lucky("shiny penny", 5) == "shiny penny77777"

Solution 1 

def get_lucky(poor_string, lucky_number):
    count = 0
    while count < lucky_number:
        poor_string += "7"
        count += 1
    return poor_string
def get_lucky(poor_string, lucky_number): pass
Python 3.6