Asterisk triangle

triangle.py

chance = ""
while(chance!="no"):
    try:
        num = int(input("Enter the number of rows "))
        for i in range(1, num+1):
            for j in range(num-i, num):
                print("*", end="")
            print()
    except ValueError:
            print("Enter the valid number")
    chance = input("press any key to run the program again type no to exit [yes]/no ")