python-cheat-sheet/while.py

x = 10                          #stores 10 in x
while x>0:                      #if x>0 enters loop
    print(x)                    #prints value of x
    x-=1                        #substracts 1 to x same as x=x-1
                                #result: 10,9,8,7,6,5,4,3,2,1