Python while loop does not work properly

Question

I am using a while loop inside a if / else condition. For some reason under one condition the while loop does not work. The condition is shown in my code below. Under these conditions I would assume that the else condition should be utilized and the weight and the max_speed should be decreased until both while conditions are not valid anymore. What am I doing wrong?

weight = 0
max_speed = 15

if weight == 0 and max_speed <= 10:
    while weight == 0 and max_speed <= 10:
        weight=weight+1
        print(weight)
        print(max_speed)
else:
    while weight != 0 and max_speed > 10:
        weight = weight-1
        max_speed=max_speed-1
        print(weight)
        print(max_speed)

Answer 1

I think you are confused between or and and .

and means that the expression will be True if both condition satisfies. Where or means any condition satisfies.

Now based on your code:

weight = 0
max_speed = 15

if weight == 0 and max_speed <= 10:
    # Goes to else block since max_speed = 15 which is >10
else:
    # This while won't be executed since weight = 0
    while weight != 0 and max_speed > 10:

Answer 2

Assuming that you need your weight=0 and max_speed=10 ; You can do this ->

weight = 0
max_speed = 15

while weight !=0 or max_speed > 10:
    if weight>0: 
        weight = weight-1
    else:  
        weight = weight+1
    if max_speed>10:
        max_speed=max_speed-1
    print("{} {}".format(weight, max_speed))

Your output looks like ->

1 14
0 13
1 12
0 11
1 10
0 10