removing elements from a list

Question

How can i remove elements with a value of 0 as they pop upp in this loop?

y = [4, 2, 7, 9]
x = input("run?")
while x:
    for i in range(len(y)):
        y[i] -= 1
    y.append(len(y))
    print(y)

Answer 1

you could always use a list comprehension to filter them:

for i in range(len(y)):
    y[i] -= 1
y = [x for x in y if x != 0]  # <-- added here
y.append(len(y))

EDIT:

I'm silly - these operations could even be combined as so:

while whatever: #<-- fix as suggested by comment on your question
    y = [z-1 for z in y if z > 1]
    y.append(len(y))

Answer 2

y = filter(lambda i: i != 0, y)