python FOR循环在一个函数中连续2个循环只运行第一个循环

Question

I have two FOR loops that can run fine individually. When i try to run them together in the same function only the first loop is run.

My code looks like this:

def loop_code():
        for x in range(10):
            x -= 1 
            print(x)
        for y in range(10):
            y += 1 
            print(y)

loop_code()

output:

-1
0
1
2
3
4
5
6
7
8

I need to output this instead:

-1
0
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
10

Thank you for your help!

Answer 1

That is not an elegant way to do the things. Modifying your index variable while in a for loop breaks the interest of said for loop. If you want you loop to go from -1 to 8 use:

for index in range(-1,9)

Then if you want your second for loop to have its index go from 1 to 10 use:

for other_index in range(1,11)

Your question could use some clarification. I'm helping you on getting the output you want but there might be some XY Problem going on here. Is there a particular reason you wanted to modify your index in the for-loop?

Answer 2

check out the definiton of range() function. a change as simple as range(12) would do. (think about it, you want 12 itarations!)