How to use += after breaking for loop?

How to use += after breaking for loop? - Printable Version

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How to use += after breaking for loop? - Frankduc - Dec-30-2021

Hello,

I am new to the forum and new to Python and maybe i did not post in the right part of the forum.

I have this code:

import numpy as np

mlist = [8,7,5,2,1,4,5,6,8]

i = min(mlist)
print("low", i)

t = mlist.index(i)

o = len(mlist)
print("elements", o)

p = slice(0,t+1)
print("slash", mlist[p])


print(mlist[-t-1::-1])

add = 1 + 2 + 3

for x in mlist[-t-1::-1]:
    if x >= add:
     break 
    x += x                         // it return 2, 4, 10 in the output but should return 1, 3, 8
    print("stop",x)

Any explaination why i cant have the right output is appreciated.

Thank you

RE: How to use += after breaking for loop? - bowlofred - Dec-30-2021

You've used x as your loop variable, so it is modified each time through the loop. If you want a variable to hold information across each cycle, you need to use a different variable.

On line 24 and 25 you modify and then print x. But when the loop runs again and goes back to line 21, your modifications are lost.

I'm guessing you're trying to do something like this:

total = 0
for x in mlist[-t-1::-1]:
    print(f"Checking {x} against {add}")
    if x >= add:
     break
    total += x
    print("stop",total)

RE: How to use += after breaking for loop? - Frankduc - Dec-31-2021

First i did that but i initialized my variable inside de loop. I woke up this morning with the same idea.
Thanks for your reply and solution.

(Dec-30-2021, 09:28 PM)bowlofred Wrote: You've used x as your loop variable, so it is modified each time through the loop. If you want a variable to hold information across each cycle, you need to use a different variable.

On line 24 and 25 you modify and then print x. But when the loop runs again and goes back to line 21, your modifications are lost.

I'm guessing you're trying to do something like this:
total = 0
for x in mlist[-t-1::-1]:
    print(f"Checking {x} against {add}")
    if x >= add:
     break
    total += x
    print("stop",total)