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for loop not iterating through all list elements in python

things="pen pencil apple mango litchi grapes pear song music"
stuff=things.split(" ")
items=["a","b","c","d"]

for word in items:
next_one=items.pop()
stuff.append(next_one)
print(stuff)


when I run this code, the resulting list shows that only last two elements are appended from items. Why is it not appending all the elements?

stuff.append(word)

next_one=items.pop()

1 Answer
1

Therefore that you modify items reference You will only add two elements.
Below you can see all values in items variable in every step of loop.

STEP 1

items = ["a","b","c","d"]
next_one = 'd'

STEP 2

items = ["a","b","c"]
next_one = 'c'

STEP 3

items = ["a","b"]
So here the loop ends

To solve it you can change

for word in items:


to

while(items):


Or you can write it in one line:

stuff.extend(list(reversed(items)))


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