How make for loop from comprehensive for loop

Question

As a learner of python, I am confused about some functions. Someone, please make a normal loop from this comprehensive loop. Here items is a dictionary.

items={1:'a',2:'b',4:'d',5:'e'}

items = {k: v for k, v in enumerate(items.values(), start=1)}

I want to make a normal for loop of the upper comprehensive loop. I have tried but don't get the exact result. Look here:

for k,v in enumerate(items.values(),start =1):
                  `items ={k:v}`

Help me.

Also, you aren't building up a new dict; you are just repeatedly replacing the previous value of `items` with a new one. — chepner, Aug 12 '21 at 15:45
This [animation](https://stackoverflow.com/questions/18072759/list-comprehension-on-a-nested-list/45079294#45079294) shows the reverse process. It might still be useful here. — quamrana, Aug 12 '21 at 15:45
Yes chepner I understand what was wrong I am doing. Thanks all. — sadik, Aug 12 '21 at 15:58

score 2 · Answer 1 · answered Aug 12 '21 at 15:47

You can't write directly back into items with for loop. The list comprehension works because it creates a new dictionary and replaces the old one. While for-loop can't do that by itself. So you need to create a new dictionary and add key-values to it:

new_dict = {}
for k, v in enumerate(items.values(), start=1):
    new_dict[k] = v

if needed replace old one with new one afterwards:

items = new_dict

How make for loop from comprehensive for loop

1 Answers1