How to convert while loop to for loop in python?

Question

list_from=[1,2,3,4,5,6,7,8,9,10]
list_from2=[a,b,c,d,e,f,g,h,i,j]
from_dict={list_from[i]:list_from2[i] for i in range(len(list_from2))}
list_to = [1,2,5,10]
save=[]
num=0
while num<=len(list_to):
    try:
        if list_to[num] in list_from:
            save.append(from_dict[list_to[num]])
        else:
            save.append('')
       num+=1
   except:
        break

I have the code like the above. I want to convert this while loop code to for loop. (Also, if possible, I want convert to list comprehension code) How can I do this? Thanks for your help.

I think i had a mistake the code. It seems empty list 'save' enter twice. Sorry about that. — lincplus htm
– lincplus htm, Commented Aug 28, 2020 at 13:56
from_dict = dict(zip(list_from, list_from2)) would be simpler. — chepner
– chepner, Commented Aug 28, 2020 at 14:15

Adept · Accepted Answer · 2020-09-02 12:06:07Z

4

You can just replace your

num = 0
while num <= len(list_to):

By

for num in range(0, len(list_to)):

This way, your variable "num" would automatically take value 0, then 1, ... len(list_to)-1

edited Sep 2, 2020 at 12:06

answered Aug 28, 2020 at 13:59

Adept

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Comments

Niranjan Krishna · Accepted Answer · 2020-08-28 14:09:18Z

1

With For loop

for i in range(len(list_to)):
    if list_to[i] in list_from:
        save.append(from_dict[list_to[i]])
    else:
        save.append('')

answered Aug 28, 2020 at 14:09

Niranjan Krishna

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