Select element in one list based on the position of n item in another list

Question

title = ['james','tom','kim']
post_id = [5,6,9]
what_to_look = input('Enter Name: ')

x = title == post_id

if what_to_look  == x:
    print('find')
else:
    print('not found')

Hi guys how to get the id 6 in this code? what is wrong why is not working?

Asked By: LegendCoder

||

Source

Answer 1

To get post_id by the respective title you can use .index() method. You can follow the algorithm:

Find if What_to_look is in your title list
if yes, get the index of it using .index() method.
get the element at the same position of post_id list.

so Your final code should be:

title = ['james','tom','kim']
post_ids = [5,6,9]
what_to_look = input('Enter Name: ')

if what_to_look in title:
    position = title.index(what_to_look)
    post_id = post_ids[position]
    print('found', post_id)
else:
    print('not found')

Now you can get id 6 by entering ‘tom’

Answered By: Shounak Das

Answer 2

You can use zip function as follows:

title = ['james','tom','kim']
post_id = [5,6,9]
title_id = list(zip(title, post_id))
what_to_look = input('Enter Name: ')
for i in title_id:
    if i[0] == what_to_look:
        print(f"found. id = {i[1]}")
        break
else:   # it is for-else not if-else condition
    print("not found")

input: james

output: found. id = 5

(Notice that using a dictionary will be much better and more efficient)

Answered By: Chandler Bong

Answer 3

Given two lists of equal length you can use zip(). (Actually the lists don’t have to be the same length but let’s keep it simple)

title = ['james','tom','Kim']
post_id = [5,6,9]

query = input('Enter name: ')

for name, pid in zip(title, post_id):
    if name == query:
        print(pid)
        break
else:
    print('Not found')

Alternatively, convert your lists into a single dictionary then you can do a direct lookup as follows:

title = ['james','tom','Kim']
post_id = [5,6,9]

query = input('Enter name: ')

print(dict(zip(title, post_id)).get(query, 'Not found'))

Answered By: Fred

Select element in one list based on the position of n item in another list

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