Friday, May 13, 2022

[FIXED] How do I append to list only after a certain value in another python list?

Issue

I have 2 lists. I only want to append to the new list after I've reached the specified value.

old_list = ['apple', 'pear','orange', 'banana', 'grape']
new_list = []
value  = 'orange'

The desired outcome is:

new_list = ['banana', 'grape']

I've tried this, but the result is not what I want:

for i in old_list:
    if i != value:
        new_list.append(i)

Hope that makes sense!


Solution

Use the list.index method to return the index i where the value appears in the old_list. Then slice old_list from index i+1 up to its end:

old_list = ['apple', 'pear','orange', 'banana', 'grape']
value  = 'orange'

i = old_list.index(value)
new_list = old_list[i+1:]


Answered By - jfaccioni
Answer Checked By - Cary Denson (PHPFixing Admin)

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