so I happened to receive an xlms file that contains names of individuals with different titles such as Mr, Ms, Dr, Mrs, Judge etc. However some of these names contains multiple titles within one name example "Mr Mrs Ronderval", "Dr Rev Johns Mr" etc. So am trying to remove all of them except for one, hence the final result should be Mr Ronderval or Mrs Ronderval, Dr Johns or Rev Johns or Mr Johns any of them will be fine. So far what i have done is to convert the strings into a list of lists such as name_list = [['Mr','Mrs', 'Ronderval'], ['Dr', 'Rev','Johns', 'Mr']] and have a list of titles title=['Mr', 'Ms', 'Dr', 'Mrs', 'Judge','Rev']. So i tried to iterate through the name_list removing all values from titles and the result obviously is "Roderval" and "Johns" but i want atleast one title to be left in the name Mr Ronderval or Mrs Ronderval, Dr Johns or Rev Johns or Mr Johns. How do i go about this?

Here is my code using list comprehension

 name_list=[[x for x in l if (x not in title )] for l in name_list] 

You can make one pass through your name list checking to find a title and name (anything that is not a title) for each entry as you go.

Example:

name_list = [['Mr','Mrs', 'Ronderval'], ['Dr', 'Rev','Johns', 'Mr']]
title_list = ['Mr', 'Ms', 'Dr', 'Mrs', 'Judge','Rev']

filtered_name_list = []

for one_entry in name_list:
    title, name = None, None

    for name_or_title in one_entry:
        if name_or_title in title_list:
            title = name_or_title
        else:
            name = name_or_title
        if title and name:
            break

    filtered_name_list.append([title, name])

print(filtered_name_list)

Output:

[['Mrs', 'Ronderval'], ['Rev', 'Johns']]

This worked for me:

name_list_all = [['Mr','Mrs', 'Ronderval'], ['Dr', 'Rev','Johns', 'Mr']]
title=['Mr', 'Ms', 'Dr', 'Mrs', 'Judge','Rev']
name_list=[[x for x in l if (x not in title )] for l in name_list_all]
title_list =[[x for x in l if (x  in title )] for l in name_list_all]

[x.append(y[0]) for x,y in zip(name_list,title_list)]