How to split into a 2-dimensional array python

Question

I want to split the lines in a file into 2 separate (2-dimensional) array.

E.g. Username : password array (users[user][pass])

This is the code I have come up with so far :

with open('userlist.txt', 'r') as userlist:
    for line in userlist:
        user, pwd = line.strip().split(':')
        users = [
             [user, pwd]
                ]

Please help. This code currently only lists all of the usernames and all of the passwords. But I want to be able to call the username with the password pair by the same index (e.g. print(users[1][1]))

You can use user = line.strip().split(':')[0] and pwd = line.strip().split(':')[1] IF your first column in the file is always user and the second is password — Sheldore
– Sheldore, Commented Oct 9, 2018 at 13:06
Pls provide sample input and output. array (users[user][pass]) is rather unclear. — user2390182
– user2390182, Commented Oct 9, 2018 at 13:06
Do you want [[user1, user2], [pwd1, pwd2]] or [[user1, pwd1], [user2, pwd2]]? — tobias_k
– tobias_k, Commented Oct 9, 2018 at 13:07

user2390182 · Accepted Answer · 2018-10-09 13:09:22Z

1

The following should suffice. Note that you have to initialize the outer data structure before the loop and fill it in the loop:

with open('userlist.txt', 'r') as userlist:
  users = []
  for line in userlist:
    users.append(line.strip().split(':'))

which can be shortened to:

with open('userlist.txt', 'r') as userlist:
  users = [line.strip().split(':') for line in userlist]

answered Oct 9, 2018 at 13:09

user2390182

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Imtinan Azhar · Accepted Answer · 2018-10-09 13:09:28Z

1

i would suggest you do it this way

file=open('userlist.txt', 'r')
line=file.readlines()
users=[l.strip.split(':') for l in line]

what this does is that it takes a line, "uname":"pass", splits it with ":" which gives you ["uname","pass"] and it saves it in each index of the users array

you can now access username via [users[i][0]] and passwords via users[i][1]

answered Oct 9, 2018 at 13:09

Imtinan Azhar

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Comments

Desiigner · Accepted Answer · 2018-10-09 13:14:18Z

0

As you described in your question, you want to add a new list [user, password] to an existing list of all users every time you loop over userlist.

You can do it this way:

    users = []
    with open('userlist.txt', 'r') as userlist:
        for line in userlist:
            user, pwd = line.strip().split(':')
            users.append([user, pwd])

But for this situation there's a better solution using dictionaries:

    users = {}
    with open('userlist.txt', 'r') as userlist:
        for line in userlist:
            user, pwd = line.strip().split(':')
            users[user] = pwd

answered Oct 9, 2018 at 13:14

Desiigner

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