Python unable to grab values from dict file

Question

I have a text file containing dictionaries, one per line, of user information:

{'username': 'jsmith', 'fullname': 'John Smith', 'email': '[email protected]'}
{'username': 'ajones', 'fullname': 'Betty Jones', 'email': '[email protected]'}
{'username': 'pmills', 'fullname': 'Paul Mills', 'email': '[email protected]'}

My python script needs to iterate thru this file and assign each value in each dictionary to a variable. The script looks like this:

import subprocess
import ast

# iterate through users file line by line
with open('users.txt') as users:
  for line in users:
    d_line = ast.literal_eval(line)
    for k,v in d_line.items():
      un = v['username']
      full = v['fullname']
      mail = v['email']
      print (un, full, mail)

But I get this error:

Traceback (most recent call last):
  File "admin-add.py", line 13, in <module>
    un = v['username']
TypeError: string indices must be integers

Not sure why it is still treating the line as a string.

Asked By: Arin Ekandem

||

Source

Answer 1

The problem is that you are iterating through the items in d_line and assigning v to the value of each item. However, v is not a dictionary, it is the value of the key-value pair in d_line, which is a string.

Instead, you should iterate through the key-value pairs in d_line and assign k to the key and v to the value, like this:

import ast

# iterate through users file line by line
with open('users.txt') as users:
  for line in users:
    d_line = ast.literal_eval(line)
    for k, v in d_line.items():
      if k == 'username':
        un = v
      elif k == 'fullname':
        full = v
      elif k == 'email':
        mail = v
    print(un, full, mail)

Answered By: Dodo

Answer 2

It just needs to iterate each line in file and evaluate it as dictionaries then get the value of each keys

from ast import literal_eval

with open('users.txt') as users:
    for line in users:
        d_line = literal_eval(line)
        un, full, mail = d_line['username'], d_line['fullname'], d_line['email']
        print(un, full, mail)

Answered By: Arifa Chan

Python unable to grab values from dict file

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