basic ConfigParser usage

Tshepang Lekhonkhobe

Reading .INI files is very easy with Python. Say you had a file, "config.cfg", with this content:

[numbers]
one: 1
two: 2

The code to read that content is:

import configparser
conf = configparser.ConfigParser()
conf.read("config.cfg")
items = conf.items("numbers")
print(items)

Output:

[('one', '1'), ('two', '2')]

That's a list of tuples, each tuple a key-value pair.

Even better, since these are key-value pairs, why not use a more suitable data type? Here goes:

import configparser
conf = configparser.ConfigParser()
conf.read("config.cfg")
items = dict(conf.items("numbers"))
print(items)

Output:

{'two': '2', 'one': '1'}

That's the dict function, which takes a list of tuples, and converts them to a dictionary. You might also have noticed that the ordering is now a bit off. That's because the dict type doesn't care about ordering. Remember that in order to access dictionary content, you use a key and not an index:

>>> d = {1: 'one'}
>>> d[0]
Traceback (most recent call last):
  File "", line 1, in
KeyError: 0
>>> d[1]
'one'

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