configparser is used to process files in a specific format, which essentially uses open to manipulate files.

The configuration file format is as follows:

# The first way of annotation
; The second way of annotation

[node1]  # node
k1 = v1  # key = value
k2 : v2  # key : value

Example

Create a file.conf file with empty contents and enter Python IDE:

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[root@ansheng ~]# touch file.conf 
[root@ansheng ~]# python
Python 2.6.6 (r266:84292, Jul 23 2016, 15:22:56) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 

Adding nodes to files

>>> import configparser
>>> config = configparser.ConfigParser()
>>> config.read('file.conf', encoding='utf-8')
['file.conf']
# Add the nodes "node1","node2" and write to the file
>>> config.add_section("node1")
>>> config.add_section("node2")
>>> config.write(open('file.conf', 'w'))

Check whether the node exists

# Return "True" if the file exists, or "False"
>>> print(config.has_section('node1'))
True
>>> print(config.has_section('node2'))
True
>>> print(config.has_section('node3'))
False

Delete Nodes

# Return "True" if the deleted node exists, or "False"
>>> config.remove_section("node2")
True
>>> config.write(open('file.conf', 'w'))
>>> print(config.has_section('node2'))
False

Setting key-value pairs within nodes

# Don't forget to write to a file after adding key-value pairs
>>> config.set('node1', 'Name', "ansheng")
>>> config.set('node1', 'Blog_URL', "https://blog.ansheng.me")
>>> config.set('node1', 'Hostname', "localhost.localhost")
>>> config.set('node1', 'IP', "127.0.0.1")
>>> config.write(open('file.conf', 'w'))

Check whether the key exists in the node

# Return "True" if the Key of the node exists, or "False"
>>> print(config.has_option('node1', 'Name'))
True
>>> print(config.has_option('node1', 'IP'))
True
>>> print(config.has_option('node1', 'VV'))
False

Delete the key in the node

# Return "True" if the deleted node exists, or "False"
>>> config.remove_option('node1', 'IP')
True
>>> config.write(open('file.conf', 'w'))
>>> print(config.has_option('node1', 'IP'))
False

Gets the value of the specified key under the specified node

# The default return is the string type
>>> config.get('node1', 'Name')
'ansheng'
>>> config.get('node1', 'Blog_URL')
'https://blog.ansheng.me'
# The returned string can be set to the following three data types: int, float and bool.
# v = config.getint('node1', 'k1')
# v = config.getfloat('node1', 'k1')
# v = config.getboolean('node1', 'k1')

Gets all key s under the specified node

# Returns all Key lists below the node
>>> config.options('node1')
['name', 'blog_url', 'hostname']

Gets all key-value pairs under the specified node

# Returns a list in which each tuple is a key-value pair
>>> config.items('node1')
[('name', 'ansheng'), ('blog_url', 'https://blog.ansheng.me'), ('hostname', 'localhost.localhost')]

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Get all nodes

# Gets how many nodes are in the current file
>>> config.sections()
['node1']