Python (2.7.6) configparser-read-write configuration file

The Configparser module of the Python Standard library provides a set of APIs to read and manipulate configuration files.

Format of the configuration file

A) The configuration file contains one or more sections, each section has its own option;

b) section is denoted by [Sect_name] , where each option is a key-value pair, using delimiter = or : separated;

c) Spaces at the end of the option delimiter are ignored

d) config file using # and; Comments

A simple sample configuration file myapp.conf

# database Source
[db]
Host = 127.0.0.1
Port = 3306
user = root
pass = root

# SSH
[SSH]
Host = 192.168.1.101
user = Huey
Pass = Huey

Basic operation of Configparser

A) instantiate the Configparser and load the configuration file

CP = Configparser.safeconfigparser () cp.read ('myapp.conf')

b) Get the section list, option key list, and option key value tuple list

Print 'All sections:', Cp.sections ()#sections: [' db ', ' ssh ']Print 'options of [db]:', Cp.options ('DB')#options of [db]: [' host ', ' Port ', ' user ', ' Pass ']Print 'items of [SSH]:', Cp.items ('SSH')#items of [SSH]: [(' Host ', ' 192.168.1.101 '), (' User ', ' Huey '), (' Pass ', ' Huey ')]

c) Read the specified configuration information

Print 'host of DB:', Cp.get ('DB','Host')#host of db:127.0.0.1Print 'host of SSH:', Cp.get ('SSH','Host')#host of Ssh:192.168.1.101

d) Read configuration information by type: Getint, GetFloat, and Getboolean

print type (cp.getint ('db'port'))        # <type ' int ' >

e) determine if option exists

print cp.has_option ('db'host')    # True

f) Set option

Cp.set ('db'host','  192.168.1.102')

g) Delete option

Cp.remove_option ('db'host')

h) Determine if a section exists

print cp.has_section ('db')    #  True

i) Add section

Cp.add_section ('new_sect')

j) Delete section

Cp.remove_section ('db')

k) Save configuration, set, Remove_option, Add_section, and remove_section do not modify the configuration file, the Write method can write the configuration of the Configparser object to the file

Cp.write (Open ('myapp.conf'w')) Cp.write (sys.stdout) 

Allow_no_value

Typically, option is a key-value pair. However, when the Safeconfigparser parameter allow_no_value is set to True, it allows option to not set the value but only as an identity.

Allow_no_value.conf

# option as Flag
[Flag]
Flag_opt

allow_no_value.py

Import= configparser.safeconfigparser (Allow_no_value = True) cp.read ('  myapp.conf')print cp.get ('flag'  flag_opt');    # None

Allow_no_value is set to False by default, if there is an option in the configuration file that does not have a value set, an exception configparser.parsingerror is thrown when the configuration file is read. When Allow_no_value is set to True, if an option is not set the value, the Has_option method returns the True,get method returns None.

DEFAULT section

If there is a section in the configuration file named DEFAULT, then the other sections extend its option and can override its option.

Db.conf

[default]host = 127.0.0.1port = 3306[db_root]user = Rootpass = Root[db_huey]host = 192.168.1.101user = Hueypass = Huey

default_section.py

print cp.get ('db_root'host')    #  127.0.0.1Print cp.get ('db_huey'host ')    # 192.168.1.101

interpolation interpolation

Safeconfigparser provides interpolation features to combine data.

Url.conf

=% (protocol) s://% (server) s:% (port) s/== = 8080=% (protocol) s://% (server) s/  == 192.168.1.102

interpolation_demo.py

ImportCONFIGPARSERCP=Configparser.safeconfigparser () cp.read ('url.conf')PrintCp.get ('http','URL')#http://localhost:8080/PrintCp.get ('FTP','URL')#ftp://192.168.1.102/

For more configparser use, refer to:

• Http://pymotw.com/2/ConfigParser/index.html
• Https://docs.python.org/2/library/configparser.html

Python (2.7.6) configparser-read-write configuration file