This post explains How to read and write HOCON conf file format in python
You can use pyhocon library to read and write HOCON file format.
What is Pyhocon?
Pyhocon is a python library to parse the hocon file format content. It supports most of the features of a hocon such as substittion including configuration in other files. It also provides the functionality to convert hocon configuration into YAML, JSON formats.
First, Install pyhocon library in project terminal usinbg below command
pip install pyhocon
Collecting pyhocon
Downloading pyhocon-0.3.60.tar.gz (158 kB)
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Collecting pyparsing<4,>=2
Downloading pyparsing-3.1.1-py3-none-any.whl (103 kB)
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Using legacy 'setup.py install' for pyhocon, since package 'wheel' is not installed.
Installing collected packages: pyparsing, pyhocon
Running setup.py install for pyhocon ... done
Successfully installed pyhocon pyparsing
pyhocon provides following functions
- ConfigFactory.parse_file() It parses hocon configuraiton file and returns an object.
- ConfigFactory.parse_string() : It converts the string object and convert to hocon config object
- ConfigFactory.from_dict() : It takes dictionary object and returns config object.
- ConfigFactory.parse_URL
How to read hocon configuration file format in Python
Following are steps to parse hocon file
- Import
pyhoconmodule into code - use
pyhocon.ConfigFactory.parse_file()to read hocon(conf) file. handle exceptions using try and except if it throws an I/O error. - Returns an object of
pyhocon.config_tree.ConfigTree, contains tree of nested elements. - Use getter methods on
ConfigTreeobjectget_string(key)returns the string value,get(key)returns the generic value,- another way using square bracket syntax
conf[key]orconf[parentkey][childkey] - use
get_conf(key)to retrieve parent object get(key, defaultvalue), If key not found, returns default value.
import pyhocon
try:
conf = pyhocon.ConfigFactory.parse_file('data.conf')
url1 = conf.get_string('database.url')
print(url1)
url2 = conf.get('database.url')
print(url2)
url3 = conf['database.url']
print(url3)
url4 = conf['database']['url']
print(url4)
port = conf['server.port']
print(port)
username = conf['database']['username']
print(username)
server = conf.get_config('server')
print(server)
ssl = conf.get('databases.ssl', 'true') # use default value if key not found
print(ssl)
except:
print("Failed to read a data.conf file")
After running the above file, It output
jdbc:mysql://localhost:3306/employee
jdbc:mysql://localhost:3306/employee
jdbc:mysql://localhost:3306/employee
jdbc:mysql://localhost:3306/employee
8080
root
ConfigTree([('host', 'localhost'), ('port', 8080)])
true
