$ pip install pyhocon

//
// You can use # or // for comments
//
{
  databases {
    # MySQL
    active = true
    enable_logging = false
    resolver = null
    # you can use substitution with unquoted strings. If it it not found in the document, it defaults to environment variables
    home_dir = ${HOME} # you can substitute with environment variables
    "mysql" = {
      host = "abc.com" # change it
      port = 3306 # default
      username: scott // can use : or =
      password = tiger, // can optionally use a comma
      // number of retries
      retries = 3
    }
  }

  // multi line support
  motd = """
            Hello "man"!
            How is it going?
         """
  // this will be appended to the databases dictionary above
  databases.ips = [
    192.168.0.1 // use white space or comma as separator
    "192.168.0.2" // optional quotes
    192.168.0.3, # can have a trailing , which is ok
  ]

  # you can use substitution with unquoted strings
  retries_msg = You have ${databases.mysql.retries} retries

  # retries message will be overriden if environment variable CUSTOM_MSG is set
  retries_msg = ${?CUSTOM_MSG}
}

// dict merge
data-center-generic = { cluster-size = 6 }
data-center-east = ${data-center-generic} { name = "east" }

// list merge
default-jvm-opts = [-XX:+UseParNewGC]
large-jvm-opts = ${default-jvm-opts} [-Xm16g]

usage: tool.py [-h] [-i INPUT] [-o OUTPUT] [-f FORMAT] [-n INDENT] [-v]

pyhocon tool

optional arguments:
  -h, --help                 show this help message and exit
  -i INPUT, --input INPUT    input file
  -o OUTPUT, --output OUTPUT output file
  -c, --compact              compact format
  -f FORMAT, --format FORMAT output format: json, properties, yaml or hocon
  -n INDENT, --indent INDENT indentation step (default is 2)
  -v, --verbosity            increase output verbosity

$ cat samples/database.conf | pyhocon -f json

{
  "databases": {
    "active": true,
    "enable_logging": false,
    "resolver": null,
    "home_dir": "/Users/darthbear",
    "mysql": {
      "host": "abc.com",
      "port": 3306,
      "username": "scott",
      "password": "tiger",
      "retries": 3
    },
    "ips": [
      "192.168.0.1",
      "192.168.0.2",
      "192.168.0.3"
    ]
  },
  "motd": "\n            Hello \"man\"!\n            How is it going?\n         ",
  "retries_msg": "You have 3 retries"
}

$ cat samples/database.conf | pyhocon -f properties

databases.active = true
databases.enable_logging = false
databases.home_dir = /Users/darthbear
databases.mysql.host = abc.com
databases.mysql.port = 3306
databases.mysql.username = scott
databases.mysql.password = tiger
databases.mysql.retries = 3
databases.ips.0 = 192.168.0.1
databases.ips.1 = 192.168.0.2
databases.ips.2 = 192.168.0.3
motd = \
            Hello "man"\!\
            How is it going?\

retries_msg = You have 3 retries

$ cat samples/database.conf | pyhocon -f yaml

databases:
  active: true
  enable_logging: false
  resolver: None
  home_dir: /Users/darthbear
  mysql:
    host: abc.com
    port: 3306
    username: scott
    password: tiger
    retries: 3
  ips:
    - 192.168.0.1
    - 192.168.0.2
    - 192.168.0.3
motd: |

            Hello "man"!
            How is it going?

retries_msg: You have 3 retries

include "test.conf"
include "http://abc.com/test.conf"
include "https://abc.com/test.conf"
include "file://abc.com/test.conf"
include file("test.conf")
include required(file("test.conf"))
include url("http://abc.com/test.conf")
include url("https://abc.com/test.conf")
include url("file://abc.com/test.conf")
include package("package:assets/test.conf")

{
  garfield: {
    say: meow
  }
}

{
  mutt: {
    say: woof
    hates: {
      garfield: {
        notes: I don't like him
        say: meeeeeeeooooowww
      }
      include "cat.conf"
    }
  }
}

{
  cat : {
    include "cat.conf"
  }

  dog: {
    include "dog.conf"
  }
}

$ pyhocon -i samples/animals.conf
{
  "cat": {
    "garfield": {
      "say": "meow"
    }
  },
  "dog": {
    "mutt": {
      "say": "woof",
      "hates": {
        "garfield": {
          "notes": "I don't like him",
          "say": "meow"
        }
      }
    }
  }
}