cfgpie

Simplified ConfigParser setup.

This module automates, to some extent, the setup of ConfigParser with cmd-line args parsing ability.

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Installation:

python -m pip install [--upgrade] cfgpie

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Usage:

After installation, simply import the class CfgParser from cfgpie module:

from cfgpie import CfgParser

By passing a name with the name param we can have multiple named instances:

# mymodule.py

from cfgpie import CfgParser

cfg1: CfgParser = CfgParser(name="root")
cfg2: CfgParser = CfgParser(name="root")
cfg3: CfgParser = CfgParser(name="other")


if __name__ == '__main__':

    print("*" * 80)
    print("cfg1:", cfg1.name)
    print("cfg2:", cfg2.name)
    print("cfg3:", cfg3.name)

    print("*" * 80)
    print("cfg1 == cfg3:", cfg1 == cfg3)
    print("cfg1 is cfg3:", cfg1 is cfg3)

    print("*" * 80)
    print("cfg1 == cfg2:", cfg1 == cfg2)
    print("cfg1 is cfg2:", cfg1 is cfg2)

********************************************************************************
cfg1: root
cfg2: root
cfg3: other
********************************************************************************
cfg1 == cfg3: False
cfg1 is cfg3: False
********************************************************************************
cfg1 == cfg2: True
cfg1 is cfg2: True

Setting up our configuration:

# -*- coding: UTF-8 -*-

from os.path import dirname, realpath, join
from sys import modules
from types import ModuleType

from cfgpie import CfgParser

# main python module:
MODULE: ModuleType = modules.get("__main__")

# root directory:
ROOT: str = dirname(realpath(MODULE.__file__))

# config default file path:
CONFIG: str = join(ROOT, "config", "config.ini")

BACKUP: dict = {
    "FOLDERS": {
        "logger": r"${DEFAULT:directory}\logs",  # extended interpolation
    },
    "TESTS": {
        "option_1": "some_value",
        "option_2": 23453,
        "option_3": True,
        "option_4": r"${DEFAULT:directory}\value",  # extended interpolation
        "option_5": ["abc", 345, 232.545, "3534.5435", True, {"key_": "value_"}, False],
    }
}

cfg: CfgParser = CfgParser(
    "root",
    defaults={"directory": ROOT}
)

# we can update `DEFAULT` section:
# cfg.set_defaults(directory=ROOT)

# we can provide a backup dictionary
# in case our config file does not exist
# and by default a new file will be created
cfg.open(
    file_path=CONFIG,
    encoding="UTF-8",
    fallback=BACKUP,
)


if __name__ == '__main__':

    # we're parsing cmd-line arguments
    cfg.read_argv()
    
    # cmd-args are fetched as a list of strings:
    # cfg.read_argv(["--tests-option_1", "another_value", "--tests-option_2", "6543"])

    print(cfg.get("TESTS", "option_1"))
    print(cfg.getint("TESTS", "option_2"))

For interpolation, refer to interpolation-of-values documentation.

To pass cmd-line arguments:

python -O main.py --section-option value --section-option value

cmd-line args have priority over config file and will override the cfg params.

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Defaults:

If not provided, by default, CfgParser will set:

• defaults parameter as dict with section DEFAULT and option directory to the root folder of the __main__ module.

• name parameter to: cfgpie;

• interpolation parameter to ExtendedInterpolation;

• converters parameter to evaluate:

  • list, tuple, set and dict objects using ast.literal_eval() function;

  • decimal objects using decimal.Decimal();

  • path strings using os.path.realpath();

  • folder and file paths which:

    • return a path-like formatted string depending on the operating system;

    • will recursively create the folder structure if missing (see folder() & file() methods in utils.py).

  All of which can be accessed by prefixing them with get:

  • getlist("SECTION", "option")
  • gettuple("SECTION", "option")
  • getset("SECTION", "option")
  • getdict("SECTION", "option")
  • getdecimal("SECTION", "option")
  • getpath("SECTION", "option")
  • getfolder("SECTION", "option")
  • getfile("SECTION", "option")

All other parameters are passed directly to ConfigParser.

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