settings-helper 0.0.18

Helpers to get specific settings from a particular section of a settings.ini file

Environment-aware configuration management for Python packages using INI files with automatic type conversion to basic types (int, float, None, bool, str). Any variables with multiple comma-separated values will be converted to a list. Handles multi-environment setups (i.e. dev/testing) with automatic file discovery across standard configuration locations. Environment variables override INI values (i.e. prod) when they have the same name (or UPPERCASE name) as variables in the settings.ini file. You can comment out any variables in the settings.ini file with a leading #.

Tested for Python 3.5 - 3.13.

Example settings.ini

[default]
something = 100
# other = 250

[dev]
redis_url = redis://localhost:6379/1
something = 500

[test]
redis_url = redis://localhost:6379/9
things = none, true, false, 1, 2.5, dogs
something_else = 2.0

Searches ~/.config/<package>/settings.ini, /etc/<package>/settings.ini, /tmp/<package>/settings.ini, then ./settings.ini. Copies default settings from package if missing. See Setup in your package below to define a default settings.ini file for your package.

You must include at least one section header in your settings.ini file (like [default]). The configparser will raise a MissingSectionHeaderError if no headers are defined. The only special header is ``[default]``. If you have any additional section headers, each parsed section will only contain things defined in that section, plus anything defined in the [default] section.

Install

pip install settings-helper

QuickStart

import settings_helper as sh

# Get all settings by section
settings = sh.get_all_settings(__name__)
# Returns:
# {
#     'default': {'something': 100},
#     'dev': {'redis_url': 'redis://localhost:6379/1', 'something': 500},
#     'test': {'redis_url': 'redis://localhost:6379/9', 'something': 100, 'something_else': 2.0,
#              'things': [None, True, False, 1, 2.5, 'dogs']}
# }

# Get environment-specific settings (APP_ENV defaults to 'dev')
SETTINGS = sh.get_all_settings(__name__).get(sh.APP_ENV, {})
redis_url = SETTINGS.get('redis_url')
something = SETTINGS.get('something', 100)

# Alternative: use settings getter factory
get_setting = sh.settings_getter(__name__)
redis_url = get_setting('redis_url')
something = get_setting('something', 100)

# All values are automatically converted: 'true' → True, '100' → 100, 'none' → None
# Lists are automatically parsed: 'a,b,c' → ['a', 'b', 'c']

Note that when using the older settings_getter, the ``APP_ENV`` environment variable is used to determine the section of the setttings.ini file to get the value from. This value defaults to dev if not set. If the variable is not defined in the section, it will pull the value from the [default] section. If the variable is not defined in the default section, it will return the optional fallback value.

Setup for a one-off script

Create a settings.ini file next to your script with at least one section header in square brackets (like [my stuff]).

[my stuff]
something = 100
things = none, true, false, 1, 2.5, dogs and cats, grapes
# other = 500

Use the simple get_all_settings function to get a dict of all settings by section header.

import settings_helper as sh

settings = sh.get_all_settings()

For our settings.ini file example, the settings dict from get_all_settings() would be the following:

{
    'my stuff': {
        'something': 100,
        'things': [None, True, False, 1, 2.5, 'dogs and cats', 'grapes']
    }
}

When dealing with settings where values are numbers, but you don’t want them converted (i.e. version numbers like “3.10”), you can set kwarg keep_num_as_string to True when calling get_all_settings (or settings_getter).

import settings_helper as sh

settings = sh.get_all_settings(keep_num_as_string=True)

For our settings.ini file example, the settings dict from get_all_settings(keep_num_as_string=True) would be the following:

{
    'my stuff': {
        'something': '100',
        'things': [None, True, False, '1', '2.5', 'dogs and cats', 'grapes']
    }
}

Setup in your package

Create a default/sample settings.ini file in the module directory of your package, with a [default] section and any other [sections] you want (i.e. app environments)

[default]
something = 100

[dev]
redis_url = redis://localhost:6379/1
something = 500

[test]
redis_url = redis://localhost:6379/9
things = none, true, false, 1, 2.5, dogs
something_else = 2.0

For this settings.ini file example, the settings dict from get_all_settings() would be the following:

{
    'dev': {
        'something': 500,
        'redis_url': 'redis://localhost:6379/1'
    },
    'default': {
        'something': 100
    },
    'test': {
        'something': 100,
        'something_else': 2.0,
        'redis_url': 'redis://localhost:6379/9',
        'things': [None, True, False, 1, 2.5, 'dogs']
    }
}

Create a MANIFEST.in file in your package directory with the following

include settings.ini

Update the setup.py file of the package to include the setting.ini file and add settings-helper to install_requires list

from setuptools import setup, find_packages

setup(
    name='package-name',
    version='0.0.1',
    ...
    packages=find_packages(),
    install_requires=[
        'settings-helper',
        ...
    ],
    include_package_data=True,
    package_dir={'': '.'},
    package_data={
        '': ['*.ini'],
    },
    ...
)

Note, your package directory tree will be something like the following

package-name
├── .gitignore
├── LICENSE.txt
├── MANIFEST.in
├── README.md
├── README.rst
├── package_name/
│   ├── __init__.py
│   └── settings.ini
└── setup.py

Tip

In your <package-name>/tests/__init__.py file, add the following so the test section of settings is automatically used

import os

os.environ['APP_ENV'] = 'test'

API Overview

Configuration Loading

• ``get_all_settings(module_name=’’, keep_num_as_string=False)`` - Return all settings by section

  • module_name: Package name for settings discovery

  • keep_num_as_string: Preserve numeric strings without conversion

  • Returns: Dictionary with section names as keys

  • Internal calls: ih.from_string(), ih.string_to_converted_list()

• ``settings_getter(module_name, section=APP_ENV, keep_num_as_string=False)`` - Create setting getter function

  • module_name: Package name for settings discovery

  • section: Configuration section to use

  • keep_num_as_string: Preserve numeric strings without conversion

  • Returns: Function for retrieving individual settings

  • Internal calls: None

File Management

• ``get_settings_file(module_name=’’, copy_default_if_missing=True, exception=True)`` - Locate settings file

  • module_name: Package name for discovery (empty for current directory)

  • copy_default_if_missing: Copy default settings if missing

  • exception: Raise exception if not found

  • Returns: Path to settings.ini file

  • Internal calls: get_default_settings_file()

• ``get_default_settings_file(module_name, exception=True)`` - Find package default settings

  • module_name: Package name to search

  • exception: Raise exception if not found

  • Returns: Path to default settings.ini in package

  • Internal calls: None

• ``sync_settings_file(module_name)`` - Compare settings with vimdiff

  • module_name: Package name

  • Returns: None (launches vimdiff if files differ)

  • Internal calls: get_settings_file(), get_default_settings_file(), bh.run_output(), bh.run()