Confuse: painless YAML config files¶
Confuse is a configuration library for Python that uses YAML. It takes care of defaults, overrides, type checking, command-line integration, environment variable support, human-readable errors, and standard OS-specific locations.
What It Does¶
Here’s what Confuse brings to the table:
- An utterly sensible API resembling dictionary-and-list structures
but providing transparent validation without lots of boilerplate
config['num_goats'].get(int)to get the configured number of goats and ensure that it’s an integer.
- Combine configuration data from multiple sources. Using
layering, Confuse allows user-specific configuration to seamlessly
override system-wide configuration, which in turn overrides built-in
defaults. An in-package
config_default.yamlcan be used to provide bottom-layer defaults using the same syntax that users will see. A runtime overlay allows the program to programmatically override and add configuration values.
- Look for configuration files in platform-specific paths. Like
~/.configon Unix; “Application Support” on macOS;
%APPDATA%on Windows. Your program gets its own directory, which you can use to store additional data. You can transparently create this directory on demand if, for example, you need to initialize the configuration file on first run. And an environment variable can be used to override the directory’s location.
- Integration with command-line arguments via argparse or optparse from the standard library. Use argparse’s declarative API to allow command-line options to override configured defaults.
- Include configuration values from environment variables. Values undergo automatic type conversion, and nested dicts and lists are supported.