cfg-mgr 0.3.0

Simple out-of-box configs

cfgmgr

Simple out of the box configurations for python projects

Basic usage

import cfgmgr

cfgmgr.make_config(env_prefix="CFG_", file_path="config.json", find_file=True)
some_val = cfgmgr.getkey('key')
cfgmgr.setkey('key', 'new_val')
config = cfgmgr.get()          # the global Config object itself

make_config

• Initializes a global Config as per args specified
• Pass in env_prefix to read values from environment variables
  • env_prefix will be prefixed to the keys before reading the environment variable
  • Ex. env_prefix="CFG_" will effectively translate cfgmgr.getkey('foo') to os.getenv('CFG_foo')
• Values are resolved dynamically, so cfgmgr.getkey will respect environment variables set via os.environ (Useful in test cases)
• file_path attempts to resolve the extension and defers to the corresponding loader
  • JSON and env are always supported. TOML is supported on Python 3.11+ (tomllib). YAML and dotenv are supported when their packages are installed — pip install cfg-mgr[yaml] / cfg-mgr[dotenv].
  • Custom Loaders can be implemented and registered via a decorator cfgmgr.fileloaders.register('.extension')
• find_file, if True, will crawl upwards from cwd until it finds a match for file_path
• include_key, if given, enables config includes: a config file may name another file under that key to be pulled in as a base. The including file overrides the included one; nested mappings are deep-merged. Include chains are followed recursively and cycles raise IncludeCycleError.

getkey and setkey

• Getter and setter for individual keys on the global default Config object
• getkey(key, default=None) returns the resolved value, or default if absent
• setkey(key, value) sets an override (highest priority)
• Both raise AttributeError if make_config has not been called prior to the call

get

• Returns the global default Config object itself (a MutableMapping), or None if make_config has not been called
• Use it for mapping-style access: cfgmgr.get()['key'], 'key' in cfgmgr.get(), iteration, etc.