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Confix is a language-agnostic configuration parser for Python. It lets you define the default configuration of an app as a standard Python class, then overwrite its attributes from a static configuration file (be it YAML, JSON, INI or TOML) and / or via environment variables. In doing so it validates the overridden settings by:

• making sure they are of the same type
• (optional) marking them as mandatory (useful for passwords)
• (optional) validating them via a callable

Example:

config file:

# config.yml
password: secret

python file:

# main.py
from confix import register, parse

@register()
class config:
    username = 'ftp'
    password = None

parse('config.yaml')
print(config.username)
print(config.password)

shell:

$ python main.py
ftp
secret

For more examples see docs.

• supports YAML, JSON, INI and TOML serialization formats.
• can be easily extended to support other formats.
• support for Python 3
• small code base
• 100% test coverage
• allows you to define 'schemas' in order to validate fields and mark them as required:

# ftp.py
from confix import register, schema

@register()
class config:
    port = schema(default=21, validator=lambda x: isinstance(x, int))
    password = schema(required=True)

Code is solid and fully tested (100% coverage). Its API may change (break) between major versions though.