{"id":24357,"library":"pymaybe","title":"PyMaybe","description":"pymaybe implements Haskell-style Maybe monad in Python, allowing safe chaining of operations on values that may be None. Version 0.1.6 is the latest; releases are infrequent and no breaking changes are documented. The library wraps values in a Maybe container and provides a .maybe attribute for safe access.","status":"active","version":"0.1.6","language":"python","source_language":"en","source_url":"https://github.com/ekampf/pymaybe","tags":["maybe","monad","optional","null-safety","functional"],"install":[{"cmd":"pip install pymaybe","lang":"bash","label":"pip"}],"dependencies":[],"imports":[{"note":"Direct import of the module does not expose the 'maybe' factory; must use from-import.","wrong":"import pymaybe","symbol":"maybe","correct":"from pymaybe import maybe"}],"quickstart":{"code":"from pymaybe import maybe\n\n# Wrap a potentially None value\ndata = maybe({'name': 'Alice', 'job': None})\n# Safe access using .maybe (returns maybe(None) if missing)\njob = data.get('job').maybe\nprint(job)  # None\n# Chaining: get nested key safely\naddress = data.get('address').maybe.get('city').maybe\nprint(address)  # None","lang":"python","description":"Wrap a dict in maybe() then chain .get() calls; each returns a Maybe object. Access the underlying value via .maybe."},"warnings":[{"fix":"Append .maybe to the final expression, e.g., result = maybe(x).get('key').maybe","message":"Always call .maybe at the end of a chain to unwrap the value; forgetting it returns a Maybe object, causing subtle bugs.","severity":"gotcha","affected_versions":"all"},{"fix":"Use `if result.maybe is None:` instead of `if not result:`","message":"The .maybe attribute on a Maybe(None) returns None, but the Maybe object itself is truthy. Use 'value.maybe is None' to check for absence.","severity":"gotcha","affected_versions":"all"},{"fix":"Be aware that operators work on the inner value. For identity checks, unwrap first.","message":"Arithmetic and comparison operators on Maybe objects behave differently: maybe(5) + maybe(3) returns Maybe(8), but comparing with == checks the wrapped value, not identity.","severity":"gotcha","affected_versions":"all"}],"env_vars":null,"last_verified":"2026-05-01T00:00:00.000Z","next_check":"2026-07-30T00:00:00.000Z","problems":[{"fix":"Use `from pymaybe import maybe` and then `maybe(value)`.","cause":"Direct import of the module and attempting to use Maybe class directly.","error":"AttributeError: module 'pymaybe' has no attribute 'Maybe'"},{"fix":"Use `.get('key')` method instead of bracket syntax.","cause":"Trying to use bracket indexing on a Maybe object, e.g., maybe_dict['key'].","error":"TypeError: 'Maybe' object is not subscriptable"}],"ecosystem":"pypi","meta_description":null,"install_score":null,"install_tag":null,"quickstart_score":null,"quickstart_tag":null}