pymaybe

library0.1.6pypypi✓ verified 86d ago

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.

serialization

pip install pymaybe

github ↗package ↗

INSTALL

IMPORT

SIG · PYMAYBE

pymaybe

serializationpythonv0.1.6

Install

1.6s avg

Import

—

Disk

16MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.1.6 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.000s · 17.8MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 1.6s · import 0.000s · 18MB

16MB installed

● package 16MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

maybe

✓ from pymaybe import maybe

✗ import pymaybe

Direct import of the module does not expose the 'maybe' factory; must use from-import.

Wrap a dict in maybe() then chain .get() calls; each returns a Maybe object. Access the underlying value via .maybe.

from pymaybe import maybe # Wrap a potentially None value data = maybe({'name': 'Alice', 'job': None}) # Safe access using .maybe (returns maybe(None) if missing) job = data.get('job').maybe print(job) # None # Chaining: get nested key safely address = data.get('address').maybe.get('city').maybe print(address) # None

Debug

Known issues

gotchaAlways call .maybe at the end of a chain to unwrap the value; forgetting it returns a Maybe object, causing subtle bugs.

fix

Append .maybe to the final expression, e.g., result = maybe(x).get('key').maybe

affects: all

gotchaThe .maybe attribute on a Maybe(None) returns None, but the Maybe object itself is truthy. Use 'value.maybe is None' to check for absence.

fix

Use `if result.maybe is None:` instead of `if not result:`

affects: all

gotchaArithmetic and comparison operators on Maybe objects behave differently: maybe(5) + maybe(3) returns Maybe(8), but comparing with == checks the wrapped value, not identity.

fix

Be aware that operators work on the inner value. For identity checks, unwrap first.

affects: all

Errors

Common errors & fixes

AttributeError: module 'pymaybe' has no attribute 'Maybe'

Direct import of the module and attempting to use Maybe class directly.

fix

Use `from pymaybe import maybe` and then `maybe(value)`.

TypeError: 'Maybe' object is not subscriptable

Trying to use bracket indexing on a Maybe object, e.g., maybe_dict['key'].

fix

Use `.get('key')` method instead of bracket syntax.

Upgrade

Version history

0.1.6latest on PyPI · released Sep 28, 2015

Audit

Dependencies

No dependency data recorded yet.

Agent activity

9 hits · last 30 days

node

Resources

githubhttps://github.com/ekampf/pymaybe ↗

packagehttps://pypi.org/project/pymaybe/ ↗