Typed lambdas that are short and readable
Project description
Write short and fully-typed lambda
s where you need them.
Features
- Allows to write
lambda
s as_
- Fully typed with annotations and checked with
mypy
, PEP561 compatible - Has a bunch of helpers for better composition
- Easy to start: has lots of docs, tests, and tutorials
Installation
pip install lambdas
You also need to configure mypy
correctly and install our plugin:
# In setup.cfg or mypy.ini:
[mypy]
plugins =
lambdas.contrib.mypy.lambdas_plugin
We recommend to use the same mypy
settings we use.
Examples
Imagine that you need to sort an array of dictionaries like so:
>>> scores = [
... {'name': 'Nikita', 'score': 2},
... {'name': 'Oleg', 'score': 1},
... {'name': 'Pavel', 'score': 4},
... ]
>>> print(sorted(scores, key=lambda item: item['score']))
[{'name': 'Oleg', 'score': 1}, {'name': 'Nikita', 'score': 2}, {'name': 'Pavel', 'score': 4}]
And it works perfectly fine. Except, that you have to do a lot of typing for such a simple operation.
That's where lambdas
helper steps in:
>>> from lambdas import _
>>> scores = [
... {'name': 'Nikita', 'score': 2},
... {'name': 'Oleg', 'score': 1},
... {'name': 'Pavel', 'score': 4},
... ]
>>> print(sorted(scores, key=_['score']))
[{'name': 'Oleg', 'score': 1}, {'name': 'Nikita', 'score': 2}, {'name': 'Pavel', 'score': 4}]
It might really save you a lot of effort,
when you use a lot of lambda
functions.
Like when using returns
library.
We can easily create math expressions:
>>> from lambdas import _
>>> math_expression = _ * 2 + 1
>>> print(math_expression(10))
21
>>> complex_math_expression = 50 / (_ ** 2) * 2
>>> print(complex_math_expression(5))
100.0
Work in progress:
_.method()
is not supported yet for the same reasonTypedDict
s are not tested with__getitem__
__getitem__
does not work with list and tuples (collections), only dicts (mappings)
For now you will have to use regular lamdba
s in these cases.
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