Quick and efficient lambda functions.
What is fz?
fz provides a nicer way to define lambda functions for Python 3. The syntax is inspired by C++ std::bind, Scala lambdas, and quicklambda for python.
Syntax
fz lambdas use placeholder objects to represent the arguments to the new lambda. The placeholders look like: _1, _2, …, all the way to _255 (the maximum number of positional arguments to a function).
To create a lambda, just build up an expression using these placeholders where you want the arguments to go.
Example Uses
Simple Arithmetic
Many lambdas are just simple arithmetic. For example:
>>> from fz import _1
>>> f = _1 + 1
>>> f(1)
2
>>> f(3)
4
>>> (_1 * 2)(3)
6
>>> (_1 ** 2)(3)
9
>>> list(map(_1 ** 2, range(5)))
[0, 1, 4, 9, 16]Attribute and Item Access
>>> from fz import _1
>>> _1[0]([1, 2])
1
>>> list(map(_1[1], [(0, 1), (2, 3), (4, 5)]))
[1, 3, 5]
>>> _1.imag(1j)
1.0
>>> list(map(_1.imag, (1j, 1 + 2j, 2 + 3j)))
[1, 2, 3]Function Calls
Because we can only wrap things top-down, we must explicitly wrap a function to be defered.
>>> from fz import _f, _1, _2, _3
>>> def f(a, b):
... return a + b
>>> _f(f)(_1, _2)(1, 2)
3
>>> g = _f(f)(_1, -1)
>>> g(1)
0
>>> flip = _f(_1)(_3, _2)
>>> flip(print, 1, 2)
2 1Supported Operations
Binary operators
Unary operators
Attribute access (some names are used for the implementation)
Subscript (item access)
iter
next
abs
License
fz is free software, licensed under the GNU General Public License, version 2. For more information see the LICENSE file.
Source
Source code is hosted on github at https://github.com/llllllllll/fz.
1 maintainer
Release files for fz 0.1.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| fz-0.1.1.tar.gz | 5.5 kB | Details |
Release files / fz-0.1.1.tar.gz
| Download URL | fz-0.1.1.tar.gz |
|---|---|
| Size | 5.5 kB |
| Tags | Source |
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