yzal

Lazy evaluation for Python.

Usage

To use yzal:

from yzal import lazy, strict

@lazy
def add(x, y):
    sum = x + y
    print('Adding {:d} + {:d} = {:d}', x, y, sum)

The following only creates a Thunk, it does not run the lazy function above.

>>> sum = add(3, 7)

There are two ways to get the result of the lazy evaluation. The first is simply to perform an operation that requires a strict value.

>>> 5 + sum
Adding 3 + 7 = 10
15

The second way is to explicitly request a strict value.

>>> sum = add(3, 7)
>>> strict(sum)
Adding 3 + 7 = 10
10

Requirements

• Python 3.4 or greater
• lazy_object_proxy

Installation

yzal is on PyPI so the best way to install it is:

$ pip install yzal

Thanks

We wish to thank the following projects, without which yzal would have been much harder to write:

• lazy_object_proxy - A fast and thorough lazy object proxy.