so-lazy

So Lazy

Lazy loading Python package.

Install

pip install so-lazy

Usage

Function

from so_lazy import lazy

_data = None

@lazy()
def get_data():
    return _data

def _lazy_loader():
    if _data is None:
        _data = load_expensive_data()

if data_needed:
    data = get_data()

Class

from so_lazy import lazy

class Example:

  def __init__(self):
      self._data = None

  @lazy()
  def __len__(self):
      return len(self._data)

  @lazy()
  def __getitem__(self, index):
      return self._data[index]

  def _lazy_loader():
      if self._data is None:
          self._data = load_expensive_data()

example = Example()

if data_needed:
    data = example[3]