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Alternative slicing and indexing

Project description

The altslice package provides a number of Slicer classes which can be used to index and slice sequences using alternative indexing. For example:

from altslice import CategoricalSlicer

months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun']
sales = [100, 200, 250, 300, 333, 400]

slicer = CategoricalSlicer(months)

# sales total from January
sales[slicer['Jan']]

# sales from Febuary until May
sales[slicer['Jan':'May']]

Slicers

The following Slicers are provided in the library:

  • CategoricalSlicer : Index using discrete categories.
  • UniformSlicer : Index using evenly spaced numbers with a specific interval.
  • SeqeuenceSlicer : Index using a sorted sequence of numbers.
  • OneBasedSlicer : One-based indexing.

Install

altslice can be installed using pip:

pip install altslice

Testing

altslice uses pytest for testing. The test suite can be executed using py.test.

One-based indexing

If desired the list container can be adjusted to use one-based indexing:

from altslice import OneBasedSlicer

slicer = OneBasedSlicer()

class list(list):
    def __getitem__(self, x):
        return super(list, self).__getitem__(slicer[x])

This adjustment is not recommended.

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