lange 0.2101.22

Haskell-like intervals for Python

lange

Lazy lists (i.e. Haskell-like ranges) for Python.

Installation

from package

# Set up a virtualenv. 
python3 -m venv venv
source venv/bin/activate

# Install from PyPI
pip install lange

from source

cd my-project
git clone https://github.com/davips/lange ../lange
pip install -e ../lange

Features

• Stable floating-point range generation, e.g.: 0.8 - 0.6 == 0.2 up to 28 digits (customizable).
• Infinite [1 2 ...] or bounded.
• O(1) access/evaluation lst[3443]

Examples

Arithmetic Progression

# "Forbidden" syntax.
import lange
print(-[0.6, 0.8, ..., 2])
# [0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0]

# Conservative syntax.
from lange_ import a_
print(a_[0.6, 0.8, ..., 2])
# [0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0]

pr = a_[0.6, 0.8, ...]
print(pr[:5])
# [0.6 0.8 1.0 1.2 1.4]

Geometric Progression

# "Forbidden" syntax.
import lange
print(~[0.4, 0.8, ..., 2])
# [0.4 0.8 1.6]

# Conservative syntax.
from lange_ import g_
print(g_[0.4, 0.8, ..., 2])
# [0.4 0.8 1.6]

pr = g_[0.4, 0.8, ...]
print(pr[:5])
# [0.4 0.8 1.6 3.2 6.4]