Haskell-like intervals for Python
Project description
lange
Lazy lists (i.e. Haskell-like ranges) for Python. Latest release | Current code | API documentation
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 == 0.2up to 28 digits (customizable). - Infinite
[1 2 ...]or bounded. - O(1) access/evaluation
lst[3443]
Examples
Arithmetic Progression
# Bounded
from lange import ap
print(ap[0.4, 0.8, ..., 2])
"""
[0.4 0.8 .+. 2.0]
"""
# Infinite + slicing
prog = ap[0.4, 0.8, ...]
print(prog[:5])
"""
[0.4 0.8 .+. 2.0]
"""
# As list
print(list(prog[:5]))
"""
[0.4, 0.8, 1.2, 1.6, 2.0]
"""
print(prog[:5].l)
"""
[0.4, 0.8, 1.2, 1.6, 2.0]
"""
# Towards negative.
print(ap[1, -2, ..., -8].l)
"""
[1, -2, -5, -8]
"""
Geometric Progression
# Bounded
from lange import gp
print(gp[0.4, 0.8, ..., 2])
"""
[0.4 0.8 1.6]
"""
# Infinite + slicing
prog = gp[0.4, 0.8, ...]
print(prog[:5])
"""
[0.4 0.8 .*. 6.4]
"""
# As list
print(list(prog[:5]))
"""
[0.4, 0.8, 1.6, 3.2, 6.4]
"""
print(prog[:5].l)
"""
[0.4, 0.8, 1.6, 3.2, 6.4]
"""
# Using negative step.
print(gp[1, -2, ..., 130].l)
"""
[1, -2, 4, -8, 16, -32, 64, -128]
"""
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