https://github.com/masipcat/invars

Single assignment variables in Python
https://github.com/masipcat/invars

functional-programming python single-assignment

Last synced: 10 days ago
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Single assignment variables in Python

• Host: GitHub
• URL: https://github.com/masipcat/invars
• Owner: masipcat
• License: gpl-3.0
• Created: 2018-12-07T19:00:27.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2018-12-07T23:59:37.000Z (almost 6 years ago)
• Last Synced: 2024-10-14T06:27:21.445Z (about 1 month ago)
• Topics: functional-programming, python, single-assignment
• Language: Python
• Homepage:
• Size: 16.6 KB
• Stars: 3
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# invars

This package brings *invariable variables* or **single assignment variables** to Python (like in [Erlang](http://erlang.org/doc/reference_manual/expressions.html#variables) and other functional programming languages).

**Examples**

```python

one = 1

two = 2

...

two += one  # invalid!

```

```python

total = 0

for i in range(4):

    total += i  # invalid!

```

## Installation

```console

$ pip install invars

```

## Usage

```

$ invars my_script.py

```

## Why?

>  In functional programming, assignment is discouraged in favor of single assignment. [...] Imperative assignment can introduce side effects while destroying and making the old value unavailable while substituting it with a new one

[Wikipedia](https://en.wikipedia.org/wiki/Assignment_%28computer_science%29#Single_assignment)

> Single assignment variables simplifies a lot of things because it takes out the "time" variable from your programs.

[Stack Overflow](https://stackoverflow.com/questions/11255632/the-purpose-of-single-assignment)

## TODO

 - [ ] Integrate with `flakes8`