let 1.0.1

Installation

Install via pip:

$ pip install let

Done.

If you insist on the (slightly) harder way of installing, from source, you know how to do it already and don’t need my help.

I might later upload the source to: https://github.com/TaylorSMarks/let

Quick Start

Once you’ve installed, you can really quickly verified that it works with just this:

>>> from let import let
>>> if let(count = len('Hello World!')):
...     print(count)
12

Documentation

In C, Java, and many other languages, it’s possible to assign variables inside of if or while condition statements. This is useful in allowing you to concisely both assign the value, and check whether a condition is met.

This ability doesn’t exist in Python, because of the thought that when people write something like:

if row = db.fetch_results():
    ...

They may have actually meant:

if row == db.fetch_results():
    ...

Personally, I have never made this mistake. It seems far more like a theoretical mistake that could plausibly happen than one that actually happens and warrants removing features, as was chosen in Python.

Anyways, the let function in this module gives you something very close to that ability in other languages. A few examples:

if let(name = longInstanceName.longAttributeName):
    ...

# Yes, db.fetch_results() should just return a generator. No, it doesn't.
while let(results = db.fetch_results()):
    ...

if let(count = len(nameValuePair)) != 1:
    raise Exception('Bad amount: {}'.format(count))

Copyright

This software is Copyright (c) 2016 Taylor Marks <taylor@marksfam.com>.

See the bundled LICENSE file for more information.