All Questions
14 questions
5
votes
1
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2k
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Writing a lazy-evaluation dataclass [closed]
I have a dataclass which is frequently used but is slow because as it processes multiple large datasets. I have tried to speed it up by making it lazily-evaluate, where the data is only read when ...
- 69
5
votes
0
answers
208
views
@lazylist - Converts a Python Generator to a List without evaluating every element
Inspired by a blog I read, I made a LazyList class that can wrap an iterable (list, generator etc.) and turn it into a ...
- 2,625
8
votes
4
answers
608
views
Lazy generator of strings in lexicographical order
I needed to write a Python generator that lazily generates, in lexicographical order, strings composed of a certain alphabet (e.g. lowercase English letters).
My first thought was to make an infinite ...
- 645
1
vote
1
answer
1k
views
Lazy evaluation function decorator
Suppose I have some expensive function expensive_computation which takes a long time to compute but it always returns the same value.
I want to avoid paying the ...
- 243
1
vote
1
answer
334
views
Lazy prime counting function [closed]
I have written a simple snippet of code that implements a function that returns a list of primes up to a certain integer n. Assuming that this function could be ...
- 645
9
votes
2
answers
3k
views
Lazy split and semi-lazy split
Sometimes I need to be able to split data into chunks, and so something like str.split would be helpful. This comes with two downsides:
Input has to be strings
You ...
- 44.3k
3
votes
1
answer
89
views
Python JIT container type
This is a follow on from this review. Where I am attempting to improve the performance of my rest client.
I have created an container type (as suggested in my previous post) that lazily instantiates ...
- 831
3
votes
1
answer
299
views
Efficiently determine every factor of a given natural number
It's not hard to find all of the factors of a given natural number. Below is a pretty fast python function that can do just that:
(Modified version of Steinar Lima's function, https://stackoverflow....
- 135
1
vote
1
answer
89
views
Class to help dealing with files, with lazy properties
I have the following class to help me deal with files:
File class:
...
user63272
6
votes
2
answers
2k
views
Python lazy dict with iterator in constructor
This question began as an off-topic answer to this question, but the code here serves a different goal.
I wrote the following class for the purpose of populating a dict on demand from an iterator. ...
- 163
3
votes
1
answer
4k
views
2
votes
2
answers
188
views
Lazy properties for the angle and length of a line segment
The code below shows the pattern I use to manage properties in my classes when I have the following requirements:
Some properties are slow to calculate and are rarely used, so I want them to be lazy
...
- 135
6
votes
2
answers
2k
views
3
votes
2
answers
3k
views
Lazy class instantiation in Python
I've written some class which allows me to derive from it to make objects lazy-instantiated. Do you see notational improvements or maybe even cases where this method might not work (multiple ...
- 143