Tag: closures

Returning value in a nested function when using memoization

closures dynamic-programming memoization nested-function python

I am trying to implement a count variable in the function below using dynamic programming specifically memoization. The method calculates the value in a Fibonacci sequence at a given index. I cannot figure out why the count (in this case the number of times this program executes) is not returned. Output: Additionally, is this a good way to implement a

What is the difference between Swift Closures, Java Closures, and Python Lambda expressions?

closures javascript lambda python swift

What is the difference between Swift Closures and Python Lambda expressions? I often see websites describe Swift closures as something similar to Python lambda expressions. They serve similar purposes and even the Swift Documentation for closures states that “Closures in Swift are similar to blocks in C and Objective-C and to lambdas in other programming languages.” Python Lambda Expressions Swift

Python generator expression recursion

closures generator-expression python python-internals sieve-of-eratosthenes

This is a question about Python internals. The following code is taken from this video about laziness in python: The sieve function generates prime numbers lazily (read this for the original concept). Conceptually, we add filters to the “sieve”, so every number (say, 10) is tested against all the previously found prime numbers (so 2, 3, 5 and 7) until

How to access captured arguments / closure of python instance method objects?

closures python weak-references

The idea is to implement the Observer pattern in a non leaking / autocleanup fashion. Therefor the instance method objects should be removed when the the associated object is cleaned up by the gc. My original idea was to only store weak references to the instance method objects with a finalizer to call a cleanup routine. However as it turns

Why aren’t python nested functions called closures?

closures nested-function python

I have seen and used nested functions in Python, and they match the definition of a closure. So why are they called “nested functions” instead of “closures”? Are nested functions not closures because they are not used by the external world? UPDATE: I was reading about closures and it got me thinking about this concept with respect to Python. I

Running unit tests on nested functions

closures python testing

I come from the Java world, where you can hide variables and functions and then run unit tests against them using reflection. I have used nested functions to hide implementation details of my classes so that only the public API is visible. I am trying to write unit tests against these nested functions to make sure that I don’t break