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: Addi…
Tag: closures
What is the difference between Swift Closures, Java Closures, and Python Lambda expressions?
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…
Python generator expression recursion
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 …
How to access captured arguments / closure of python instance method objects?
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 clea…
Why aren’t python nested functions called closures?
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 g…
Running unit tests on nested functions
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…