functools

How to put values on a single raw from multiple columns in Pandas

How to put values on a single raw from multiple columns in Pandas Question: I have been scratching my head for days about this problem. Please, find below the structure of my input data and the output that I want. I color-coded per ID, Plot, Survey, Trial and the 3 estimation methods. In the output, …

Total answers: 1

Automatically add decorator to all inherited methods

Automatically add decorator to all inherited methods Question: I want in class B to automatically add the decorator _preCheck to all methods that have been inherited from class A. In the example b.double(5) is correctly called with the wrapper. I want to avoid to manually re-declare (override) the inherited methods in B but instead, automatically …

Total answers: 2

Python/Cython return Chained function

Python/Cython return Chained function Question: I am trying to return a chained function In the below I would like to give it a list of values that map to functions. For example from the code below get_function([0,1,2]) returns the function fun(x , [a,b,c]) = a*b/x**c = mult(div(pow(x,c),b),a) What I have so far is close def …

Total answers: 1

is there anyway of getting a values index in an iterable when using functools.reduce in python

is there anyway of getting a values index in an iterable when using functools.reduce in python Question: I have a function that would benefit from using functools.reduce it would act something like this import functools def add(total, val, max_index, index): if index > max_index: return total else: return total + val arr = [1,2,3,4,5,6,7,8] functools.reduce(functools.partial(add, …

Total answers: 2

Columns must be same length as ke by using lru_cache

Columns must be same length as ke by using lru_cache Question: I have a problem. I want to get the coordinates long and lat from the address. I want to check directly in the method whether this address already has a long and lat value and if so, should this be taken and not queried …

Total answers: 1

functools.singledispatchmethod with own class as arg type

functools.singledispatchmethod with own class as arg type Question: I would like to use functools.singledispatchmethod to overload the binary arithmetic operator methods of a class called Polynomial. The problem I have is that I can’t find a way to register method calls where other is a Polynomial. Perhaps better explained with a simple example: from __future__ …

Total answers: 1

Python3 pass lists to function with functools.lru_cache

Python3 pass lists to function with functools.lru_cache Question: I want to cache a function that takes a list as a parameter, but when I try to do so with the functools.lru_cache decorator, it fails with TypeError: unhashable type: ‘list’. import functools @functools.lru_cache() def example_func(lst): return sum(lst) + max(lst) + min(lst) print(example_func([1, 2])) Asked By: redfast00 …

Total answers: 5

python equivalent of functools 'partial' for a class / constructor

python equivalent of functools 'partial' for a class / constructor Question: I want to create a class that behaves like collections.defaultdict, without having the usage code specify the factory. EG: instead of class Config(collections.defaultdict): pass this: Config = functools.partial(collections.defaultdict, list) This almost works, but isinstance(Config(), Config) fails. I am betting this clue means there are …

Total answers: 5

Python functools lru_cache with instance methods: release object

Python functools lru_cache with instance methods: release object Question: How can I use functools.lru_cache inside classes without leaking memory? In the following minimal example the foo instance won’t be released although going out of scope and having no referrer (other than the lru_cache). from functools import lru_cache class BigClass: pass class Foo: def __init__(self): self.big …

Total answers: 9

Make @lru_cache ignore some of the function arguments

Make @lru_cache ignore some of the function arguments Question: How can I make @functools.lru_cache decorator ignore some of the function arguments with regard to caching key? For example, I have a function that looks like this: def find_object(db_handle, query): # (omitted code) return result If I apply lru_cache decorator just like that, db_handle will be …

Total answers: 2