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Questions tagged [frozenset]

questions related to frozenset objects in Python

frozenset is a built-in type for Python programming language. The elements of a set must be hashable. To represent sets of sets, the inner sets must be frozenset objects.

A set is a collection in which no element is repeated. It is often implemented by hashing the objects as they are added to the set, and comparing against those hashes for operations on the set.

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Change a string of frozen set to frozen set

I came across with this "frozenset({' ABC'})" in pandas dataframe but I would like to change it from object type back to frozenset type , for example like this frozenset({' ABC'}) in the row.
Benson Tan
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Sorting a list of frozensets?

Is it possible to lexicographically sort a list of frozensets as in the following example: sort_frozensets(frozenset(['d','b']), frozenset(['a','b']), frozenset(['z','a']), frozenset(['l',''m])) #result = frozenset(['a','b']), frozenset(['z','a']),…
CairoMisr
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What's the difference between .union and | for sets in python?

What's the difference between .union and | for sets in python? >>> a = set([1, 2, 3, 4]) >>> b = set([3, 4, 5, 6]) >>> a|b {1, 2, 3, 4, 5, 6} >>> a.union(b) {1, 2, 3, 4, 5, 6}
Shambhav Agrawal
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Fast API, accept an array in post request

I'm trying to learn how to use the Fast API library. I'm trying to accept an array in the post using frozenset as the docs states, but it doesn't seem to work. import logging from fastapi import FastAPI, BackgroundTasks from worker.celery_app…
user12177026
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How to get the string value from a frozenset that have two or more string values in Python?

import pandas as pd from apyori import apriori from collections import defaultdict ds=pd.read_csv('event.csv',header=None) num_records=len(ds) print(num_records) records=[] for i in range(0,num_records): records.append([str(ds.values[i,j])for j…
Mohamed Tawfeek
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python : Get matched antecedents frozensets comparing with a list

I am trying to get matched antecedents frozensets by comparing with a list like below: ********** Edited ********* dataset = [['Milk', 'Onion', 'Nutmeg', 'Kidney Beans', 'Eggs', 'Yogurt'], ['Dill', 'Onion', 'Nutmeg', 'Kidney Beans',…
Sanjay Chintha
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Python create immutable object dynamically

I am trying to create an inmmutable object, specifically a frozenset, from a list after applying some function foo() to all of it's elements. That is to say: my_list = ['a_1', 'a_2', ... , 'a_n'] given the list my_list, what i want to do is execute…
Biowav
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Retrieve values from a frozen set dictionary (python)

I have a frozen set dictionary of the form: {frozenset({12345, 3245}): 45.95948791503906, frozenset({12345, 12804138}): 48.996036529541016, frozenset({3245, 9876}): 50.67853927612305, Is it possible for me to iterate over the values based on one…
Jerry George
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Python: Membership testing way slower with frozenset than sets, tuples and lists?

I have been reading up for a few hours trying to understand membership testing and speeds as I fell down that rabbit hole. I thought I had gotten it until I ran my own little timeit test Here's the code range_ = range(20, -1, -1) w =…
user1021085
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Appending frozensets to a dictionary

I am working with a piece of code (written in python) that accepts an argument of the form: restricted_bonds = { frozenset((0, 10)), frozenset((3, 14)), frozenset((5, 6)) } I have a tuple of the form: tupl = ((0, 5, 6, 1), (4, 5, 6,…
Wychh
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Why is the Scipy instance of expon() returning type:

I am interested why the code below returns an instance type of rv_frozen when expon() is an instance of class expon_gen(rv_continuous) in the stats._continous_distns.py file. Shouldn't it return type:…
Brian Wiley
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How can I convert frozen sets of keys and values in dictionary to normal ones?

I have a dictionary of frozensets keys and values: {(frozenset(['Age = 70', 'SMOK = y', 'LAD = 75']), frozenset(['CHOL = 220'])): 1.0, (frozenset(['AL = 0.0', 'DIAB = y', 'LAD = 75']), frozenset(['LM = 30'])): 1.0} How can I convert it to a normal…
user91
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Check if item of frozenset in list

I have a dataset which exist of a column with frozenset combinations. Data import pandas as pd import numpy as np d = {'ID1': [frozenset(['a', 'b']), frozenset(['a','c']), frozenset(['c','d'])]} df = pd.DataFrame(data=d) Furthermore, I have a list…
Tox
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Frozenset to list yields wrong results

What I did is: a = dataframe.antecedants print(type(a[0])) print(a[10]) b = a.tolist() print(type(b[10])) print(b[10]) c = [list(x) for x in a] print(type(c[10])) print(c[10]) I was trying to save my apriori dataframe to Elasticsearch, as this…
Aashish Gahlawat
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How is the order of elements returned by list(frozenset()) determined?

I have a following exemplary setup in Python: a = list(frozenset(['haha', 'lol'])) b = list(frozenset(['lol', 'haha'])) Does a == b always return True? Is it possible that the list of frozenset of the same elements can return False with the above…
mzmyslowski
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