You can get a list of all matching elements with a list comprehension:
[x for x in myList if x.n == 30] # list of all elements with .n==30
If you simply want to determine if the list contains any element that matches and do it (relatively) efficiently, you can do
def contains(list, filter):
for x in list:
if filter(x):
return True
return False
if contains(myList, lambda x: x.n == 3) # True if any element has .n==3
# do stuff
Top answer 1 of 11
227
You can get a list of all matching elements with a list comprehension:
[x for x in myList if x.n == 30] # list of all elements with .n==30
If you simply want to determine if the list contains any element that matches and do it (relatively) efficiently, you can do
def contains(list, filter):
for x in list:
if filter(x):
return True
return False
if contains(myList, lambda x: x.n == 3) # True if any element has .n==3
# do stuff
2 of 11
106
Simple, Elegant, and Powerful:
A generator expression in conjuction with a builtin… (python 2.5+)
any(x for x in mylist if x.n == 10)
Uses the Python any() builtin, which is defined as follows:
any(iterable)
->Return True if any element of the iterable is true. Equivalent to:
def any(iterable):
for element in iterable:
if element:
return True
return False
Reddit
reddit.com › r/learnpython › python filter a list of class objects by class method using filter built-in function problem
r/learnpython on Reddit: Python filter a list of class objects by class method using Filter built-in function problem
January 21, 2022 -
Like ok... the title said it all. For example : I have a list filled by class name Food. The class uniqueness are defined by name and price attribute. And I create a method to check if the Food is free. the question is how do I use the method to filter the list of Food class using the free checking method of food class?
@dataclass
class Food:
name : str
price : int
def isfree(self):
return self.price == 0
food_list = [Food(name = "curry", price = 5), Food(name = "sushi", price = 0)]
filtered_list = filter(Food.isfree, food_list) # got error TypeError: isfree() takes 0 positional arguments but 2 were given Top answer 1 of 2
1
The code runs fine here: https://i.imgur.com/kXq6AhX.png altough I must add that filter has been superseded by list comprehensions, I would advise to use filtered_list = [f for f in food_list if f.isfree()]
2 of 2
1
Is this really your entire code? What version of python are you using? $ cat test.py from dataclasses import dataclass @dataclass class Food: name : str price : int def isfree(self): return self.price == 0 food_list = [Food(name = "curry", price = 5), Food(name = "sushi", price = 0)] filtered_list = filter(Food.isfree, food_list) print(list(filtered_list)) $ python3 --version Python 3.8.2 $ python3 test.py [Food(name='sushi', price=0)] However it would be more proper to pass a function which would call the proper boundmethod of the instance being passed to the delegated filter function. $cat test.py from dataclasses import dataclass @dataclass class Food: name : str price : int def isfree(self): return self.price == 0 food_list = [Food(name = "curry", price = 5), Food(name = "sushi", price = 0)] filtered_list = filter(lambda food: food.isfree(), food_list) print(list(filtered_list)) $ python3 test.py [Food(name='sushi', price=0)]
Filtering list of objects on multiple conditions
This seems more Pythonic to me ... values. I'm imagining if a random python user was to use my package with this filter implementation, I'm not sure if that would make sense. Is the complexity a side effect of using a list of objects to store my data as opposed to something ... More on reddit.com
4
1
July 27, 2023Filtering an array of JSON objects by multiple properties
Array.filter is your friend Basically you can do var filterConditionType = "tree"; var filterConditionColors = ["yellow"," brown"]; var arr = *your object* var filteredArray = arr.filter(el=>el.type==filterConditionType&&el.colors.some(e=>filterConditionColors.some(ele=>ele==e))); I think that should work, can't test because I'm on mobile, more on Array.filter https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter More on reddit.com
27
40
May 8, 2016Advice to get single object using get() or filter().first()
Straight to my question. I know that Django provides .get() function to get a single object from the database and .filter() for getting a queryset… More on reddit.com
10
1
July 26, 2017Applying multiple filters to a list.
[x for x in L if f1(x) and f2(x)]? More on reddit.com
9
9
September 1, 2017Videos
12:13
How Do You Filter A List in Python? 🐍 - YouTube
18:20
Python Filter List - The Easiest Methods - YouTube
07:13
How to Use filter() in Python | Filter Data Like a Pro Using Python ...
01:53
How to Filter Objects in a List with Unique id Values in Python ...
Converting a Filter Object to a List in Python
18:50
MASTERING Python's FILTER Function is Easier Than You Think! - YouTube
GeeksforGeeks
geeksforgeeks.org › python › filter-in-python
filter() in python - GeeksforGeeks
Example: This example shows how to keep only the words starting with the letter 'a' from a list of fruits. ... def starts_a(w): return w.startswith("a") li = ["apple", "banana", "avocado", "cherry", "apricot"] res = filter(starts_a, li) print(list(res)) ... Explanation: function starts_a checks if a word begins with 'a' and filter() applies this function to each fruit and returns only matching ones. ... Return Value: A filter object (an iterator), which can be converted into a list, tuple, set, etc.
Published March 18, 2026
HowToDoInJava
howtodoinjava.com › home › python › python list filter() with examples
Python List filter() with Examples
April 3, 2024 - In Python, we may need to filter a list to extract specific elements based on certain criteria or conditions. The filter() function is a powerful tool in Python that simplifies the process of filtering lists.
FavTutor
favtutor.com › blogs › filter-list-python
Python filter() Function: 5 Best Methods to Filter a List
November 11, 2023 - Our content is crafted by top technical ... content creation and publishing. ... Python provides a powerful built-in function called filter() that allows you to filter elements from a list, tuple, or any other iterable based on specific ...
Note.nkmk.me
note.nkmk.me › home › python
Filter (Extract/Remove) Items of a List with in Python: filter() | note.nkmk.me
May 15, 2023 - In Python, you can use filter() to filter (extract/remove) items of a list, tuple, or other iterable that satisfy the conditions. Built-in Functions - filter() — Python 3.11.3 documentation Basic usa ...
Python Tutorial
pythontutorial.net › home › python basics › how to filter list elements in python
How to Filter List Elements in Python By Practical Examples
March 30, 2025 - Suppose that you have the following list of scores: scores = [70, 60, 80, 90, 50]Code language: Python (python) To get all elements from the scores list where each element is greater than or equal to 70, you use the following code: scores = [70, 60, 80, 90, 50] filtered = [] for score in scores: if score >= 70: filtered.append(score) print(filtered)Code language: Python (python)
DigitalOcean
digitalocean.com › community › tutorials › how-to-use-the-python-filter-function
How To Use the Python Filter Function | DigitalOcean
July 24, 2020 - An iterable is a Python object ... loop. ... This will return a filter object, which is an iterable. We can use a function like list() to make a list of all the items returned in a filter object....
EyeHunts
tutorial.eyehunts.com › home › python filter list of objects
Python filter list of objects - Tutorial - By EyeHunts
January 25, 2023 - class Employee(): def __init__(self, name, salary): self.name = name self.salary = salary def __repr__(self): return self.name alice = Employee('John', 100) bob = Employee('Mike', 70) carl = Employee('Carl', 150) list_of_objects = [alice, bob, carl] filtered_list = list( filter( lambda obj: obj.salary > 80, list_of_objects ) ) print(filtered_list) ... Do comment if you have any doubts or suggestions on this Python filter topic.
Reddit
reddit.com › r/learnpython › filtering list of objects on multiple conditions
r/learnpython on Reddit: Filtering list of objects on multiple conditions
July 27, 2023 - which should give you an idea of how you could iterate over a list of filtering functions and return the objects that pass all of the filters. ... why len() does not work on filter()? filter() does not return iterable or len() does not support all iterable? ... Applying multiple filters to a list. ... Python code for reading hundreds of pages of old scanned legers and returning to me every time a keyword appears?
Linux Manual Page
linux.die.net › diveintopython › html › power_of_introspection › filtering_lists.html
4.5. Filtering Lists
The whole filter expression returns a list, which is assigned to the methodList variable. The first half of the expression is the list mapping part. The mapping expression is an identity expression, which it returns the value of each element. dir(object) returns a list of object's attributes and methods -- that's the list you're mapping.
LabEx
labex.io › tutorials › python-how-to-filter-list-by-element-properties-437810
How to filter list by element properties | LabEx
Learn advanced Python list filtering techniques to efficiently filter elements based on specific properties, using list comprehensions, filter() function, and lambda expressions.
Enterprise DNA
blog.enterprisedna.co › python-filter-list-5-practical-methods-explained
Enterprise DNA: We Help Businesses Put Data and AI to Work
Learn data and AI skills on the platform, bring us in on a project, or run a managed Omni Command Centre. 220K+ professionals trained, 50+ production agents deployed.
Mimo
mimo.org › glossary › python › filter
Python filter(): Syntax, Usage, and Examples
It's particularly useful when working with various data structures in Python. The built-in filter() function creates an iterator from an iterable (like a list) by keeping only the items for which a given function returns True. It provides a clean, functional way to select a subset of data.
ThePythonGuru
thepythonguru.com › python-builtin-functions › filter
Python filter() function - ThePythonGuru.com
Syntax: filter(function or None, iterable) --> filter object ... def is_even(x): if x % 2 == 0: return True else: return False f = filter(is_even, [1, 3, 10, 45, 6, 50]) print(f) for i in f: print(i) ... To produce the result at once we can use the list() function.
Paigeniedringhaus
paigeniedringhaus.com › blog › filter-merge-and-update-python-lists-based-on-object-attributes
Filter, Merge, and Update Python Lists Based on Object Attributes | Paige Niedringhaus
February 23, 2024 - I know this sounds quite complicated, but I broke each of these requirements down into separate methods inside my Python script and learned a lot about working with lists in Python along the way. Today, I’ll show you how to filter lists by whether an attribute exists in an object, how to merge two lists of items together based on matching attributes, and even how to add new object properties to the objects within a list in Python.
Spark By {Examples}
sparkbyexamples.com › home › python › filter elements from python list
Filter Elements from Python List - Spark By {Examples}
May 31, 2024 - The filter() function in Python is used to filter the elements from the list. Let's discuss this filter() method by providing different parameters like
ItsMyCode
itsmycode.com › how-to-filter-list-elements-in-python
How to Filter List Elements in Python? - ItsMyCode
October 15, 2024 - The best way to filter the list elements is using the list comprehension statement [x for x in list if condition]. The condition can be replaced with any function which can be used as a filtering condition.
Programiz
programiz.com › python-programming › methods › built-in › filter
Python filter()
The filter() function selects elements from an iterable based on the result of a function. # returns True if the argument passed is even def check_even(number): if number % 2 == 0: return True return False numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] # if an element passed to check_even() returns ...
Real Python
realpython.com › python-filter-function
Python's filter(): Extract Values From Iterables – Real Python
July 31, 2023 - A second advantage of using filter() ... more memory efficient than an equivalent for loop. Note: In Python 2.x, filter() returns list objects....