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How to check if list includes an element using match case?

stackoverflow.com › questions › 75062113 › how-to-check-if-list-includes-an-element-using-match-case

Lists may contain an arbitrary number of elements. There is no way to individually match all of the elements in a list in a case.

You can match all of the elements and then put a guard on the case.

match mylist:
  case [*all_elements] if 'hi' in all_elements:
    ...

This doesn't seem much better than:

if 'hi' in mylist:
  ...

But let's say you want to determine if list has 'hi' as the first element and includes it again?

match mylist:
  case ['hi', *other_elements] if 'hi' in other_elements:
    ...

Answer from Chris on Stack Overflow

reddit.com › r/learnpython › python 3.10 - matching against lists

r/learnpython on Reddit: Python 3.10 - Matching against lists

February 11, 2022 -

Is there a way to match a value against a list of values? I'm trying to do something like this without using a bunch of ifs, but I can't figure out how.

animal = 'dog'
match animal:
    case ['dog', 'cat', 'pig']:
        print('Mammal!')
    case ['crocodile', 'turtle']:
        print('Reptile!')
    case _:
        print('I dont know')

Videos

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Plain English Westminster

benhoyt.com › writings › python-pattern-matching

Structural pattern matching in Python 3.10

However, as the rationale PEP points out, it’s better thought of as a “generalized concept of iterable unpacking”. Many people have asked for a switch in Python over the years, though I can see why that has never been added. It just doesn’t provide enough value over a bunch of if ... elif statements to pay for itself. The new match ... case feature provides the basics of switch, plus the “structural” matching part – and some.

Python

peps.python.org › pep-0636

PEP 636 – Structural Pattern Matching: Tutorial | peps.python.org

If you are using classes to structure your data you can use the class name followed by an argument list resembling a constructor, but with the ability to capture attributes into variables: from dataclasses import dataclass @dataclass class Point: x: int y: int def where_is(point): match point: case Point(x=0, y=0): print("Origin") case Point(x=0, y=y): print(f"Y={y}") case Point(x=x, y=0): print(f"X={x}") case Point(): print("Somewhere else") case _: print("Not a point")

Stack Overflow

stackoverflow.com › questions › 75062113 › how-to-check-if-list-includes-an-element-using-match-case

python - How to check if list includes an element using match case? - Stack Overflow

Top answer

1 of 2

Lists may contain an arbitrary number of elements. There is no way to individually match all of the elements in a list in a case.

You can match all of the elements and then put a guard on the case.

match mylist:
  case [*all_elements] if 'hi' in all_elements:
    ...

This doesn't seem much better than:

if 'hi' in mylist:
  ...

But let's say you want to determine if list has 'hi' as the first element and includes it again?

match mylist:
  case ['hi', *other_elements] if 'hi' in other_elements:
    ...

2 of 2

Using match/case is not the most appropriate way to determine if a list contains some particular value. However, to answer the question then:

mylist= ["hello", "hi", 123, True]

for element in mylist:
    match element:
        case 'hello':
            print('hello detected')
        case 'hi':
            print('hi detected')

Readthedocs

pc-python.readthedocs.io › en › latest › python_advanced › match_case.html

6. Match - Case — PC-Python

In executing do_action("use sword", weapons), the first case statement will check to see if the weapon, sword, is in the weapons list. The second action with the crossbow will result in the print statement indicating that the weapon can’t be used. def do_action(action, weapons): match action.split(): case ["use", weapon] if weapon in weapons: print(f"using {weapon}") case ["use", _]: print(f"Can't use that weapon.") weapons = ["dagger", "sword", "spear"] do_action("use sword", weapons) do_action("use crossbow", weapons)

Medium

lynn-kwong.medium.com › clean-up-your-if-else-python-match-case-explained-for-beginners-3aa29b442091

Clean Up Your if/else: Python match/case Explained for Beginners | by Lynn G. Kwong | Nov, 2025 | Medium | Medium

November 29, 2025 - In simple uses, you can match literal constants just like a switch. For example, you can write a http_error() function using match status: case 400: … case 404: … case _: … to handle HTTP codes with a default fall-back.

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Gui Commits

guicommits.com › python-match-case-examples

Python Match Case Examples 🐍🕹️

September 7, 2022 - As I mentioned initially, the match case goes beyond a regular switch case. Let's match specific status codes with the or statement by using |: from http import HTTPStatus import random http_status = random.choice(list(HTTPStatus)) match http_status: case 200 | 201 | 204 as status: # 👆 Using "as status" extracts its value print(f"Everything is good!

Python.org

discuss.python.org › ideas

Proposal: `for in match` within list comprehension - Ideas - Discussions on Python.org

April 14, 2022 - I saw an example for pattern matching ... class City(typing.NamedTuple): continent: str name: str country: str cities = [ City('Asia', 'Tokyo', 'JP'), City('Asia', 'Delhi', 'IN'), City('North America', 'Mexico City', 'MX'), City('North America', 'New York', 'US'), City('South America', 'São Paulo', 'BR'), ] def match_brazil(): results = [] for city in cities: ...

W3Schools

w3schools.com › python › python_match.asp

Python Match

month = 5 day = 4 match day: case 1 | 2 | 3 | 4 | 5 if month == 4: print("A weekday in April") case 1 | 2 | 3 | 4 | 5 if month == 5: print("A weekday in May") case _: print("No match") Try it Yourself » ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com · If you want to report an error, or if you want to make a suggestion, send us an e-mail: help@w3schools.com · HTML Tutorial CSS Tutorial JavaScript Tutorial How To Tutorial SQL Tutorial Python Tutorial W3.CSS Tutorial Bootstrap Tutorial PHP Tutorial Java Tutorial C++ Tutorial jQuery Tutorial

Tutorialspoint

tutorialspoint.com › home › python › python match case statement

Python Match Case Statement

February 21, 2009 - Normally Python matches an expression against literal cases. However, it allows you to include if statement in the case clause for conditional computation of match variable. In the following example, the function argument is a list of amount and duration, and the intereset is to be calculated for amount less than or more than 10000.

Medium

medium.com › @muhammadshafey063 › python-match-cases-and-their-types-with-uses-0cf2f54cc730

Python: Match cases and their types with uses | by Muhammad shafey | Medium

June 1, 2024 - With its various types, such as Simple Match, Tuple Match, List Match, Dictionary Match, Wildcard Match, and Guard Clause, Match Case provides a robust way to match values against different patterns. By using Match Case, developers can write more efficient, readable, and maintainable code. It is an essential feature in Python that makes coding easier and more enjoyable.

The Teclado Blog

blog.teclado.com › python-match-case

Using "match...case" in Python 3.10

October 26, 2022 - So our first case does not match due to the length of the case expression, even though the comparison expression matches with the first element in the list. The second case is ["hello", name]. This is the case that our input matches with. If you don’t give a literal value for Python to match ...

Stack Overflow

stackoverflow.com › questions › 74069870 › using-pythons-match-case-on-repeated-elements-in-a-list

pattern matching - Using Python's match/case on repeated elements in a list - Stack Overflow

Top answer

1 of 1

This should work:

def score_3(dice: list[int]) -> tuple[str, int]:
    match dice:
        case [1, 1, 1]: 
            return "3 MOOSE", 300
        case n if len(set(n)) == 1 and len(n) == 3: # or if you don't care about dice length: case n if len(set(n)) == 1: 
            return f"{n[0]}S", n[0]*100
        case _: return different_scoring_function(dice)

Datamentor

datamentor.io › python › match-case

Python match...case Statement (With Examples)

Python also lets us use or statements in the cases. For example, number = 2 match number: case 2 | 3: print('Small') case 4 | 5 | 6: print('Medium') case 9 | 10: print('Large') # Output: Small

LearnPython.com

learnpython.com › blog › python-match-case-statement

How to Use a match case Statement in Python 3.10 | LearnPython.com

May 9, 2022 - Additionally, the second case has an if statement that matches only when the optional flag --ask is in the input. Below this, you could implement code to accept user input, then delete the files if the command is confirmed. Notice we had to select all the files to delete by using a list comprehension, which is a compact way of writing a for loop. Take a look at this article for more information on for loops in Python...

Udacity

udacity.com › blog › 2021 › 10 › python-match-case-statement-example-alternatives.html

Python Match-Case Statement: Example & Alternatives | Udacity

September 27, 2022 - It’s sometimes challenging, but ... is the match-case statement. Introduced in Python 3.10, it allows you to evaluate an expression against a list of values....

InfoWorld

infoworld.com › home › software development › programming languages › python

How to use structural pattern matching in Python | InfoWorld

September 8, 2023 - In fact, the chief use case for structural pattern matching is to match patterns of types, rather than patterns of values. Python performs matches by going through the list of cases from top to bottom. On the first match, Python executes the ...

Towards Data Science

towardsdatascience.com › home › latest › the match-case in python 3.10 is not that simple

The Match-Case In Python 3.10 Is Not That Simple | Towards Data Science

January 21, 2025 - If it doesn’t match one of the given 3 "times", the default case will be executed. Why there is a question mark there? I intentionally added it because I want to emphasise the solution. Generally, it won’t be easy to match one of the sub-patterns and then reference which pattern it matched exactly. However, we can have this "reference" in Python.

datagy

datagy.io › home › python posts › python switch (match-case) statements: complete guide

Python Switch (Match-Case) Statements: Complete Guide • datagy

February 23, 2022 - Let’s take a look at the case where more than three items are included. We use the * to unpack any items following the first. This means that it doesn’t matter how many items are in that list: # Matching a complex structure values = ['John', 'Matt', 'Kate', 'Nik', 'Evan'] # Returns: # More than three names: John, Matt, Kate, as well as: Nik, Evan · Python match-case statements can also be used to check the types of something being passed in.