is empty list python - Brave Search

How do I check if a list is empty?

stackoverflow.com › questions › 53513 › how-do-i-check-if-a-list-is-empty

if not a:
    print("List is empty")

Using the implicit booleanness of the empty list is quite Pythonic.

Answer from Patrick on Stack Overflow

geeksforgeeks.org › python › python-check-if-list-empty-not

Check if a list is empty or not in Python - GeeksforGeeks

October 24, 2024 - The not operator is the simplest way to see if a list is empty. It returns True if the list is empty and False if it has any items.

stackoverflow.com › questions › 53513 › how-do-i-check-if-a-list-is-empty

python - How do I check if a list is empty? - Stack Overflow

if not a:
    print("List is empty")

Using the implicit booleanness of the empty list is quite Pythonic.

The Pythonic way to do it is from the PEP 8 style guide.

For sequences, (strings, lists, tuples), use the fact that empty sequences are false:
# Correct:
if not seq:
if seq:

# Wrong:
if len(seq):
if not len(seq):

Discussions

How do I check if this list is "empty"?

Well there are a few ways you could deal with this. First would be to check if userInput is an empty string before converting it to a list. Another possibility would be to filter the list to remove all empty strings, eg via a list comprehension. Or you could do the filtering inside the loop you already have that converts to integers. Or, again inside that loop, you could use a counter variable to keep track of how many integers you've converted, and print an error afterwards if it's 0. And so on. The main thing here is that you should get away from thinking about how to code something, but first work out what the steps should be, and only then code it. More on reddit.com

r/learnpython

7

1

December 8, 2022

How to remove empty dictionary value from list?

Yes the quotes (empty string) are considered values and you would use an if statement. Probably what I would suggest is a list comprehension:

[d for d in mylist if d['name']]

This creates a new list with each dictionary value in there if the value corresponding to the key 'name' is not an empty string. The empty string is a Falsey value in Python, so instead of checking if d['name'] != '' (which is also totally valid) you can just ask if d['name'].

More on reddit.com

r/learnpython

27

39

March 7, 2017

XPath is returning an empty list

Why am I getting an empty list? That's the result of your Xpath string not matching with anything. More on reddit.com

r/learnpython

5

3

February 20, 2018

Python - empty Lists getting initialized as noneType?

currSum.append(num) append returns None, as is idiomatic in Python for a mutating function. You should be modifying the list before calling the function if that is your intention. (Since you don't want help with the solution I'm not going to check whether this is pertinent, but FYI mutating parameters when you should be creating copies is a common recursion mistake.) More on reddit.com

r/learnprogramming

4

0

April 28, 2017

Videos

Checking for an empty list in Python

Python Program #54 - Check If a List is Empty in Python - YouTube

How to Check if a List is Empty in Python | Python Lists - YouTube

September 1, 2022

How to Make an Empty List in Python - Full Guide (2025) - YouTube

January 28, 2025

How to create an empty list in Python - YouTube

How Do You Create An Empty List In Python? | #thekiranacademy - ...

February 22, 2025

pythonmorsels.com › checking-for-an-empty-list-in-python

Checking for an empty list in Python - Python Morsels

August 20, 2024 - Many Python users prefer to check for an empty list by evaluating the list's truthiness. A non-empty list is truthy, and an empty list is falsey.

reddit.com › r/learnpython › how do i check if this list is "empty"?

r/learnpython on Reddit: How do I check if this list is "empty"?

December 8, 2022 -

I'm completely stumped on a computer science assignment because our lecturer has given us zero information. We're supposed to have the user input a list and check if the list is in decreasing order and print a suitable message if it is. That part works fine. However, if the list is "empty" (I'll explain the quotations in a second) then it should print the list is empty.

The problem is that, according to our brief we're supposed to use .split(",") in order to allow the user to separate their numbers with commas. The problem lies in the fact that even if a user hits enter without inputting anything, the list is still '1' long with just an empty string. I've been scouring the web to find out how to check if a list is empty. But all the tutorials have so far just been in relation to actually empty lists (as in, list = []). One did use the all() function to check that all items in the list were strings, which did work and let me print that the list is empty, but broke the original function. Could someone please help me I'm tearing my hair out with this.

--

def checkOrder():

# checks, etc.

integer_list = []

listLength = len(integer_list)

increasing = 0

decreasing = 0

singleValue = 0

# Converting inputted numbers into a split list

userInput = input("Please enter your numbers seperated by a comma (,):")

inputtedStrings = userInput.split(",")

for number in inputtedStrings:

inputtedIntegers = int(number)

integer_list.append(inputtedIntegers)

# Enumerating list

for i, val in enumerate(integer_list[:-1]):

if val <= integer_list[i+1]:

increasing = 1

elif val >= integer_list[i+1]:

decreasing = 1

# Check for a single value

if len(integer_list) == 1:

singleValue = 1

if len(integer_list) == 1 and

print("The list is empty.")

if increasing == 1:

print("The numbers are in increasing order.")

elif decreasing == 1 or singleValue == 1:

print("The numbers are in decreasing order.")

checkOrder()

--

Well there are a few ways you could deal with this. First would be to check if userInput is an empty string before converting it to a list. Another possibility would be to filter the list to remove all empty strings, eg via a list comprehension. Or you could do the filtering inside the loop you already have that converts to integers. Or, again inside that loop, you could use a counter variable to keep track of how many integers you've converted, and print an error afterwards if it's 0. And so on. The main thing here is that you should get away from thinking about how to code something, but first work out what the steps should be, and only then code it.

arr = [''] print(any(arr)) # False any and all are pretty useful built-in functions for iterative boolean checks.

freecodecamp.org › news › how-to-check-if-a-list-is-empty-in-python

Python isEmpty() equivalent – How to Check if a List is Empty in Python

April 19, 2023 - Comparing the list to an empty list. The not operator in Python is used for logical negation.

builtin.com › articles › python-check-if-list-is-empty

Python Check if a List Is Empty: A Guide | Built In

In this context, lists are considered truthy if they are non-empty, meaning that at least one argument was passed to the list. So, if you want to check if a list is empty, you can simply use the not operator.

datacamp.com › tutorial › python-empty-list

A Comprehensive Guide to Python Empty Lists | DataCamp

February 2, 2024 - Alternatively, Python provides a built-in function list() that, when called without any arguments, returns an empty list. This method is equally effective, though slightly more verbose.

Find elsewhere

Google Bing Mojeek

betterstack.com › community › questions › how-to-check-if-list-is-empty-in-python

How do I check if a list is empty in Python? | Better Stack Community

January 26, 2023 - If the length of the list is 0, then it is empty.

en.curict.com › item › 9a › 9a5983d.html

Checking if a Python list is empty

In Python, an empty sequence (an empty list) is considered False, so you can use the if not operator to check if a list is empty.

medium.com › swlh › efficiently-checking-for-an-empty-list-in-python-76b76099fbd3

Efficiently Checking for an Empty List in Python | by Frank Scholl | The Startup | Medium

November 22, 2019 - ... For sequences, (strings, lists, tuples), use the fact that empty sequences are false.Yes: if not seq: if seq: No: if len(seq): if not len(seq): Empirically, the best way to check for an empty list in Python is by implicit boolean conversion.

pavolkutaj.medium.com › how-to-check-if-a-list-dict-or-set-is-empty-in-python-as-per-pep8-35d8c64d07d0

How to Check if a List, Dict or Set is Empty in Python as per PEP8 | by Pavol Z. Kutaj | Medium

September 7, 2023 - see https://docs.python.org/3/reference/datamodel.html#object.__bool__ >>> a = [] >>> bool(a) False >>> a = [1] >>> bool(a) True · The canonical way of knowing if an array in C is empty is by dereferencing the first element and seeing if it is null, assuming an array that is nul-terminated.

flexiple.com › python › check-if-list-is-empty-python

Python isEmpty() equivalent – How to Check if a List is Empty in Python - Flexiple - Flexiple

March 14, 2022 - This method is concise and commonly ... in Python following PEP8 recommendations, the most Pythonic way is to use the implicit boolean evaluation of the list....

quora.com › How-do-I-check-if-a-list-is-empty-in-Python

How to check if a list is empty in Python - Quora

Answer (1 of 8): It is very easy to check whether a given list in python is empty or not. you just have to use the check if len(list) is null: print(“empty list”)

docs.vultr.com › python › examples › check-if-a-list-is-empty

Python Program to Check If a List is Empty | Vultr Docs

December 6, 2024 - Checking if a list is empty is a common task in Python programming, especially when dealing with data that varies in content. An empty list can signify that data is missing, not generated, or has been entirely consumed by previous operations.

askpython.com › home › check if a list is empty – 3 easy methods

Check if a List is Empty - 3 Easy Methods - AskPython

July 17, 2020 - If the len() function returns zero, the list is said to be empty.

geeksforgeeks.org › python › declare-an-empty-list-in-python

Declare an Empty List in Python - GeeksforGeeks

July 12, 2025 - Declaring an empty list in Python creates a list with no elements, ready to store data dynamically.

tutorialspoint.com › how-to-check-if-a-list-is-empty-in-python

How to check if a list is empty in Python?

April 23, 2025 - The list is empty if the list size equals zero. The following program checks whether the input list is empty or not using the __len__() function -

squash.io › how-to-check-if-list-is-empty-in-python

How To Check If List Is Empty In Python

December 21, 2023 - In this example, we define an empty list my_list and then use the len() function to check its length. If the length is equal to zero, we print "The list is empty". Otherwise, we print "The list is not empty".

Python documentation

docs.python.org › 3 › tutorial › datastructures.html

5. Data Structures — Python 3.14.3 documentation

Lists are mutable, and their elements are usually homogeneous and are accessed by iterating over the list. A special problem is the construction of tuples containing 0 or 1 items: the syntax has some extra quirks to accommodate these. Empty tuples are constructed by an empty pair of parentheses; a tuple with one item is constructed by following a value with a comma (it is not sufficient to enclose a single value in parentheses).

Python Engineer

python-engineer.com › posts › check-if-list-is-empty

How to check if a List is empty in Python - Python Engineer

Among other rules it defines that empty sequences and collections like '', (), [], {}, set(), range(0) are all considered false. Another way which also works but is not necessary is to check if the length is equal to 0: ... Although the first ...