python check if string is empty or none - Brave Search

How to check if the string is empty in Python?

stackoverflow.com › questions › 9573244 › how-to-check-if-the-string-is-empty-in-python

Empty strings are "falsy" (python 2 or python 3 reference), which means they are considered false in a Boolean context, so you can just do this:

if not myString:

This is the preferred way if you know that your variable is a string. If your variable could also be some other type then you should use:

if myString == "":

See the documentation on Truth Value Testing for other values that are false in Boolean contexts.

Answer from Andrew Clark on Stack Overflow

reddit.com › r/learnpython › what's the most pythonic way of checking if variable is none or empty string ""?

r/learnpython on Reddit: What's the most pythonic way of checking if variable is None or empty string ""?

July 6, 2021 -

I'm trying to constantly check against any of those values but I don't want to keep repeating myself in code.

if variable is None or variable == "": do stuff

What are my options? Can I create somehow a class and check against that class?

if variable is MyNewClass: do stuff

How would I write such a class?

Thanks!

Both None and "" are falsy values so simply if not variable: will cover both those cases. This doesn't explicitly check for those values but if you're just checking for something not being set this is probably the way to go.

if variable in (None, ""): ... That'll do the trick .

stackoverflow.com › questions › 9573244 › how-to-check-if-the-string-is-empty-in-python

How to check if the string is empty in Python? - Stack Overflow

Empty strings are "falsy" (python 2 or python 3 reference), which means they are considered false in a Boolean context, so you can just do this:

if not myString:

This is the preferred way if you know that your variable is a string. If your variable could also be some other type then you should use:

if myString == "":

See the documentation on Truth Value Testing for other values that are false in Boolean contexts.

From PEP 8, in the “Programming Recommendations” section:

For sequences, (strings, lists, tuples), use the fact that empty sequences are false.

So you should use:

if not some_string:

or:

if some_string:

Just to clarify, sequences are evaluated to False or True in a Boolean context if they are empty or not. They are not equal to False or True.

Discussions

Best way to do a "not None" test in Python for a normal and Unicode empty string? - Stack Overflow

Check the length of the returned value, and if it's an instance of unicode. ... # Works for normal empty strings <-- WRONG if string is not None: print "string is not an empty string." In Python 2.7.1, "" is not None evaluates to True - so string="" results in string is not an empty string ... More on stackoverflow.com

stackoverflow.com

Script Editor - If statement - String is NULL

Hi everybody, I needed to compare a string with NULL or see if the string is empty. I tried the python function .isNull() >> doesn’t works. I tried isNull(string_to_compare) >> doesn’t works. Finally I founded: if (string_to_compare == None): else: Trying to help, More on forum.inductiveautomation.com

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April 21, 2022

Python: String empty or null?

Hey guys, one maybe very easy question: I try to check if a string item is empty, therefore I try it with: if len(ir.getItem(presenceLightAlter).state.StringValue()) > 0: But I get an error, because the item state is NULL and so there is no string value. How can I check both, if it is NULL or empty? More on community.openhab.org

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February 25, 2021

What’s the cleanest way to do a python check if string is empty? - TestMu AI Community

I’m trying to figure out the most Pythonic way to handle a python check if string is empty. Right now, I’m doing this: if my_string == “”: It works, but I’m wondering if there’s a more elegant or built-in way, something like string.empty in other languages. More on community.testmuai.com

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July 3, 2025

Videos

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How to Check if a String is Empty in Python - YouTube

Python - Check If String is None, Empty or Whitespace in One Line!!!

Python 3 Basics # 3.4 | How to check empty string in Python - YouTube

Check if a String is Empty in Python - YouTube

November 7, 2025

stackabuse.com › how-to-check-if-a-string-is-empty-or-none-in-python

How to Check if a String is Empty or None in Python

June 5, 2023 - The not operator in the second example negates the "truthiness" or "falsiness" of the string, making the code slightly more concise. This is a common Pythonic way to check for empty strings. In Python, to check if a string is None, it's best practice to use the is operator rather than the == ...

geeksforgeeks.org › python › python-program-to-check-if-string-is-empty-or-not

Check if String is Empty or Not - Python - GeeksforGeeks

July 11, 2025 - The string is empty. Explanation: A simple equality check (s == "") determines if the string is empty.

sentry.io › sentry answers › python › check if a string is empty in python

Check if a string is empty in Python | Sentry

May 15, 2023 - if my_string.strip() == "": print("my_string is an empty string!") else: print("my_string is not an empty string!") Sentry BlogPython Performance Testing: A Comprehensive Guide (opens in a new tab) Syntax.fmListen to the Syntax Podcast (opens ...

Spark By {Examples}

sparkbyexamples.com › home › python › check if string is empty or not in python

Check if String is Empty or Not in Python - Spark By {Examples}

May 21, 2024 - Using if not my_string: implicitly checks if the string is empty or evaluates to False. It’s a more idiomatic way to check for emptiness. Versatility: The if not my_string: approach works not only for empty strings but also for any falsy values.

community.esri.com › t5 › python-questions › quot-if-not-null-and-not-empty-string-quot-paradox › td-p › 1618009

Solved: "If not Null and not empty string" paradox - help ... - Esri Community

May 29, 2025 - Your original logic is also evaluating to True if the sate is both None and not an empty string (which is always True) ... From both a practice ( https://peps.python.org/pep-0008/ ) and performance perspective, checking for None should be done using "is" or "is not".

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pythonhow.com › how › check-if-a-string-is-empty

Here is how to check if a string is empty in Python

In Python, you can check if a string is empty by using the 'not' operator as shown in the code above. You can also use the 'len' function that returns the number of characters in a string. If the number of characters is 0, then the string is empty. my_string = "" if len(my_string) == 0: ...

labex.io › tutorials › python-how-to-check-if-a-value-is-none-or-empty-in-python-559594

How to Check If a Value Is None or Empty in Python | LabEx

We learned to check for None using the is operator and to check for emptiness in strings and lists using the if not condition, as empty strings and lists evaluate to False in a boolean context.

stackoverflow.com › questions › 5690491 › best-way-to-do-a-not-none-test-in-python-for-a-normal-and-unicode-empty-string

Best way to do a "not None" test in Python for a normal and Unicode empty string? - Stack Overflow

Empty strings are considered false.

if string:
    # String is not empty.
else:
    # String is empty.

You never want to use is with anything that isn't guaranteed to be a singleton. Check the length of the returned value, and if it's an instance of unicode.

geeksforgeeks.org › python › python-check-if-nonetype-or-empty

Python Check if Nonetype or Empty - GeeksforGeeks

July 23, 2025 - In this example, below code processes a list `my_list` with elements (None, an empty string, and 42). It iterates through each item, printing whether it's of type None, an empty string, or neither.

tutorialspoint.com › What-is-the-most-elegant-way-to-check-if-the-string-is-empty-in-Python

What is the most elegant way to check if the string is empty in Python?

April 21, 2025 - Let's look at the following example, where we are going to use the basic way to check whether the string is empty or not. str1 = "" if not str1: print("It Is Empty.") else: print("It Is Not Empty.") ... The string is empty. The Python len() function is used to determine the length of an object ...

Inductive Automation

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Script Editor - If statement - String is NULL - Ignition - Inductive Automation Forum

April 21, 2022 - I tried the python function .isNull() >> doesn’t works. I tried isNull(string_to_compare) >> doesn’t works. Finally I founded: if (string_to_compare == None): else: Trying to help,

openHAB Community

community.openhab.org › setup, configuration and use › scripts & rules

Python: String empty or null? - Scripts & Rules - openHAB Community

February 25, 2021 - Hey guys, one maybe very easy question: I try to check if a string item is empty, therefore I try it with: if len(ir.getItem(presenceLightAlter).state.StringValue()) > 0: But I get an error, because the item state is…

TestMu AI Community

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What’s the cleanest way to do a python check if string is empty? - TestMu AI Community

July 3, 2025 - I’m trying to figure out the most Pythonic way to handle a python check if string is empty. Right now, I’m doing this: if my_string == “”: It works, but I’m wondering if there’s a more elegant or built-in way, somethi…

quora.com › How-do-I-check-if-the-string-is-empty-in-Python

How to check if the string is empty in Python - Quora

Answer (1 of 15): You can check it with a very simple if execution. Let us say, if you want to check pure empty string (must not contain even whitespaces), then you can do just like below: [code]if not string: print("Empty") [/code]Or, if you want to consider string with no character (but may ...

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

How to check if the string is empty in Python? | Better Stack Community

February 3, 2023 - To check if a string is empty in Python, you can use the len() function. For example: ... Alternatively, you can use the bool() function to check if the string is empty. An empty string is considered to be False, and all other strings are considered ...

quora.com › Does-Python-have-something-like-an-empty-string-variable-where-you-can-do-if-myString-string-empty-Regardless-whats-the-most-elegant-way-to-check-for-empty-string-values

Does Python have something like an empty string variable where you can do if myString == string.empty? Regardless, what's the most elegant way to check for empty string values? - Quora

Answer (1 of 3): I would test noneness before stripping. Also, I would use the fact that empty strings are False (or Falsy). This approach is similar to Apache's StringUtils.isBlank or Guava's Strings.isNullOrEmpty This is what I would use to test if a string is either None OR Empty OR Blank: [...

Syntax Scenarios

syntaxscenarios.com › python › check-if-a-string-is-empty

How to Check if a String is Empty in Python? – Syntax Scenarios

December 13, 2024 - In Python, it’s written as two quotes with nothing in between: "". On the other hand, a null string doesn’t exist at all, and a blank string might only appear empty but could contain spaces or invisible characters. ... This code shows three types of strings: an empty string (emptyString = ""), a string with spaces (blankString = " "), and a null value (nullString = None).

medium.com › @Hichem_MG › check-if-a-variable-is-not-none-in-python-3d6407798dec

Check if a variable is not None in Python | Medium

June 13, 2024 - Checking if a variable is truthy can mistakenly pass `0`, `False`, or empty collections. ... variable = 0 if variable: print("Variable is not None and is truthy") else: print("Variable is None or falsy") # Output: Variable is None or falsy · Always use `is not None` for explicit `None` checks to avoid confusion and ensure clarity in your code. Checking if a variable is not None is a fundamental practice in Python programming.