to check whether x is True or False:
Copybool("")
> False
bool("x")
> True
for details on the semantics of is and == see this question
Top answer 1 of 5
7
to check whether x is True or False:
Copybool("")
> False
bool("x")
> True
for details on the semantics of is and == see this question
2 of 5
5
Am I supposed to conclude that x is neither True nor False?
That's right. x is neither True nor False, it is "". The differences start with the type:
Copy>>> print(type(""), type("x"), type(True), type(False))
builtins.str, builtins.str, builtins.bool, builtins.bool
Python is a highly object oriented language. Hence, strings are objects. The nice thing with python is that they can have a boolean representation for if x: print("yes"), e. g.. For strings this representation is len(x)!=0.
Sololearn
sololearn.com › en › Discuss › 1779570 › is-an-empty-string-true-or-false-in-python-3
Is an empty string true or false in python 3 | Sololearn: Learn to code for FREE!
Saksham Jain Both ''==False and '' ==True are False because an empty string is not a boolean expression. It has a boolean value which can be found out with bool(''). But an empty string is not equivalent to False.
Videos
01:47
How to Identify Empty & Non-Empty Strings in Python | NareshIT ...
02:26
How to Check if a String is Empty in Python - YouTube
04:14
Python Empty Strings Explained: 5 Simple Methods & When to Use ...
07:35
How To Check If String Is Empty Python - YouTube
00:55
What is Falsy in Python? - Python Tips w/ Anaconda - YouTube
06:15
Python 3 Basics # 3.4 | How to check empty string in Python - YouTube
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 - In this article, you have learned different ways to check if the string is empty or not in Python. Since empty strings are considered as false in Python, we can directly use it on the if condition to check or use it with either not operator ...
GeeksforGeeks
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 len() function returns the length of a string so if the length is 0, it means that string is empty: ... The string is empty. ... If len(s) == 0 then the string is empty. In Python, empty strings are treated as "Falsy".
TutorialsPoint
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?
In Python, empty strings are considered as falsy, Which evaluates to false in a boolean content.
Wyzant
wyzant.com › resources › ask an expert
Most elegant way to check if the string is empty in Python? | Wyzant Ask An Expert
May 22, 2019 - The empty string is the only possible zero-length string. All other strings return True. An if statement in Python must have a Boolean argument. So you don't have to write "if bool(myString)". "if myString" is syntactic sugar for calling bool(myString). Also, you don't have to explicitly write ...
Python.org
discuss.python.org › python help
.Empty string comprehension? - Python Help - Discussions on Python.org
March 14, 2020 - Hello everyone , I wrote this code ... return person a = person_infos('fna', 'lna', age=34) print(a) The variable age in the function definition is an empty string , but we when set age as a number ( age = 4 ) no error happens , ...
Sentry
sentry.io › sentry answers › python › check if a string is empty in python
Check if a string is empty in Python | Sentry
In Python, empty strings are considered equivalent to False for boolean operations.
Better Stack
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
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 to be True:
Syntax Scenarios
syntaxscenarios.com › python › check-if-a-string-is-empty
How to Check if a String is Empty in Python? – Syntax Scenarios
Python’s bool() function evaluates the truth value of an object. In the case of an empty string, bool() will return False, and for non-empty strings, it will return True.
Esri Community
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 - From 6. Expressions - Python 3.y.z documentation: In the context of Boolean operations, and also when expressions are used by control flow statements, the following values are interpreted as false: False, None, numeric zero of all types, and empty strings and containers (including strings, ...
Reddit
reddit.com › r/learnpython › empty string returns true upon checking if its contained in a non empty string
r/learnpython on Reddit: empty string returns True upon checking if its contained in a non empty string
June 7, 2025 -
This code is meant to count all the words that have the expression "di" but with the text "imagina." the final answer is 1.
texto = 'imagina.'
cl = 0
flag_di = False
answer = 0
previous = ''
for car in texto:
if car != ' ' and car != '.':
cl += 1
if car in 'iI' and previous in 'dD':
flag_di = True
previous = car
else:
if car == ' ' or car == '.':
if flag_di:
answer += 1
cl = 0
flag_di = False
previous = ''
print(answer) Top answer 1 of 5
8
Yes, empty strings are in any other string. Like the empty set is a subset of any other set. I feel like there’s probably many easier ways to do what you’re trying to do here (which seems to be looking for the string “di” within another string without case sensitivity?) but to minimize the change to your approach, if you want to initialize previous so it returns false without raising a type error, you could initialize it with a long string that can’t possibly be in the search string. After the first iteration it will be set by the loop code and won’t be empty again.
2 of 5
2
The “empty string” bit isn’t what’s tripping you up, your loop is hand-checking for a ‘d’ then an ‘i’. In "imagina." there’s never a ‘di’ sequence, so flag_di stays False and you should get 0. If you’re seeing 1, double-check that you’re resetting flag_di and previous properly when you hit the delimiter. As a shortcut, you could also do: words = texto.strip('.').split() answer = sum('di' in w.lower() for w in words) print(answer)
PythonHow
pythonhow.com › how › check-if-a-string-is-empty
Here is how to check if a string is empty in Python
The 'not' operator returns True if the string is empty and False if it is not. ... In Python, you can check if a string is empty by using the 'not' operator as shown in the code above.
Reddit
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!
Top answer 1 of 4
6
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.
2 of 4
4
if variable in (None, ""): ... That'll do the trick .
30 Seconds of Code
30secondsofcode.org › home › python › string is empty
How can I check if a string is empty in Python? - 30 seconds of code
August 5, 2022 - In this context, strings are considered truthy if they are non-empty, meaning they contain at least one character. Thus, simply using the not operator, you can check if a string is empty. empty_string = '' non_empty_string = 'Hello' not empty_string ...
Top answer 1 of 16
3161
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.
2 of 16
565
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.
Astral
docs.astral.sh › ruff › rules › compare-to-empty-string
compare-to-empty-string (PLC1901) | Ruff
This rule is unstable and in preview. The --preview flag is required for use. Checks for comparisons to empty strings. An empty string is falsy, so it is unnecessary to compare it to "". If the value can be something else Python considers falsy, such as None, 0, or another empty container, ...
datagy
datagy.io › home › python posts › python strings › how to check if a string is empty in python
How to Check if a String is Empty in Python • datagy
December 16, 2022 - Empty strings in Python are considered to be falsy, meaning that they evaluate to False.
LabEx
labex.io › tutorials › python-how-to-check-if-a-string-is-empty-in-python-559577
How to Check If a String Is Empty in Python | LabEx
In Python, an empty string is considered "falsy," meaning that when used in a boolean context (such as an if statement), it evaluates to False. Non-empty strings, on the other hand, are considered "truthy" and ...
Studytonight
studytonight.com › post › how-to-check-for-an-empty-string
How to check if string is empty in Python? - Studytonight
May 3, 2023 - You can check if a string is empty in Python using the not operator, which returns True if the string is empty and False otherwise.