Call dict with no parameters
Copynew_dict = dict()
or simply write
Copynew_dict = {}
Answer from Jan Vorcak on Stack OverflowGeeksforGeeks
geeksforgeeks.org › python › initialize-an-empty-dictionary-in-python
Initialize an Empty Dictionary in Python - GeeksforGeeks
July 15, 2025 - Empty dictionary is also created by dict() built-in function without any arguments.
Why does my empty dictionary not evaluate to false?
Because an empty dictionary is not equal to false. In a boolean context, it's falsey (treated as false), but that's different from it literally comparing as the same as false. I keep thinking if a list or dictionary is empty it automatically evaluates to none. No, it's just equal to an empty list/dictionary. It will only evaluate to None if you use it in an expression like: {} or None # None More on reddit.com
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2
December 21, 2022Why is it common in python to make an empty list or dict first?
In your case it’s completely useless however many times we run a loop and append to a list or add to a variable counter or many such things. This has to exist before we do so. I mean I thought a lot of list comprehension was supposed to help mitigate this very thing lol. for element in some_list: my_list.append(element*2) Will fail. More on reddit.com
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165
September 19, 2023Videos
01:03
How to create empty Dictionary in Python - YouTube
00:27
Create an Empty Dictionary in Python - YouTube
Python Tutorial for Beginners | Create an 'Empty Dictionary' in ...
02:51
How to Create Empty Dictionary in Python and add Items? Python ...
08:39
How to check if a dictionary is empty in Python | Check if a ...
freeCodeCamp
freecodecamp.org › news › create-a-dictionary-in-python-python-dict-methods
Create a Dictionary in Python – Python Dict Methods
March 14, 2022 - The first way is by using a set of curly braces, {}, and the second way is by using the built-in dict() function. To create an empty dictionary, first create a variable name which will be the name of the dictionary.
Python documentation
docs.python.org › 3 › tutorial › datastructures.html
5. Data Structures — Python 3.14.6 documentation
It is best to think of a dictionary as a set of key: value pairs, with the requirement that the keys are unique (within one dictionary). A pair of braces creates an empty dictionary: {}. Placing a comma-separated list of key:value pairs within ...
Mimo
mimo.org › glossary › python › dictionary-dict-function
Python Dictionary: Syntax and Examples [Python Tutorial]
You can also create a dictionary using the dict() function and passing key-value pairs as keyword arguments. Using dict() without any arguments creates an empty dictionary.
Top answer 1 of 8
1279
Empty dictionaries evaluate to False in Python:
>>> dct = {}
>>> bool(dct)
False
>>> not dct
True
>>>
Thus, your isEmpty function is unnecessary. All you need to do is:
def onMessage(self, socket, message):
if not self.users:
socket.send("Nobody is online, please use REGISTER command" \
" in order to register into the server")
else:
socket.send("ONLINE " + ' ' .join(self.users.keys()))
2 of 8
259
Here are three ways you can check if dict is empty. I prefer using the first way only though. The other two ways are way too wordy.
test_dict = {}
if not test_dict:
print "Dict is Empty"
if not bool(test_dict):
print "Dict is Empty"
if len(test_dict) == 0:
print "Dict is Empty"
FavTutor
favtutor.com › blogs › empty-dictionary-python
Create Empty Dictionary in Python (5 Easy Ways) | FavTutor
April 13, 2022 - If no arguments are provided, an empty dictionary is created. ... In Python, we can use the zip() and len() methods to create an empty dictionary with keys.
Google
developers.google.com › google for education › python › python dict and file
Python Dict and File | Python Education | Google for Developers
The "del" operator can remove variables, list elements, or entries from a dictionary. The open() function is used to open files for reading ('r'), writing ('w'), or appending ('a'), with iterating through the file handle being an efficient way ...
GeeksforGeeks
geeksforgeeks.org › python › python-check-if-dictionary-is-empty
Check if dictionary is empty in Python - GeeksforGeeks
July 11, 2025 - The original dictionary : {} Is dictionary empty ? : True · This task can also be performed using the not operator that checks for a dictionary existence, this evaluates to True if any key in the dictionary is not found. Python ·
Reddit
reddit.com › r/learnpython › why does my empty dictionary not evaluate to false?
r/learnpython on Reddit: Why does my empty dictionary not evaluate to false?
December 21, 2022 -
dict_a = {}
print(dict_a)
print(dict_a == False)
print(bool(dict_a) == False)Why do we need the bool function to check whether a sequence is empty not not? I keep thinking if a list or dictionary is empty it automatically evaluates to none. So why do we need to explicitly check the boolean of an object?
Top answer 1 of 4
2
Because an empty dictionary is not equal to false. In a boolean context, it's falsey (treated as false), but that's different from it literally comparing as the same as false. I keep thinking if a list or dictionary is empty it automatically evaluates to none. No, it's just equal to an empty list/dictionary. It will only evaluate to None if you use it in an expression like: {} or None # None
2 of 4
1
:dict_a does not equal False, and dict_a={1:"data"} does not equal True. Use dict_a={} if dict_a: ## shorthand for if len(dict_a) > 0 print("True") else: print("False")
Reddit
reddit.com › r/python › why is it common in python to make an empty list or dict first?
r/Python on Reddit: Why is it common in python to make an empty list or dict first?
September 19, 2023 -
Something I've never understood with python is why it is so common for an empty list to be created and then populated with something in a subsequent (or even more common next) line:
my_list = [] my_list = [i for i in range(1, 21)]
Obviously this is a really really toy example, but I'm consistently finding this in "production" code in multiple places. Is it pythonic? It's basically pure duplication so I doubt it. Is it some hacky "optimisation"? Is it a side effect of the code priorly being a for loop, then turned to a list comprehension but not tidied up right?
I honestly just feel ike I'm missing something key, with the amount of times and variety of places I see this pattern.
Top answer 1 of 59
295
In your case it’s completely useless however many times we run a loop and append to a list or add to a variable counter or many such things. This has to exist before we do so. I mean I thought a lot of list comprehension was supposed to help mitigate this very thing lol. for element in some_list: my_list.append(element*2) Will fail.
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That is not common at all tbh. You might see initialized to empty if you need to append. For example: ‘’’ coros = [] for f in functions: if f.__name__.startswith(“get”) and validate(f): coros.append(f) await asyncio.gather(*coros) ‘’’ Now, you can do that with a list comprehension but it becomes difficult to read, and the result is the same.
ItSolutionstuff
itsolutionstuff.com › post › python-dictionary-check-if-value-is-empty-exampleexample.html
Python Dictionary Check if Value is Empty Example - ItSolutionstuff.com
October 30, 2023 - userDictionary = { "ID": 1, "name": "", "email": "hardik@gmail.com" } # Check value is empty or not in dictionary if userDictionary["name"]: print("value is not empty.") else: print("value is empty.")
Protocol Buffers
protobuf.dev › programming-guides › proto3
Language Guide (proto 3) | Protocol Buffers Documentation
If you provide a key but no value for a map field, the behavior when the field is serialized is language-dependent. In C++, Java, Kotlin, and Python the default value for the type is serialized, while in other languages nothing is serialized.
Python.org
discuss.python.org › ideas
Add the ability to declare an empty dict as `{:}` - Page 2 - Ideas - Discussions on Python.org
March 29, 2023 - In my opinion, the fact that {} declares an empty dict is a major design flaw. Empty curly braces should only be associated with the empty set. If a newcomer learns that [] declares an empty list, their intuition would …
Sololearn
sololearn.com › en › Discuss › 3028941 › empty-dictlist-as-argument-best-practice
empty dict/list as argument: best practice?
May 7, 2022 - sl_scroll_/de/Discuss/2848516/how-is-python-used-in-the-ai-artificial-intelligence-fieldPending
Quora
quora.com › How-do-you-declare-an-empty-dictionary-in-Python
How to declare an empty dictionary in Python - Quora
which tells the class is dict. Thanks for reading!!!
GitHub
github.com › nlohmann › json
GitHub - nlohmann/json: JSON for Modern C++ · GitHub
Intuitive syntax. In languages such as Python, JSON feels like a first-class data type. We used all the operator magic of modern C++ to achieve the same feeling in your code.
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FastAPI
fastapi.tiangolo.com › tutorial › body
Request Body - FastAPI
For example, this model above declares a JSON "object" (or Python dict) like:
PhoenixNAP
phoenixnap.com › home › kb › devops and development › how to initialize dictionary in python
How to Initialize Dictionary in Python
April 1, 2026 - Add items to the dictionary as needed using a method of your choice. For example, append a new key-value pair using the assignment operator to append the data to the initialized empty dictionary. ... After reading this guide, you know several different ways to initialize a Python dictionary.
Python documentation
docs.python.org › 3 › library › functions.html
Built-in Functions — Python 3.14.6 documentation
The bases tuple contains the base classes and becomes the __bases__ attribute; if empty, object, the ultimate base of all classes, is added. The dict dictionary contains attribute and method definitions for the class body; it may be copied or wrapped before becoming the __dict__ attribute.