There is no "invalid argument" or "null pointer" built-in exception in Python. Instead, most functions raise TypeError (invalid type such as NoneType) or ValueError (correct type, but the value is outside of the accepted domain).
If your function requires an object of a particular class and gets None instead, it should probably raise TypeError as you pointed out. In this case, you should check for None explicitly, though, since an object of correct type may evaluate to boolean False if it implements __nonzero__/__bool__:
if MyArg2 is None:
raise TypeError
Python docs:
TypeErrorpython2 / python3ValueErrorpython2 / python3
Medium
medium.com › @kiranbjm › what-is-a-null-pointer-exception-de351fb907e7
What is a Null Pointer Exception? | by Kiran Benny Joseph | Medium
October 26, 2024 - A NullPointerException happens when your code tries to access properties, methods, or functions on a variable that hasn’t been assigned a…
Top answer 1 of 7
101
There is no "invalid argument" or "null pointer" built-in exception in Python. Instead, most functions raise TypeError (invalid type such as NoneType) or ValueError (correct type, but the value is outside of the accepted domain).
If your function requires an object of a particular class and gets None instead, it should probably raise TypeError as you pointed out. In this case, you should check for None explicitly, though, since an object of correct type may evaluate to boolean False if it implements __nonzero__/__bool__:
if MyArg2 is None:
raise TypeError
Python docs:
TypeErrorpython2 / python3ValueErrorpython2 / python3
2 of 7
3
As others have noted, TypeError or ValueError would be natural. If it doesn't seem specific enough, you could subclass whichever of the two exceptions is a better fit. This allows consistent handling of invalid arguments for a broad class of functions while also giving you more detail for the particular function.
Null Pointer Exception in Python client upon redefining a rule without undefining it before
Description @flyingsilverfin : as discussed... define schema define rule queries both from console and python client are OK redefine same rule query from console OK, python client throws null point... More on github.com
1
May 4, 2021NullPointerException when running any Python script
name: NullPointerException when running any Python script about: When attempting to run the attached Python script, or indeed any Python script, in Ghidra, a NullPointerException matching the outpu... More on github.com
11
February 4, 2020NullPointerException during processing
I am using python to do batch processing. I used level 1C sentinel 2 images. After the process has been processed have been performed in several images for some unexpected reason it stucks (image attached). Any ideas? More on forum.step.esa.int
0
0
August 29, 2018Python Object Reader (deprecated) - Null Pointer Exception:null
Hi! Please help, I’ve been trying to send an email and encountered this error, It works perfectly fine before so I tried checking the preference for python then added file path again manually, however the same error still exist. When I tried searching the python object reader (deprecated) ... More on forum.knime.com
1
0
March 21, 2021NullPointerException Explained - YouTube
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Reddit
reddit.com › r/pygame › anyone know why i keep getting this error and what a null pointer is?
Anyone know why i keep getting this error and what a null pointer is? : r/pygame
January 17, 2024 - I recommend you check the documentation for that zip call in your for loop and run the debugger to see what’s happening with that line variable. I expect the ‘line’ variable is not getting assigned a value at some point during that for loop. ... line can't not have a value, and what does an empty object even mean? NULL is not even a Python concept, this seems like an internal pygame error and the error message is simply confusing
Python
docs.python.org › 2.0 › ext › nullPointers.html
1.10.4 NULL Pointers
It is better to test for NULL only at the ``source'', i.e. when a pointer that may be NULL is received, e.g. from malloc() or from a function that may raise an exception. The macros Py_INCREF() and Py_DECREF() do not check for NULL pointers -- however, their variants Py_XINCREF() and Py_XDECREF() do.
GitHub
github.com › typedb › typedb › issues › 6311
Null Pointer Exception in Python client upon redefining a rule without undefining it before · Issue #6311 · typedb/typedb
May 4, 2021 - Description @flyingsilverfin : as discussed... define schema define rule queries both from console and python client are OK redefine same rule query from console OK, python client throws null point...
Author: typedb
Python
docs.python.org › 2.0 › ext › errors.html
1.2 Intermezzo: Errors and Exceptions
An important convention throughout the Python interpreter is the following: when a function fails, it should set an exception condition and return an error value (usually a NULL pointer). Exceptions are stored in a static global variable inside the interpreter; if this variable is NULL no exception ...
Examples-of
examples-of.com › technology-software › common-errors-debugging-examples › null-pointer-exceptions › technology-software-common-errors-debugging-examples-null-pointer-exceptions-how-to-identify-null-pointer-exceptions-in-python
Identifying Null Pointer Exceptions in Python
You may encounter a Null Pointer Exception when trying to access user attributes without ensuring the User object is properly initialized. class User: def __init__(self, name): self.name = name user = None # Simulating a situation where user is not initialized ## Attempting to print the user's name try: print(user.name) except AttributeError as e: print(f"Error: {e}") # This will catch the Null Pointer Exception
Bytes
bytes.com › topic › python › answers › 20124-null-pointer-exceptions
null pointer exceptions - Python
July 18, 2005 - Your requests are coming too fast. Please slow down your access rate to continue browsing our site
GitHub
github.com › NationalSecurityAgency › ghidra › issues › 1513
NullPointerException when running any Python script · Issue #1513 · NationalSecurityAgency/ghidra
February 4, 2020 - Describe the bug When attempting to run the attached Python script, or indeed any Python script, in Ghidra, a NullPointerException matching the output attached is thrown.
Author: NationalSecurityAgency
STEP Forum
forum.step.esa.int › development › python
NullPointerException during processing - python - STEP Forum
August 29, 2018 - I am using python to do batch processing. I used level 1C sentinel 2 images. After the process has been processed have been performed in several images for some unexpected reason it stucks (image attached). Any ideas…
Python
docs.python.org › 2.0 › api › exceptionHandling.html
4. Exception Handling
It is important to understand some of the basics of Python exception handling. It works somewhat like the Unix errno variable: there is a global indicator (per thread) of the last error that occurred. Most functions don't clear this on success, but will set it to indicate the cause of the error on failure. Most functions also return an error indicator, usually NULL if they are supposed to return a pointer, or -1 if they return an integer (exception: the PyArg_Parse*() functions return 1 for success and 0 for failure).
KNIME Community
forum.knime.com › knime extensions
Python Object Reader (deprecated) - Null Pointer Exception:null - KNIME Extensions - KNIME Forum Archive
March 21, 2021 - Hi! Please help, I’ve been trying to send an email and encountered this error, It works perfectly fine before so I tried checking the preference for python then added file path again manually, however the same error still exist. When I tried searching the python object reader (deprecated) in the node repository it renders no result so I tried adding the node again and the error was that Knime Python Integration extension is not installed, so I tried installing it but then again it says that thi...
Learnsic
learnsic.com › blog › understanding-null-pointer-exception
Understanding Null Pointer Exception
March 29, 2024 - This website uses cookies to ensure you get the best experience & by continuing to use our website, you agree to our Privacy and Cookie Policy · Got it
Yale
neuron.yale.edu › board index › neuron design › neuron + python
Null pointer error when trying to access the pointer through python - www.neuron.yale.edu
post1 = [] num_receptors = 1000 for i in range(num_receptors): r = h.gabaa() r.loc(0.5, sec=dopa.soma) r.C = gaba.axon[68].T_rel post1.append(r) Its giving this error: C:\Users\verma\OneDrive\Automated_model>python 1synaptic_py.py 1 1 1 1 1 Traceback (most recent call last): File "C:\Users\verma\OneDrive\Automated_model\1synaptic_py.py", line 43, in <module> r.C = gaba.axon[68].T_rel AttributeError: POINTER is NULL How can I do this right?
Python
docs.python.org › 3 › c-api › exceptions.html
Exception Handling — Python 3.14.7 documentation
It is important to understand some of the basics of Python exception handling. It works somewhat like the POSIX errno variable: there is a global indicator (per thread) of the last error that occurred. Most C API functions don’t clear this on success, but will set it to indicate the cause of the error on failure. Most C API functions also return an error indicator, usually NULL if they are supposed to return a pointer, or -1 if they return an integer (exception: the PyArg_* functions return 1 for success and 0 for failure).
STEP Forum
forum.step.esa.int › development › python
java.lang.NullPointerException at Slice Assembly - python - STEP Forum
July 31, 2018 - I was calling my python code for 2017 S1 data, and it worked fine. Then I started doing it for 2018 and it did well for first few months but then it started to have this problem: target_4 = GPF.createProduct(“SliceAssembly”, parameters, products) RuntimeError: org.esa.snap.core.gpf.Ope...
Sonar Community
community.sonarsource.com › sonarqube cloud
SonarScanner NullPointerException on python scripts with invalid binary characters - SonarQube Cloud - Sonar Community
April 9, 2024 - We have a python script that we use to test cases where files have invalid binary characters. Unfortunately the scanner throws an error while parsing it. While this is not ideal code, the python interpreter is working fine so the issue is with the scanner. [2024-04-08T23:03:23.941Z] ERROR: Parse error at line 781 column 77: [2024-04-08T23:03:23.941Z] [2024-04-08T23:03:23.941Z] 777: ) [2024-04-08T23:03:23.941Z] 778: except FileNotFoundError: [2024-04-08T23:03:23.941Z] 779: ...
NxtWave
ccbp.in › blog › articles › null-in-python
Null in Python: Understanding and Handling Null Values
January 27, 2025 - In many languages, null represents a pointer that doesn't point to any object, indicates when a variable is uninitialised, or marks default parameters that haven't been provided yet. However, there is no Null in Python, but the concept of null ...
Hacker News
news.ycombinator.com › item
Everything in Python is a reference, and there's no null pointer issues. | Hacker News
January 12, 2020 - AttributeError: 'NoneType' object has no attribute 'foo' Not to mention UnboundLocalError and cases of AttributeError that stem from trying to use attributes before they've been initialized. Some of these have slightly better ergonomics than Java’s pernicious null initialization, for example ...