What is the fastest way to check if a class has a function defined?

|

👻 Check our latest review to choose the best laptop for Machine Learning engineers and Deep learning tasks!

I"m writing an AI state space search algorithm, and I have a generic class which can be used to quickly implement a search algorithm. A subclass would define the necessary operations, and the algorithm does the rest.

Here is where I get stuck: I want to avoid regenerating the parent state over and over again, so I have the following function, which returns the operations that can be legally applied to any state:

def get_operations(self, include_parent=True):
    ops = self._get_operations()
    if not include_parent and self.path.parent_op:
        try:
            parent_inverse = self.invert_op(self.path.parent_op)
            ops.remove(parent_inverse)
        except NotImplementedError:
            pass
    return ops

And the invert_op function throws by default.

Is there a faster way to check to see if the function is not defined than catching an exception?

I was thinking something on the lines of checking for present in dir, but that doesn"t seem right. hasattr is implemented by calling getattr and checking if it raises, which is not what I want.

👻 Read also: what is the best laptop for engineering students?

We hope this article has helped you to resolve the problem. Apart from What is the fastest way to check if a class has a function defined?, check other hasattr-related topics.

Want to excel in Python? See our review of the best Python online courses 2022. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:



Julia Emmerson

New York | 2022-11-28

Simply put and clear. Thank you for sharing. What is the fastest way to check if a class has a function defined? and other issues with hasattr was always my weak point 😁. Checked yesterday, it works!

Jan Sikorski

Shanghai | 2022-11-28

Simply put and clear. Thank you for sharing. What is the fastest way to check if a class has a function defined? and other issues with StackOverflow was always my weak point 😁. Will use it in my bachelor thesis

Dmitry Schteiner

Massachussetts | 2022-11-28

Maybe there are another answers? What What is the fastest way to check if a class has a function defined? exactly means?. I am just not quite sure it is the best method

Shop

Learn programming in R: courses

$

Best Python online courses for 2022

$

Best laptop for Fortnite

$

Best laptop for Excel

$

Best laptop for Solidworks

$

Best laptop for Roblox

$

Best computer for crypto mining

$

Best laptop for Sims 4

$

Latest questions

NUMPYNUMPY

Common xlabel/ylabel for matplotlib subplots

12 answers

NUMPYNUMPY

How to specify multiple return types using type-hints

12 answers

NUMPYNUMPY

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

12 answers

NUMPYNUMPY

Flake8: Ignore specific warning for entire file

12 answers

NUMPYNUMPY

glob exclude pattern

12 answers

NUMPYNUMPY

How to avoid HTTP error 429 (Too Many Requests) python

12 answers

NUMPYNUMPY

Python CSV error: line contains NULL byte

12 answers

NUMPYNUMPY

csv.Error: iterator should return strings, not bytes

12 answers

News


Wiki

Python | How to copy data from one Excel sheet to another

Common xlabel/ylabel for matplotlib subplots

Check if one list is a subset of another in Python

sin

How to specify multiple return types using type-hints

exp

Printing words vertically in Python

exp

Python Extract words from a given string

Cyclic redundancy check in Python

Finding mean, median, mode in Python without libraries

cos

Python add suffix / add prefix to strings in a list

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

Python - Move item to the end of the list

Python - Print list vertically