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What is the difference between the __int__ and __index__ methods in Python 3?

stackoverflow.com › questions › 1898310 › what-is-the-difference-between-the-int-and-index-methods-in-python-3

See PEP 357: Allowing Any Object to be Used for Slicing.

The nb_int method is used for coercion and so means something fundamentally different than what is requested here. This PEP proposes a method for something that can already be thought of as an integer communicate that information to Python when it needs an integer. The biggest example of why using nb_int would be a bad thing is that float objects already define the nb_int method, but float objects should not be used as indexes in a sequence.

Edit: It seems that it was implemented in Python 2.5.

Answer from Alok Singhal on Stack Overflow

W3Schools

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Python int() Function

The int() function converts the specified value into an integer number. ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com · If you want to report an error, or ...

Python documentation

docs.python.org › 3 › library › functions.html

Built-in Functions — Python 3.14.3 documentation

1 month ago - If the argument is a number, the constructor serves as a numeric conversion like int and float. For a general Python object x, complex(x) delegates to x.__complex__(). If __complex__() is not defined then it falls back to __float__().

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Stack Overflow

stackoverflow.com › questions › 1898310 › what-is-the-difference-between-the-int-and-index-methods-in-python-3

casting - What is the difference between the __int__ and __index__ methods in Python 3? - Stack Overflow

Top answer

1 of 2

See PEP 357: Allowing Any Object to be Used for Slicing.

The nb_int method is used for coercion and so means something fundamentally different than what is requested here. This PEP proposes a method for something that can already be thought of as an integer communicate that information to Python when it needs an integer. The biggest example of why using nb_int would be a bad thing is that float objects already define the nb_int method, but float objects should not be used as indexes in a sequence.

Edit: It seems that it was implemented in Python 2.5.

2 of 2

I believe you'll find the answer in PEP 357, which has this abstract:

This PEP proposes adding an nb_index slot in PyNumberMethods and an __index__ special method so that arbitrary objects can be used whenever integers are explicitly needed in Python, such as in slice syntax (from which the slot gets its name).

Python Reference

python-reference.readthedocs.io › en › latest › docs › functions › int.html

int — Python Reference (The Right Way) 0.1 documentation

Returns an expression converted into an integer number.

Interactive Chaos

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int | Interactive Chaos

Python scenarios · Full name · int · Library · Built-in · Syntax · class int([n]) class int(n, base=10) Description · The int function returns an integer from a number or a string, or returns the value 0 if no argument is included. If the argument is not a number or if a base is added ...

Python

peps.python.org › pep-0237

PEP 237 – Unifying Long Integers and Integers | peps.python.org

February 1, 2025 - Python currently distinguishes between two kinds of integers (ints): regular or short ints, limited by the size of a C long (typically 32 or 64 bits), and long ints, which are limited only by available memory.

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Google Bing Mojeek

reddit.com › r/python › __int__ vs __init__

r/Python on Reddit: __int__ vs __init__

December 12, 2022 -

2h of debuging to then find out this is the problem. I so damn hate my life. How does intellij not help there. Its highlighted in the same color. OMG I am so angry

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215

innit ---> best choice if you're British

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118

_int_ implements the built in int() function. They're both dunder methods. Dont blame intellij lol (also why intellij instead of pycharm..)

Codecademy

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Python | Built-in Functions | int() | Codecademy

September 3, 2021 - Takes in a value that can be converted into an integer, and returns a copy of the value in the int datatype.

Pierian Training

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Python Tutorial: How to take an integer input in Python - Pierian Training

April 12, 2023 - In Python, we can take input from the user using the `input()` function. The `input()` function reads a line of text entered by the user and returns it as a string. To take an integer input, we need to convert the string input to an integer.

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tutorialsteacher.com › python › python-number-type

Python Numbers: int, float, complex (With Examples)

In Python, integers are zero, positive or negative whole numbers without a fractional part and having unlimited precision, e.g. 0, 100, -10.

IncludeHelp

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Python int() Function: Use, Syntax, and Examples

December 7, 2024 - The int() function is a library function in Python, it is used to convert a string (that should contain a number/integer), number (integer, float) into an integer value.

Medium

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Python’s integer (int) type | by Tue Nguyen | Medium

April 15, 2022 - Python’s integer (int) type Python uses int to represent integers (or whole numbers) such as 10, 100, or -30. Create an integer We can create an int variable through an assignment with an integer …

Mimo

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Mimo: The coding platform you need to learn Web Development, Python, and more.

Integer, or int, is a data type in Python that represents whole numbers without a decimal point.

GeeksforGeeks

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Python int() Function - GeeksforGeeks

September 26, 2025 - The Python int() function converts a given object to an integer or converts a decimal (floating-point) number to its integer part by truncating the fractional part.

Scaler

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int() Function in Python - Scaler Topics

June 29, 2024 - Learn about int() Function in Python by Scaler Topics. To convert a specified value (any number or string) into an integer object, we use int in python.

ZetCode

zetcode.com › python › int-builtin

Python int Function - Complete Guide

April 11, 2025 - This comprehensive guide explores Python's int function, which converts values to integers.

FastAPI

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Python Types Intro - FastAPI

def get_name_with_age(name: str, age: int): name_with_age = name + " is this old: " + str(age) return name_with_age · You just saw the main place to declare type hints. As function parameters. This is also the main place you would use them with FastAPI. You can declare all the standard Python ...

Python documentation

docs.python.org › 3 › library › stdtypes.html

Built-in Types — Python 3.14.3 documentation

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Python

docs.python.org › 3 › c-api › long.html

Integer Objects — Python 3.14.3 documentation

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