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Python - int Data Type

📌 What You Will Learn

Define the int data type and the values it stores
Write integer values in decimal, binary, octal, and hexadecimal form
Identify the prefixes used for binary, octal, and hexadecimal literals
Convert numbers between bases using bin(), oct(), and hex()
Explain why Python 3 uses only the int type for all integers

The int data type is used to store whole numbers (integers).

Integer values do not contain a decimal point.

Python supports both positive and negative integer values.

🐍Code Cell

1	a = 10
2
3	print(a)
4	print(type(a))

Output

In Python 2, there were two integer types:

int
long

In Python 3, there is no separate long data type.

All integer values, including very large numbers, are stored using the int data type.

Python allows integers to be written in four number systems.

Decimal
Binary
Octal
Hexadecimal

Decimal is the default number system in Python.

It uses digits from 0 to 9.

🐍Code Cell

1	a = 10
2
3	print(a)

Output

Binary numbers use only two digits:

A binary number must start with 0b or 0B.

🐍Code Cell

1	a = 0B1111
2
3	print(a)

Output

🐍Code Cell

a = 0B123

Output

SyntaxError

Octal numbers use digits from 0 to 7.

An octal number must start with 0o or 0O.

🐍Code Cell

1	a = 0o123
2
3	print(a)

Output

🐍Code Cell

a = 0o786

Output

SyntaxError

Hexadecimal numbers use:

Digits: 0–9
Letters: A–F or a–f

A hexadecimal number must start with 0x or 0X.

🐍Code Cell

1	a = 0XFACE
2	b = 0XBeef
3
4	print(a)
5	print(b)

Output

64206
48879

🐍Code Cell

1	a = 0XBeer

Output

SyntaxError

Programmers can write integers in decimal, binary, octal, or hexadecimal form.

However, Python always stores and displays integer values in decimal form.

🐍Code Cell

1	a = 10
2	b = 0o10
3	c = 0X10
4	d = 0B10
5
6	print(a)
7	print(b)
8	print(c)
9	print(d)

Output

Python provides built-in functions to convert numbers between different number systems.

The bin() function converts a number into binary format.

🐍Code Cell

1	print(bin(15))
2	print(bin(0o11))
3	print(bin(0X10))

Output

0b1111
0b1001
0b10000

The oct() function converts a number into octal format.

🐍Code Cell

1	print(oct(10))
2	print(oct(0B1111))
3	print(oct(0X123))

Output

0o12
0o17
0o443

The hex() function converts a number into hexadecimal format.

🐍Code Cell

1	print(hex(100))
2	print(hex(0B111111))
3	print(hex(0o12345))

Output

0x64
0x3f
0x14e5

🐍Code Cell

1	a = 10
2	b = 0B1010
3	c = 0O12
4	d = 0X0A
5
6	print(a)
7	print(b)
8	print(c)
9	print(d)

Output

Number System	Base	Prefix	Allowed Digits
Decimal	10	No Prefix	0-9
Binary	2	0b	0, 1
Octal	8	0o	0-7
Hexadecimal	16	0x	0-9, A-F, a-f

The int data type is immutable.
Python integers can store very large values.
Python automatically manages memory for integer objects.
Python supports decimal, binary, octal, and hexadecimal numbers.
Internally, integer values are displayed in decimal form.

The int data type stores whole numbers.
Python 3 uses only the int type for all integer values.
Binary numbers start with 0b.
Octal numbers start with 0o.
Hexadecimal numbers start with 0x.
Use bin(), oct(), and hex() for base conversions.

Topic	Description
Data Type	int
Stores	Whole Numbers
Decimal Prefix	No Prefix
Binary Prefix	0b
Octal Prefix	0o
Hexadecimal Prefix	0x
Conversion Functions	bin(), oct(), hex()
Mutable	No (Immutable)

📝 Key Takeaways

The int data type stores whole numbers
Binary literals start with 0b, octal literals with 0o, and hexadecimal literals with 0x
Python always stores and displays integer values in decimal form
Python 3 uses int for all integer values, including very large numbers
bin(), oct(), and hex() convert a number to binary, octal, and hexadecimal format

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Nearby lessons

Python - int Data Type

Introduction

Example

Important Note

Ways to Represent Integer Values

1. Decimal Number System (Base 10)

2. Binary Number System (Base 2)

Invalid Binary Example

3. Octal Number System (Base 8)

Invalid Octal Example

4. Hexadecimal Number System (Base 16)

Invalid Hexadecimal Example

How Python Stores Integer Values

Base Conversion Functions

1. bin() Function

2. oct() Function

3. hex() Function

Example Using Different Number Systems

Summary of Integer Number Systems

Important Points

Key Points

Quick Summary

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