A Brief Look at Python Built‑in Numeric Types (Including a Python 2 vs 3 Difference)

Python Built‑in Object Overview

Python treats every value as an object. Built‑in objects are divided into simple types (primarily numeric data) and container types (sequences, tuples, mappings). The special object None represents the empty value.

Simple type objects include int, long, float, complex, and bool. Container types include sequences such as string, list, tuple, and the mapping type dict. All objects expose attributes and methods accessed via the dot operator ( .).

Numeric Constants

Python numeric literals support several formats:

Decimal integers (e.g., 42)

Binary ( 0b1010), octal ( 0o52), and hexadecimal ( 0x2A) prefixes

Floating‑point numbers, including scientific notation ( 1.2e-3 or 1.2E-3)

Complex literals using a trailing j or J (e.g., 3+4j)

Fractional literals via the fractions.Fraction class (see the next section)

Division in Python 2 vs Python 3

In Python 2, the / operator performs integer division when both operands are integers, truncating the result (e.g., 5/2 == 2). When either operand is a float, the operation yields a float. Python 3 changes / to always perform true division, returning a float (e.g., 5/2 == 2.5). The floor‑division operator // returns the largest integer less than or equal to the true quotient, and % returns the remainder.

Fractions

The fractions.Fraction class represents rational numbers as a numerator and denominator. To use it, import the module and instantiate with two integers, e.g., Fraction(3, 4). Strings representing floating‑point numbers can also be converted to fractions.

Boolean Type

Boolean objects have two values: True and False. Empty data structures evaluate to False. Booleans are commonly used in conditional statements to control program flow.

Complex Numbers

A complex number consists of a real part and an imaginary part, the latter indicated by a trailing j or J. Complex numbers support the usual arithmetic operators, and the result of an operation between complex numbers remains a complex number.

Takeaway

Numeric types are fundamental to any programming language. Mastering Python's numeric literals, division semantics across versions, fractions, booleans, and complex numbers is essential, especially since differences between Python 2 and Python 3 frequently appear in interview questions.