📝 Python Assignment Statements: Complete Guide

Introduction to Assignment Statements

An assignment statement is a fundamental concept in Python programming used to set a value to a variable name. During the lifetime of a program, assignment statements allow variables to hold different types of values. It stores the value at a memory location which can be identified or referred to by the variable name.

Assignment statements are very common in programming and are used frequently. They form the foundation of how data is stored and manipulated in Python.

📌 Topics covered in this article:
1. Syntax
2. Assignment Statement Forms
   2.1 Basic Form
   2.2 Tuple Assignment
   2.3 List Assignment
   2.4 Sequence Assignment
   2.5 Extended Sequence Unpacking
   2.6 Multiple-Target Assignment (Chain Assignment)
   2.7 Augmented Assignment

1. Syntax of Assignment Statement

The symbol = is used in an assignment statement and is called the assignment operator.

# Basic Syntax
variable = expression

# Examples
a = 50           # Assign integer 50 to variable a
b = 34.25        # Assign float 34.25 to variable b
a = 25           # Reassign value 25 to variable a (a now holds 25)

2.1 Basic Form

This is one of the most common forms of assignment statements. Here, the variable name is defined, initialized, and assigned a value in the same statement. This form is generally used when we want to use the variable multiple times and do not want to change its value frequently.

# Basic Form Example
language = "python"
print("Language =", language)

# Output:
# Language = python

2.2 Tuple Assignment

In Python, if we need to define and assign values for more than one variable at the same time, tuple assignment is useful. This is an easy method that saves time. Each individual variable gets a different value assigned to it.

# Tuple Assignment Examples
language1, language2 = "python", "java"
a, b = 30, 40

print("Language1 =", language1)
print("Language2 =", language2)
print("a =", a)
print("b =", b)

# Output:
# Language1 = python
# Language2 = java
# a = 30
# b = 40

2.3 List Assignment

List assignment works in the same way as tuple assignment.

# List Assignment Example
[v1, v2] = [12, 14]

print('v1 =', v1)
print('v2 =', v2)

# Output:
# v1 = 12
# v2 = 14

2.4 Sequence Assignment

In recent versions of Python, tuple and list assignment have been generalized into what we now call sequence assignment. Python assigns items in the sequence on the right to variables in the sequence on the left by position.

# Sequence Assignment Example
a, b, c, d, e, f = 'Python'

print('a =', a)
print('b =', b)
print('c =', c)
print('d =', d)
print('e =', e)
print('f =', f)

# Output:
# a = P
# b = y
# c = t
# d = h
# e = o
# f = n

2.5 Extended Sequence Unpacking

Extended sequence unpacking allows us to be more flexible in how we select portions of a sequence to assign. Using the star operator (*), it's possible to have different numbers of elements on each side of the assignment operator.

# Extended Sequence Unpacking Example
p, *q = 'Python Programming'

print('p =', p)
print('q =', q)

# Output:
# p = P
# q = ['y', 't', 'h', 'o', 'n', ' ', 'P', 'r', 'o', 'g', 'r', 'a', 'm', 'm', 'i', 'n', 'g']

2.6 Multiple-Target Assignment (Chain Assignment)

Multiple-target assignment assigns a reference to the same object (the rightmost object) to all targets on the left.

# Multiple-Target Assignment (Chain Assignment)
x = y = 75

print(x, y)

# Output:
# 75 75

2.7 Augmented Assignment

Augmented assignment is a shorthand assignment that combines an expression and an assignment.

# Augmented Assignment Example
x = 2

# Equivalent to: x = x + 1
x += 1

print(x)

# Output:
# 3

# Other augmented assignment forms:
# -=, *=, /=, //=, %=, **=, &=, |=, ^=, <<=, >>=

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