⚙️ Python Operators & Expressions: A Practical Guide

What Are Operators and Expressions?

In Python, an operator is a symbol that tells the interpreter to perform a specific mathematical, logical, or other operation. An expression is a combination of values, variables, and operators that evaluates to a single value.

Think of operators as verbs in a sentence — they act on data (operands) to produce results. For example, in a + b, the + is the operator, and a and b are operands.

# Simple expressions
x = 10 + 5      # addition expression
y = x * 2       # multiplication expression
is_greater = x > y  # comparison expression
                                

1. Arithmetic Operators

Arithmetic operators are used to perform mathematical operations like addition, subtraction, multiplication, etc. They work on numeric values (int, float, complex).

a = 10
b = 3

print("Addition:", a + b)        # 13
print("Subtraction:", a - b)     # 7
print("Multiplication:", a * b)  # 30
print("Division:", a / b)        # 3.333...
print("Floor Division:", a // b) # 3
print("Modulus:", a % b)         # 1
print("Exponent:", a ** b)       # 1000
                                

2. Assignment Operators

Assignment operators are used to assign values to variables. The most common is =, but there are also compound assignment operators that combine arithmetic with assignment.

x = 5       # simple assignment
x += 3      # same as x = x + 3 → x = 8
x -= 2      # x = x - 2 → 6
x *= 2      # x = x * 2 → 12
x /= 4      # x = x / 4 → 3.0
x //= 2     # x = x // 2 → 1
x **= 3     # x = x ** 3 → 1
                                

3. Comparison (Relational) Operators

Comparison operators compare two values and return a Boolean (True or False). They are fundamental in decision-making and loops.

a = 10
b = 20

print("Equal:", a == b)         # False
print("Not Equal:", a != b)     # True
print("Greater:", a > b)        # False
print("Less:", a < b)           # True
print("Greater or Equal:", a >= b) # False
print("Less or Equal:", a <= b) # True
                                

4. Logical Operators

Logical operators (and, or, not) are used to combine conditional statements. They return Boolean values.

x = True
y = False

print("x and y:", x and y)  # False
print("x or y:", x or y)    # True
print("not x:", not x)      # False
                                

5. Bitwise Operators

Bitwise operators act on bits and perform operations bit-by-bit. They are useful in low-level programming, cryptography, and performance optimization.

a = 5   # binary: 0101
b = 3   # binary: 0011

print("Bitwise AND:", a & b)  # 1 (0001)
print("Bitwise OR:", a | b)   # 7 (0111)
print("Bitwise XOR:", a ^ b)  # 6 (0110)
print("Bitwise NOT:", ~a)     # -6
print("Left Shift:", a << 1)  # 10 (1010)
print("Right Shift:", a >> 1) # 2 (0010)
                                

6. Special Operators

Python has two special operators: identity (is, is not) and membership (in, not in). They are used to check object identity and membership in sequences.

# Identity operators
a = [1, 2, 3]
b = [1, 2, 3]
c = a

print(a is b)   # False (different objects)
print(a is c)   # True (same object)

# Membership operators
fruits = ["apple", "banana", "cherry"]
print("apple" in fruits)   # True
print("grape" not in fruits) # True
                                

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📚 Where to Go From Here

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