Python Basics: Understanding Variables, Data Types, and Operators - tpointtech/Python GitHub Wiki

Python Basics: Understanding Variables, Data Types, and Operators

Python is one of the most popular programming languages today, known for its simplicity and versatility. Whether you are a beginner or looking to sharpen your coding skills, understanding variables, data types, and operators is essential. In this guide, we will cover the basics of these fundamental concepts in Python.

Python Basics: Understanding Variables, Data Types, and Operators

1. Variables in Python

A variable is a container for storing data values. Unlike other programming languages, Python does not require explicit declaration of variables; you can directly assign a value to a variable.

Example:

x = 10  # Integer variable
y = "Hello, Python!"  # String variable
z = 3.14  # Float variable

Python variables are dynamically typed, meaning you donโ€™t need to specify the data type explicitly. The interpreter automatically determines the type based on the assigned value.

2. Data Types in Python

Python provides various built-in data types to store different kinds of values. Some commonly used data types include:

a) Numeric Data Types

  • Integer (int): Whole numbers without a decimal point.
  • Float (float): Numbers with a decimal point.
  • Complex (complex): Numbers with a real and imaginary part.

Example:

num1 = 100  # int
decimal_number = 25.75  # float
complex_number = 3 + 4j  # complex

b) String Data Type (str)

Strings in Python are sequences of characters enclosed in single or double quotes.

name = "Tpoint Tech"
message = 'Welcome to Python Programming!'

c) Boolean Data Type (bool)

Boolean values represent either True or False.

is_python_fun = True
is_sky_green = False

d) Sequence Data Types

  • List (list): Ordered, mutable collection.
  • Tuple (tuple): Ordered, immutable collection.
  • Range (range): Sequence of numbers used in loops.

Example:

my_list = [1, 2, 3, "Python"]  # List
tuple_example = (10, 20, 30)  # Tuple
range_numbers = range(5)  # Range from 0 to 4

e) Dictionary (dict)

Dictionaries store key-value pairs.

student = {"name": "John", "age": 25, "course": "Python"}

3. Operators in Python

Operators are used to perform operations on variables and values. Python supports various types of operators:

a) Arithmetic Operators

Used for mathematical operations:

a = 10
b = 5
print(a + b)  # Addition
print(a - b)  # Subtraction
print(a * b)  # Multiplication
print(a / b)  # Division
print(a % b)  # Modulus (remainder)
print(a ** b)  # Exponentiation (power)
print(a // b)  # Floor Division

b) Comparison Operators

Used to compare values:

x = 10
y = 20
print(x == y)  # Equal to
print(x != y)  # Not equal to
print(x > y)  # Greater than
print(x < y)  # Less than

c) Logical Operators

Used for logical conditions:

x = True
y = False
print(x and y)  # Logical AND
print(x or y)  # Logical OR
print(not x)  # Logical NOT

d) Assignment Operators

Used to assign values to variables:

a = 10
a += 5  # Equivalent to a = a + 5
a -= 2  # Equivalent to a = a - 2

e) Membership Operators

Used to check if a value exists in a sequence:

my_list = [1, 2, 3, 4, 5]
print(3 in my_list)  # True
print(10 not in my_list)  # True

Conclusion

Understanding Python variables, data types, and operators is the foundation of Python programming. Mastering these concepts will help you build efficient and error-free code. Keep practicing and experimenting with these basics, and youโ€™ll be on your way to becoming a proficient Python programmer!

๐Ÿ“Œ Stay tuned for more Python tutorials from Tpoint Tech. Happy coding! ๐Ÿš€