Introduction to Python Syntax

Python Syntax

Python has a straightforward and readable syntax that emphasizes code readability.

Here are some key elements of Python syntax:

Comments

Comments are used to add explanatory notes within the code. They are not executed by the interpreter.

In Python, single-line comments start with the # symbol, and multiline comments are enclosed between triple quotes (''' or """).

# This is a single-line comment

'''
This is a multiline comment.
It can span multiple lines.
'''

Indentation

Python uses indentation to define the structure and scope of code blocks.

It replaces traditional braces or brackets used in other programming languages.

Indentation is typically four spaces or a tab.

if x > 0:
    print("x is positive")  # This code block is indented
else:
    print("x is non-positive")  # This code block is indented the same way

Variables

Variables are used to store values in Python. You can assign a value to a variable using the assignment operator (=).

x = 10  # Assigns the value 10 to the variable x
name = "John"  # Assigns the string "John" to the variable name

Data Types

Python has several built-in data types, including:

• Numbers: Integers (int), floating-point numbers (float), and complex numbers (complex).

• Strings: Ordered sequences of characters enclosed in single quotes (') or double quotes (").

• Lists: Ordered and mutable collections of items enclosed in square brackets ([]).

• Tuples: Ordered and immutable collections of items enclosed in parentheses (()).

• Dictionaries: Unordered collections of key-value pairs enclosed in curly braces ({}).

• Sets: Unordered collections of unique items enclosed in curly braces ({}).

# Examples of different data types
age = 25  # integer
pi = 3.14159  # float
name = "John"  # string
fruits = ['apple', 'banana', 'orange']  # list
coordinates = (10, 20)  # tuple
student = {'name': 'Alice', 'age': 20}  # dictionary

Operators

Python supports various operators for performing operations on variables and values.

These include arithmetic operators (+, -, *, /, %, **), comparison operators (<, >, ==, !=, <=, >=), logical operators (and, or, not), and more.

# Examples of operators
x = 5 + 3  # addition
y = 10 - 2  # subtraction
z = 2 * 4  # multiplication
w = 16 / 2  # division
remainder = 7 % 3  # modulo
power = 2 ** 3  # exponentiation

is_equal = x == y  # equality comparison
is_greater = x > y  # greater than comparison

is_true = True and False  # logical AND
is_false = True or False  # logical OR
is_not = not True  # logical NOT

Conditional Statements

Conditional statements allow you to perform different actions based on specific conditions.

Python uses the if, elif (optional), and else keywords for conditional branching.

# Example of a conditional statement
x = 10

if x > 0:
    print("x is positive")
elif x == 0