Python is one of the world's most popular and beginner-friendly programming languages. Used in web development, data science, artificial intelligence, automation, and more — Python's clean, readable syntax makes it an ideal first language for aspiring programmers. This tutorial will guide you through your first Python steps: variables, data types, operators, and control flow.

You can practice all the examples in this tutorial right in your browser using our Try Python tool — no installation needed!

Why Learn Python?

Before we dive in, let's understand why Python is such a popular choice:

• Easy to read: Python code looks almost like plain English, making it easy to understand.
• Versatile: Used in web development (Django, Flask), data science (Pandas, NumPy), AI/ML (TensorFlow, PyTorch), and automation.
• Large community: Massive ecosystem of libraries and a supportive community.
• High demand: Python developers are among the most sought-after in the job market.
• Free and open source: Python is completely free to use and distribute.

Your First Python Program

Let's start with the classic "Hello, World!" program. In Python, it's just one line:

print("Hello, World!")

The print() function displays output to the screen. Simple, right? Try typing this in our Try Python editor and click Run!

Variables and Assignment

Variables are used to store data. In Python, you don't need to declare the type of a variable — Python figures it out automatically:

# Creating variables
name = "Alice"
age = 25
height = 5.6
is_student = True

print(name)       # Alice
print(age)        # 25
print(height)     # 5.6
print(is_student) # True

Variable names should be descriptive, start with a letter or underscore, and use lowercase with underscores for multiple words (e.g., first_name, total_price).

Python Data Types

Python has several built-in data types:

1. Strings (str)

Strings are sequences of characters enclosed in single or double quotes:

greeting = "Hello, Python!"
language = 'Python'

# String operations
print(len(greeting))           # 15 (length)
print(greeting.upper())        # HELLO, PYTHON!
print(greeting.replace("Hello", "Hi")) # Hi, Python!

# f-strings (modern way to format strings)
name = "Alice"
age = 25
print(f"My name is {name} and I am {age} years old.")

2. Numbers (int and float)

# Integers (whole numbers)
x = 10
y = -5
z = 0

# Floats (decimal numbers)
pi = 3.14159
temperature = -17.5

# Arithmetic operations
print(10 + 3)   # Addition: 13
print(10 - 3)   # Subtraction: 7
print(10 * 3)   # Multiplication: 30
print(10 / 3)   # Division: 3.3333...
print(10 // 3)  # Integer division: 3
print(10 % 3)   # Modulus (remainder): 1
print(2 ** 8)   # Power: 256

3. Booleans (bool)

is_raining = True
is_sunny = False

print(10 > 5)    # True
print(10 == 10)  # True
print(10 != 5)   # True
print(10 < 5)    # False

4. Lists

Lists store multiple items in a single variable:

fruits = ["apple", "banana", "cherry"]
numbers = [1, 2, 3, 4, 5]
mixed = ["hello", 42, 3.14, True]

print(fruits[0])      # apple (first item)
print(fruits[-1])     # cherry (last item)
print(len(fruits))    # 3

fruits.append("mango") # Add to end
fruits.remove("banana")# Remove item
print(fruits)          # ['apple', 'cherry', 'mango']

Control Flow: if / elif / else

Control flow lets your program make decisions:

age = 18

if age < 13:
    print("Child")
elif age < 18:
    print("Teenager")
elif age == 18:
    print("Just turned adult!")
else:
    print("Adult")

# Output: Just turned adult!

Note: Python uses indentation (spaces or tabs) to define code blocks. This is not optional — it's part of Python's syntax.

Loops

for loops

# Iterate over a list
fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

# Use range() for number sequences
for i in range(5):
    print(i)  # Prints 0, 1, 2, 3, 4

# range(start, stop, step)
for i in range(1, 10, 2):
    print(i)  # Prints 1, 3, 5, 7, 9

while loops

count = 0
while count < 5:
    print(f"Count: {count}")
    count += 1  # Increment count

# Output: Count: 0, Count: 1, ..., Count: 4

Functions

Functions let you organize and reuse code:

def greet(name):
    """This function greets a person by name."""
    return f"Hello, {name}! Welcome to Python."

# Call the function
message = greet("Alice")
print(message)  # Hello, Alice! Welcome to Python.

# Function with default parameter
def greet(name, language="Python"):
    return f"Welcome to {language}, {name}!"

print(greet("Bob"))              # Welcome to Python, Bob!
print(greet("Carol", "Java"))  # Welcome to Java, Carol!

What's Next?

Congratulations! You now know the fundamentals of Python. Here's what to learn next:

• Dictionaries and Sets — More data structures for storing key-value pairs.
• File I/O — Reading and writing files with Python.
• Object-Oriented Programming — Classes and objects in Python.
• Libraries — Explore NumPy, Pandas, Matplotlib for data science.
• Web Frameworks — Learn Django or Flask for web development.