100 Python Examples: A Step-by-Step Guide

#Python #Programming #Tutorial #LearnPython

Part 1: The Basics (Examples 1-15)

#1. Print "Hello, World!"
The classic first program. print() is a function that outputs text to the console.

print("Hello, World!")

Hello, World!

#2. Variables and Strings
Store text in a variable and print it.

message = "I am learning Python."
print(message)

I am learning Python.

#3. Integer Variable
Store a whole number.

age = 30
print("My age is:", age)

My age is: 30

#4. Float Variable
Store a number with a decimal point.

price = 19.99
print("The price is:", price)

The price is: 19.99

#5. Boolean Variable
Store a value that is either True or False.

is_learning = True
print("Am I learning?", is_learning)

Am I learning? True

#6. Get User Input
Use the input() function to get information from the user.

name = input("What is your name? ")
print("Hello, " + name)

What is your name? Alice
Hello, Alice

#7. Simple Calculation
Perform a basic arithmetic operation.

a = 10
b = 5
print(a + b)

15

#8. Comments
Use # to add comments that Python will ignore.

# This line calculates the area of a rectangle
length = 10
width = 5
area = length * width
print("Area is:", area)

Area is: 50

#9. Type Conversion (String to Integer)
Convert a user's input (which is a string) to an integer to perform math.

age_str = input("Enter your age: ")
age_int = int(age_str)
next_year_age = age_int + 1
print("Next year you will be:", next_year_age)

Enter your age: 25
Next year you will be: 26

#10. String Concatenation
Combine multiple strings using the + operator.

first_name = "John"
last_name = "Doe"
full_name = first_name + " " + last_name
print(full_name)

John Doe

#11. Multiple Assignment
Assign values to multiple variables in one line.

x, y, z = 10, 20, 30
print(x, y, z)

10 20 30

#12. The type() Function
Check the data type of a variable.

num = 123
text = "hello"
pi = 3.14
print(type(num))
print(type(text))
print(type(pi))

<class 'int'>
<class 'str'>
<class 'float'>

#13. Basic Arithmetic Operators
Demonstrates addition, subtraction, multiplication, and division.

a = 15
b = 4
print("Addition:", a + b)
print("Subtraction:", a - b)
print("Multiplication:", a * b)
print("Division:", a / b)

Addition: 19
Subtraction: 11
Multiplication: 60
Division: 3.75

#14. Floor Division and Modulus
// for division that rounds down, and % for the remainder.

a = 15
b = 4
print("Floor Division:", a // b)
print("Modulus (Remainder):", a % b)

Floor Division: 3
Modulus (Remainder): 3

#15. Exponentiation
Use ** to raise a number to a power.

power = 3 ** 4  # 3 to the power of 4
print(power)

81

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Part 2: String Manipulation (Examples 16-25)

#16. String Length
Use len() to get the number of characters in a string.

my_string = "Python is fun"
print(len(my_string))

13