Welcome! This channel is for anyone starting out with Python.
I'm learning too — just sharing what I know and picking up more along the way.
We'll cover the basics step by step, help each other, and have some fun doing it.
One day, we'll grow this into a full community of coders.
No stress. Just learning, curiosity, and progress.

❓ Questions & Help

If you have any questions about the lessons, PDFs, or Python in general, feel free to ask in this group (https://t.me/python_programming0).

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Introduction to Programming with Python

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What is Python?

Python is a popular programming language created by Guido van Rossum in 1991.

It is known for:
- Simplicity
- Readability
- Flexibility
- Powerful libraries

Python is beginner-friendly while still being powerful enough for AI, web development, and automation.

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What is Python Used For?

- Web Development
- Software Development
- Data Science & Mathematics
- Automation & System Scripting

Python works on multiple platforms:
- Windows
- Linux
- Mac
- Raspberry Pi

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Important Concept: Indentation

Unlike many programming languages that use { }, Python uses indentation (spaces) to define code blocks.

Example:

if 5 > 2:
    print("Five is greater than two")

Proper indentation is required in Python.

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Your First Python Program

print("Hello World")

This prints text to the screen.

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Reading User Input

Use the input() function to get data from users.

name = input("Please enter your name: ")

print(f"Hi {name}, nice to meet you!")

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Variables in Python

Variables are containers used to store data.

x = 5
y = "John"

Python automatically detects the data type.

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Casting

Casting is used to force a variable into a specific data type.

str(3)      # '3'
int(3.8)    # 3
float(3)    # 3.0

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Variable Naming Rules

- Must start with a letter or underscore _
- Cannot start with a number
- Can contain letters, numbers, and underscores
- Case-sensitive (age, Age, and AGE are different)
- Cannot use Python keywords like:
- if
- while
- print

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Naming Conventions

Camel Case:

myVariableName

Pascal Case:

MyVariableName

Snake Case (Recommended in Python):

my_variable_name

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Built-in Data Types

Python includes several built-in data types:

- Text → str
- Numeric → int, float, complex
- Sequence → list, tuple, range
- Mapping → dict
- Boolean → bool

Check a variable type using type():

print(type(5))

Output:

<class 'int'>

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Comments in Python

Comments make code easier to understand.

Single-line comment:

# This is a comment

Multi-line comment:

"""
This is a multi-line comment
"""

Control Structures and Loops in Python

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Conditional Statements

Conditional statements allow programs to make decisions based on conditions.

They help control the flow of a program by executing different code depending on whether a condition is True or False.

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Comparison Operators

| Operator | Meaning |
|----------|----------|
| == | Equal to |
| != | Not equal to |
| < | Less than |
| <= | Less than or equal to |
| > | Greater than |
| >= | Greater than or equal to |

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If, Elif, and Else

- if → checks the first condition
- elif → checks another condition if previous ones are False
- else → runs if none of the conditions are True

Example:

a = 200
b = 33

if b > a:
    print("b is greater than a")

elif a == b:
    print("a and b are equal")

else:
    print("a is greater than b")

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Logical Operators

Logical operators combine multiple conditions.

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AND Operator

Returns True only if both conditions are True.

a = 200
b = 33
c = 500

if a > b and c > a:
    print("Both conditions are satisfied")

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OR Operator

Returns True if at least one condition is True.

if a > b or a > c:
    print("At least one condition is True")

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NOT Operator

Reverses the result.

a = 33
b = 200

if not a > b:
    print("a is NOT greater than b")

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Loops in Python

Loops repeat code multiple times while a condition is met.

Python mainly uses:
- while loop
- for loop

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The While Loop

Executes repeatedly while the condition remains True.

i = 1

while i < 6:
    print(i)
    i += 1

Important:
Always update the loop variable to avoid infinite loops.

---

Break Statement

Stops the loop immediately.

i = 1

while i < 6:
    print(i)

    if i == 3:
        break

    i += 1

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Continue Statement

Skips the current iteration and continues with the next one.

i = 0

while i < 6:
    i += 1

    if i == 3:
        continue

    print(i)

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Else with Loops

The else block runs once when the loop condition becomes False.

i = 1

while i < 6:
    print(i)
    i += 1

else:
    print("Loop finished")

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The For Loop

A for loop is used to iterate through sequences such as:
- Lists
- Tuples
- Strings

Example:

fruits = ["apple", "banana", "cherry"]

for x in fruits:
    print(x)

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Practice Exercises

1. Write a program to check whether a number is positive, negative, or zero.

2. Print all even numbers from 1 to 20 using a loop.

3. Create a loop that stops when the number 5 is reached.

4. Loop through a string and print each character separately.