Python Tutorial by Mosh Hamedani

Introduction

• Target audience: Beginners with no prior coding experience
• Applications of Python:
  • Data Science
  • Machine Learning
  • Web Development
  • Automation
• Flexible use cases demonstrated by popular sites like YouTube, Instagram, etc.

Setup

1. Download Python: Go to python.org and download the latest version
2. Install Python: Complete the installation, making sure to add Python to PATH on Windows
3. Install Code Editor: Recommended editor: PyCharm
   • Download from jetbrains.com
   • Use the free Community Edition
   • Install and configure PyCharm
4. Create a New Project: Name your project and create a new Python file
5. Write and Run Code: Example - print("Hello World")
6. Using Terminal: Viewing the output in the terminal window

Basics of Python

Variables

• Declaration: Example age = 20
• Printing Variables: print(age)
• Types of Data:
  • Numbers: Integers and floats
  • Strings: Textual data surrounded by quotes
  • Booleans: True or False
• Examples: price = 19.95, first_name = "John"
• Modification: Variables can be reassigned new values

Input from User

• input Function: Reading input from terminal
• Example: name = input("What is your name?") print("Hello " + name)
• Type Conversions:
  • int(x), float(x), bool(x), str(x)
• Calculator Example: Addition of two numbers

Working with Strings

• String Methods:
  • .upper(), .lower(), .find(), .replace()
• String Operations: Combining and manipulating text sequences
• Use of in Operator: Check for substrings
• Example: course = "Python for Beginners" print(course.upper())

Arithmetic Operations

• Basic Operators: +, -, *, /
• Special Division Operators: single vs double slashes
• Modulus: % (Remainder)
• Exponent: **
• Examples: 10 + 3 10 // 3 10 ** 3
• Operator Precedence: Parentheses to change order

Comparison and Logical Operators

• Comparison Operators: >, <, >=, <=, ==, !=
• Logical Operators: and, or, not
• Example: price = 25 print(price > 10 and price < 30)

Control Structures

If Statements

• Syntax: if condition: # block of code elif condition: # another block else: # default block
• Example: Decision making based on temperature

While Loops

• Syntax: i = 1 while i <= 5: print(i) i += 1

For Loops

• Iterating Over Lists: for item in [1, 2, 3]: print(item)
• Using range Function: for number in range(5): print(number)

Data Structures

Lists

• Definition: Using square brackets []
• Basic Operations:
  • Accessing and modifying elements
  • Slicing
  • Methods: .append(), .insert(), .remove(), .clear()
• Iteration: Looping through lists

Tuples

• Immutable Lists: Using parentheses ()
• Why Use Tuples: Ensuring data integrity when immutability is needed
• Example: numbers = (1, 2, 3) print(numbers[0]) # prints 1

Summary and Further Learning

• Code with Mosh: Further courses available online
  • Comprehensive Python course link below video