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