Python Programming Tutorial Notes

Introduction

• Learn Python for data science, machine learning, web development.
• No prior knowledge required.
• Instructor: Mosh Hamedani.
• New videos released weekly on the channel.

What You Can Do with Python

• Multi-purpose language:
  • Machine learning and AI (top choice for projects)
  • Web development (popular framework: Django)
    • Websites using Django: YouTube, Instagram, Spotify, Dropbox, Pinterest.
  • Automation: save time and increase productivity.

Installing Python

1. Go to python.org to download the latest version.
2. Check "Add Python to PATH" during installation on Windows.
3. Install a code editor (recommended: PyCharm).
   • Get it from jetbrains.com.
   • Download the free Community Edition.
4. Set up your first project in PyCharm:
   • Create a new project and add a Python file.

First Python Code

• Write a simple program:

  print("Hello, World!")
  

• Explanation:
  • print is a built-in function to output messages.
  • Strings should be enclosed in quotes (single or double).

Variables in Python

• Variables are used to store data:
  • Example:

    age = 20
    

• Print variable values:

  print(age)
  

• Variable naming:
  • Use underscores for readability (e.g., first_name).
  • Case sensitive (e.g., True, False).

User Input

• Use the input() function to read user input:

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

Data Types

• Basic types:
  • Numbers (integers & floats)
  • Strings
  • Booleans (True/False)
• Type conversion functions:
  • int(), float(), str(), bool()

Arithmetic Operations

• Basic operators: +, -, *, /
• Division operators:
  • Single slash (returns float)
  • Double slash (returns integer)
  • Modulus (%) for remainder.
  • Exponentiation (**).

Comparison Operators

• Used to compare values:
  • >, <, >=, <=, ==, !=

Logical Operators

• Combine multiple conditions:
  • and, or, not

If Statements

• Make decisions in code:

  if temperature > 30:
      print("It's a hot day")
  elif temperature > 20:
      print("It's a nice day")
  else:
      print("It's cold")
  

Loops

• While Loops: Repeat code while a condition is true.

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

• For Loops: Iterate over a sequence.

  for num in range(5):
      print(num)
  

Lists

• To store sequences:

  names = ["John", "Bob", "Alice"]
  

• Methods: append(), insert(), remove(), clear().
• Use in operator to check for existence.
• Length of a list: len(list).

Tuples

• Like lists but immutable:

  numbers = (1, 2, 3)
  

• Methods: count(), index().

Conclusion

• Python offers a range of functionalities, making it versatile for various applications.
• Further learning available at codewoodmosh.com for comprehensive courses.