week 1

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Week 1: Introduction to Python

Setting up Python & Development Environment

1. Checking Python Version

   import sys
   print(sys.version)

2. Installing a Package using pip

   pip install requests

3. Running a Simple Python Script

   print("Hello, Python!")

4. Using Virtual Environments

   python -m venv my_env
   source my_env/bin/activate  # On macOS/Linux
   my_env\Scripts\activate     # On Windows

5. Using IDLE (Python’s Built-in IDE)

   python -m idlelib

6. Checking Installed Packages

   import pkg_resources
   installed_packages = {pkg.key: pkg.version for pkg in pkg_resources.working_set}
   print(installed_packages)

7. Writing a Python Script and Running It Create hello.py:

   print("Hello, World!")

   Run it:

   python hello.py

8. Basic REPL (Read-Eval-Print Loop) Usage

   python
   >>> 5 + 3

9. Installing Jupyter Notebook

   pip install notebook
   jupyter notebook

10. Running Python from a Jupyter Notebook

    print("Running Python in Jupyter Notebook!")

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Basic Syntax, Data Types, and Variables

1. Declaring Variables

   name = "Alice"
   age = 25
   height = 5.6
   is_python_dev = True

2. Using type() Function

   print(type(name))  # <class 'str'>
   print(type(age))   # <class 'int'>
   print(type(height))  # <class 'float'>
   print(type(is_python_dev))  # <class 'bool'>

3. String Formatting

   name = "Alice"
   age = 25
   print(f"My name is {name} and I am {age} years old.")

4. Arithmetic Operations

   a, b = 10, 3
   print(a + b)  # Addition
   print(a - b)  # Subtraction
   print(a * b)  # Multiplication
   print(a / b)  # Division
   print(a // b)  # Floor division
   print(a % b)  # Modulus
   print(a ** b)  # Exponentiation

5. Multi-line Strings

   message = """This is a multi-line string.
   It spans multiple lines.
   """
   print(message)

6. Boolean Logic

   x, y = True, False
   print(x and y)  # False
   print(x or y)  # True
   print(not x)  # False

7. User Input

   name = input("Enter your name: ")
   print(f"Hello, {name}!")

8. Type Casting

   num = "10"
   num_int = int(num)
   print(num_int + 5)  # 15

9. String Slicing

   text = "PythonProgramming"
   print(text[0:6])  # Python
   print(text[-3:])  # ing

10. Checking Variable Scope

def func():
    x = 10
    print(x)  # Local variable

func()
# print(x)  # This would cause an error since x is local

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