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Showing posts with the label Free Python Course

Lists in Python

In Python, a list is a versatile and widely-used data structure that allows you to store an ordered collection of items. Lists are mutable, meaning you can modify their contents after creation. Here's an overview of how to work with lists in Python: --- ### **1. Creating a List** You can create a list by enclosing elements in square brackets `[]`, separated by commas. ```python # Example of a list my_list = [1, 2, 3, 4, 5] print(my_list)  # Output: [1, 2, 3, 4, 5] ``` Lists can contain elements of different data types, including numbers, strings, other lists, or even mixed types.

Data Structures in Python

It seems there might be a typo, and you meant **"Data Structures in Python"**. Below is a detailed explanation of Python's core data structures, including examples and use cases. --- ### **1. List** - **Description**: Ordered, mutable (changeable), allows duplicates. - **Use Case**: Storing collections of items (e.g., numbers, strings). - **Example**:   ```python   my_list = [1, 2, 3, "apple"]   my_list.append(4)       # Add to end: [1, 2, 3, 'apple', 4]   my_list.pop(0)          # Remove first element: [2, 3, 'apple', 4]   ``` ---

Functions in Python

Functions are a fundamental building block in Python, allowing you to organize and reuse code. They are like mini-programs within your main program, performing specific tasks. Here's a breakdown of functions in Python: 1. Defining a Function  * You define a function using the def keyword, followed by the function name, parentheses (), and a colon :.  * The code that the function executes is indented below the def line. def greet(name):     """This function greets the person passed in as a parameter."""     print("Hello, " + name + ". How are you?")

Basic Concepts in Python

**Basic Concepts in Python** 1. **Syntax and Structure**      - **Indentation**: Python uses indentation (whitespace) to define code blocks (e.g., loops, functions) instead of braces.      - **Comments**: Start with `#`. Multi-line comments use triple quotes (`'''` or `"""`).      - **Statements**: End of line terminates a statement; use `\` for line continuation or parentheses for multi-line statements. 2. **Variables and Data Types**      - **Variables**: No explicit declaration; dynamically typed (e.g., `x = 5`, then `x = "hello"`).      - **Basic Types**:        - `int` (integer), `float` (decimal), `str` (text), `bool` (`True`/`False`), `NoneType` (`None`).      - **Collections**:        - **List**: Mutable, ordered (`[1, 2, 3]`).        - **Tuple**: Immutable, ordered (`(1, 2, 3)`). ...