Update README.md

Author: Cesar-Gabriel

README.md

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-# Lesson-103-python-formating-strings
+# Lesson 103: Python String Formatting
+
+Welcome to Lesson 103 of the Python Learning Lounge! In this lesson, we will cover various methods for formatting strings in Python.
+
+## Table of Contents
+
+- [Introduction](#introduction)
+- [String Formatting Methods](#string-formatting-methods)
+  - [Old Style `%` Formatting](#old-style--formatting)
+  - [New Style `.format()` Method](#new-style-format-method)
+  - [f-Strings (Literal String Interpolation)](#f-strings-literal-string-interpolation)
+- [Examples](#examples)
+- [Exercises](#exercises)
+- [Conclusion](#conclusion)
+
+## Introduction
+
+String formatting is a crucial part of writing clean and readable code in Python. It allows you to create strings that include variable values, making your code more dynamic and versatile.
+
+## String Formatting Methods
+
+### Old Style `%` Formatting
+
+The old style of string formatting uses the `%` operator. This method is less commonly used in modern Python code but is still worth knowing.
+
+```python
+name = "Alice"
+age = 30
+formatted_string = "Hello, %s! You are %d years old." % (name, age)
+print(formatted_string)
+```
+
+### New Style `.format()` Method
+
+The `.format()` method is more powerful and flexible than the old style. It uses curly braces `{}` as placeholders in the string.
+
+```python
+name = "Alice"
+age = 30
+formatted_string = "Hello, {}! You are {} years old.".format(name, age)
+print(formatted_string)
+```
+
+### f-Strings (Literal String Interpolation)
+
+Introduced in Python 3.6, f-strings are the most modern and preferred way of formatting strings. They provide a concise and readable syntax.
+
+```python
+name = "Alice"
+age = 30
+formatted_string = f"Hello, {name}! You are {age} years old."
+print(formatted_string)
+```
+
+## Examples
+
+Here are a few more examples of string formatting:
+
+1. Using the old style `%` formatting:
+
+    ```python
+    value = 42
+    formatted_string = "The answer is %d." % value
+    print(formatted_string)
+    ```
+
+2. Using the `.format()` method:
+
+    ```python
+    temperature = 20.5
+    formatted_string = "The temperature is {:.1f} degrees Celsius.".format(temperature)
+    print(formatted_string)
+    ```
+
+3. Using f-strings:
+
+    ```python
+    pi = 3.14159
+    formatted_string = f"The value of pi is approximately {pi:.2f}."
+    print(formatted_string)
+    ```
+
+## Exercises
+
+1. Write a string that includes your name and your favorite hobby using the old style `%` formatting.
+2. Create a string that includes your age and the current year using the `.format()` method.
+3. Use an f-string to create a string that includes your hometown and your favorite food.
+
+## Conclusion
+
+String formatting is a fundamental skill for any Python programmer. By mastering these three methods, you'll be well-equipped to handle any string formatting task that comes your way.
+
+Happy coding!
+
+---
+
+For more lessons and tutorials, visit the [Python Learning Lounge](https://github.com/Python-leatning-lounge).