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Beginner 14 min readModule: Module 2: Variables, Data Types & String Formatting

Python Data Types, Type Casting & f-Strings

Master numeric types, boolean logic, string methods, and formatted f-strings (f'{var:.2f}').

What You Will Learn in This Lesson

  • Dynamic typing in Python (int, float, str, bool)
  • Explicit type casting (int('42'), float('3.14'))
  • Modern f-string interpolation and decimal formatting

Introduction & Core Concept

Python is dynamically and strongly typed: variable types are determined at runtime, but invalid operations (like adding a string to an integer) raise explicit TypeErrors.
WHY DOES THIS MATTER IN THE REAL WORLD?

f-strings (introduced in Python 3.6) provide the fastest and most readable string interpolation syntax in Python.

f-String Formatting

python
python
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course = "KWAS Academy Python"
price = 0.00
rating = 4.982
 
print(f"Course: {course} | Price: ${price:.2f} | Rating: {rating:.1f}/5.0")

Line-by-Line Technical Breakdown

1Strings in Python are immutable; string methods return new modified copies.

Try It Yourself (Interactive Editor)

Modify the code in real-time and click Run to test live browser output and console logs.

Intelligent Code Runner & Live Sandbox[PYTHON]
PYTHON SOURCE EDITOR
Interactive Live Code

Industry Best Practices & Professional Standards

  • Always use f-strings instead of old % formatting or str.format().

Lesson Summary & Core Takeaways

  • f-strings and dynamic types provide expressive, concise data representation.