Python Level 1: Variables, F-Strings & Input

Why This Matters: Python F-strings provide fast, readable string interpolation.

## Variables & F-String Interpolation

Python features built-in types: `int`, `float`, `str`, and `bool`.

```python
age = 21
gpa = 3.88
name = "Alex"

print(f"{name} is {age} years old with a {gpa} GPA.")
```

MENTAL MODEL & MEMORY LAYOUT

F-String Evaluation:
f"{name} is {age}" ──► Evaluates expressions inside {} ──► "Alex is 21"

COMMON PITFALLS TO AVOID

Trying to concatenate str and int with `+` without calling `str(val)` or using f-strings.

F-String Interpolation Pattern

x = 10
y = 20
print(f"Product of {x} and {y} is {x * y}")

Evaluates mathematical expressions inside f-string curly braces at runtime.

CONCEPT MASTERY CHECKPOINT

Which string formatting syntax is recommended in modern Python 3?

NEXT RECOMMENDED LESSON

Python Level 2: Control Flow & Loops

Continue Path

Challenge: Write a function `calculate_area(width, height)` that returns the area of a rectangle.

Python Level 1: Variables, F-Strings & Input

No test case execution results available yet. Click "Run Code" to evaluate your solution.