This guide explains f-String Formatting: Width, Precision, and Alignment through a focused example and practical reasoning. No prior knowledge of this specific operation is required.
Understanding the Concept
Format specifications inside f-strings control alignment, width, sign and precision. Use a fixed decimal precision for display, but remember that rounding the display does not make the underlying float exact.
When You Would Use This
Align item names and prices in a small console table.
Step-by-Step Example
product_name = "Notebook"
unit_price = 4.75
print(f"{'Item':<12}{'Price':>8}")
print(f"{product_name:<12}{unit_price:>8.2f}")How the Example Works
The name is left-aligned to width 12, while the numeric price is right-aligned to width 8 with two digits after the decimal point.
Example Output
Item Price
Notebook 4.75Try It Yourself
Add a second item with a longer name and inspect alignment.
Common Beginner Mistakes
- Confusing
<and>alignment markers. - Using precision on an integer without checking its supported format options.
- Assuming all Unicode symbols occupy one display column.
Key Takeaways
- Format specifications inside f-strings control alignment, width, sign and precision.
- The name is left-aligned to width 12, while the numeric price is right-aligned to width 8 with two digits after the decimal point.
- Avoid this mistake: Confusing
<and>alignment markers.