This guide explains format() Function: Usage and Examples through a focused example and practical reasoning. No prior knowledge of this specific operation is required.
Understanding the Concept
format(value, specification) converts a value into formatted text according to its type’s formatting rules. It is useful for decimal places, widths, signs and numeric bases; it returns a string.
When You Would Use This
A measurement report needs numbers aligned to two decimal places.
Step-by-Step Example
temperature = 21.567
print(format(temperature, ".2f"))
print(format(23, "04d"))
print(format(255, "08b"))How the Example Works
The results are 21.57, 0023, and 11111111. Specifications control how values are displayed, not how the stored values are computed.
Example Output
21.57
0023
11111111Try It Yourself
Show a percentage value aligned in a field of width ten.
Common Beginner Mistakes
- Assuming
format()changes the source number. - Using an integer-only specifier such as
don a float. - Confusing numeric precision for display with accuracy of the calculation.
Key Takeaways
format(value, specification)converts a value into formatted text according to its type’s formatting rules.- The results are
21.57,0023, and11111111. - Avoid this mistake: Assuming
format()changes the source number.