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01. Define a function that adds two numbersE02. Write a function that returns a greetingE03. Implement a function to find the maximum of threeE04. Create a function to join words with a separatorE05. Write a function that returns the length of a sequenceE06. Implement a function with a default argumentE07. Create a function that accepts any number of argsE08. Write a function that handles keyword argumentsE09. Implement a function that returns multiple valuesE10. Write a function that modifies a passed listE11. Define a function that reads a global variableE12. Write a function with a simple docstringE13. Write a function that demonstrates nonlocal usageM14. Create a function factory returning customized functionsM15. Implement argument unpacking with *args and **kwargsM16. Write a function that avoids mutable default argsM17. Create a function with keyword-only parametersM18. Implement a simple recursive function with a base caseM19. Implement a decorator that logs function callsH20. Write a decorator that memoizes function resultsH

Problem No 17

Create a function with keyword-only parameters

Medium

≈ 15 minute session

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Summary

Practice defining keyword-only parameters using '*' and using them for clearer function calls.

Problem statement

Define format_point(x, y, *, label=None, precision=2) which returns a formatted string for the point (x, y). label and precision must be keyword-only parameters. precision controls the number of decimal places (use Python rounding rules with format specification). If label is provided, prepend it followed by ': '. For example, format_point(1.234, 4.567, label='P', precision=1) -> "P: (1.2, 4.6)".

Task

Write a function that enforces keyword-only arguments and uses them to control output formatting.

Examples

Labeled point with precision 1

Input

format_point(1.234, 4.567, label='A', precision=1)

Output

A: (1.2, 4.6)

Explanation

label is provided and precision=1 rounds coordinates to one decimal place.

Input format

A function call format_point(x, y, *, label=None, precision=2). label and precision must be passed as keywords if used.

Output format

Return a string representing the point, optionally prefixed with the label.

Constraints

Enforce label and precision as keyword-only by using '*' in the function signature. precision is a non-negative integer.

Samples

Sample input 0

format_point(1.234, 4.567)

Sample output 0

(1.23, 4.57)

Explanation 0

Default precision is 2 and no label is provided.

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