Labeled point with precision 1
Input
format_point(1.234, 4.567, label='A', precision=1)
Output
A: (1.2, 4.6)
label is provided and precision=1 rounds coordinates to one decimal place.
Full lesson preview
Create a function with keyword-only parameters
Practice defining keyword-only parameters using '*' and using them for clearer function calls.
Python practice15 minFunctions & ScopeIntermediateLast updated March 17, 2026
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
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 1
Input
format_point(1.234, 4.567)
Output
(1.23, 4.57)
Default precision is 2 and no label is provided.