In which of the following scenarios can f-strings be used?

Question

BlackTom AI · Accepted Answer

f-strings produce string values by evaluating expressions inside { } at runtime, so any Python API that accepts a string can receive an f-string.

1) Relevant knowledge points and concepts
- f-strings (formatted string literals, introduced in Python 3.6) are string literals prefixed with f or F; expressions inside braces are evaluated and formatted into the resulting string.
- Any function or method that expects a string argument can be passed an f-string because an f-string is just a string value after evaluation.
- Matplotlib functions like plt.title(), plt.xlabel(), plt.ylabel(), and plt.legend() accept string arguments for display text.

2) Step-by-step reasoning
- Write an f-string: f"Value is {x}". At runtime Python evaluates the expression x, converts it using __format__ (default str conversion if no format specified), and produces a final str object, e.g., "Value is 5".
- Call a plotting function expecting a string, for example plt.title(f"Mean = {mean:.2f}"). The plotting function receives the evaluated string and displays it as the title.
- Therefore, f-strings work wherever strings are accepted, including plotting labels and legends.

3) Intermediate steps (example)
- Given mean = 3.14159
- f"Mean = {mean:.2f}" -> evaluate {mean:.2f} -> "3.14" -> final string "Mean = 3.14"
- plt.title("Mean = 3.14") is equivalent to plt.title(f"Mean = {mean:.2f}")

4) Why the correct answer is correct
- Option c names functions that accept strings; since f-strings evaluate to strings, they can be used directly with plt.title(), plt.xlabel(), plt.ylabel(), plt.legend().

5) Why other options are incorrect
- a: Incorrect — f-strings are not limited to print(); any place a string is accepted works.
- b: Incorrect — not limited to terminal output; GUI libraries, files, and APIs accept f-strings.
- d: Incorrect — f-strings can include non-string variables (numbers, objects); those are converted/formatted inside the f-string.

6) Conclusion
This reasoning confirms option c is correct.

In which of the following scenarios can f-strings be used?单项选择题

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