What does the following code output?

Question

BlackTom AI · Accepted Answer

isinstance(3.14, int) returns False, so the function returns False and print outputs False.

1) Relevant knowledge points and concepts
- isinstance(object, classinfo) checks whether object is an instance of the given type and returns a boolean (True or False).
- 3.14 is a float (type float), not an int (type int).
- The function returns a boolean and print displays the boolean literal (capitalized True or False in Python).

2) Step-by-step reasoning
- The call is intChecker(3.14).
- Inside intChecker, num is 3.14.
- The expression isinstance(num, int) is evaluated. Since type(3.14) is float, isinstance(3.14, int) → False.
- The if condition is False, so the else branch executes: return False.
- The print(intChecker(3.14)) prints the returned boolean value: False.

3) Intermediate values shown
- num = 3.14
- type(num) = float
- isinstance(num, int) = False
- function return value = False
- printed output = False

4) Why the correct answer is correct
Because the core check is whether the argument is an int. A float literal 3.14 is not an int, so the boolean test fails and the function explicitly returns False. print then displays that boolean value.

5) Why the other options are incorrect
- TypeError: No type error is raised; isinstance and return work on floats fine.
- True: Would be correct only if the argument were an int (e.g., 3), but 3.14 is not an int.
- "3.14": The function does not return a string representation; it returns a boolean.
- 3.14: The function does not return the numeric input; it returns True/False.
- KeywordError: There is no such exception raised here.

6) Conclusion
The printed output is False, which matches the provided correct answer: False.

What does the following code output?单项选择题

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