Question at position 3 What will the following code print? name = "Alice" age = 30 print(f"{name} is {age} years old.")Alice is thirty years old.name is age years old.Alice is 30 years old.Alice is 30Clear my selection单项选择题
A
Alice is thirty years old.
B
name is age years old.
C
Alice is 30 years old.
D
Alice is 30

Question

Question at position 3 What will the following code print? name = "Alice" age = 30 print(f"{name} is {age} years old.")Alice is thirty years old.name is age years old.Alice is 30 years old.Alice is 30Clear my selection单项选择题

A

Alice is thirty years old.

B

name is age years old.

C

Alice is 30 years old.

D

Alice is 30

BlackTom AI · Accepted Answer

f-strings in Python (formatted string literals) evaluate expressions inside braces and insert their values into the string. Here the variables name and age are evaluated and converted to their string representations inside the literal.

1. Relevant knowledge points and concepts
- Formatted string literals (f-strings) in Python are written with an f prefix: f"...".
- Any expression inside { } in an f-string is evaluated, and its result is converted to a string (using str()) and inserted into the surrounding text.
- Variable values are used directly; Python will not automatically spell out numbers as words.

2. Step-by-step reasoning
- The code sets name = "Alice" and age = 30.
- The print statement uses an f-string: print(f"{name} is {age} years old.").
- Python evaluates the expression inside the first braces: {name} -> "Alice".
- Python evaluates the expression inside the second braces: {age} -> 30, then converts it to "30" when placing into the string.

3. Intermediate steps shown
- f"{name} is {age} years old." becomes "Alice is " + str(30) + " years old."
- That concatenation yields "Alice is 30 years old."
- print outputs that exact string followed by a newline.

4. Why the correct answer is correct
- Because f-strings substitute variable values directly, the result is the name "Alice" and the numeric age represented as "30", producing the full sentence "Alice is 30 years old." The code does not convert the integer 30 to the word "thirty", so the numeric form is used.

5. Why the other options are incorrect
- "Alice is thirty years old." is wrong because Python does not spell out numbers; age is the integer 30, not the word "thirty".
- "name is age years old." is incorrect because the braces cause evaluation; variables are replaced by their values, not printed as literal identifiers.
- "Alice is 30" is incomplete: the f-string includes " years old." at the end, so the full sentence must include that phrase.

6. Conclusion
The printed output is "Alice is 30 years old." which matches the provided correct answer.

Question at position 3 What will the following code print? name = "Alice" age = 30 print(f"{name} is {age} years old.")Alice is thirty years old.name is age years old.Alice is 30 years old.Alice is 30Clear my selection单项选择题

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