Python Operators Quiz

Question A (novice vs. competent): Consider the following code snippet:

list = [1, 2]<br /> list2 = list<br /> string = "abc"<br /> string2 = string<br /> list += [3, 4]<br /> string += "def"

What are the final values respectively of list2 and string2?

1. [1, 2] and "abc"
2. [1, 2, 3, 4] and "abc"
3. [1, 2] and "abcdef"
4. [1, 2, 3, 4] and "abcdef"
5. I don’t know.

Question B (competent vs. expert): Consider the following Python interpreter session:

>>> x<br /> '0xFF'<br /> >>> y<br /> 10<br /> >>> isinstance(x, str)<br /> True<br /> >>> isinstance(y, int)<br /> True

What would be the result of the expression x + y?

1. '0xFF10'
2. 265
3. A TypeError exception will be raised, since you cannot add an integer to a string in Python.
4. The answer cannot be predicted given this code.
5. '0x109'