Python

Part one: single-answer multiple-choice items3 points for each question, 18 points in total

1The sign for multiple line comments of Python language is A. // B. # C. D. \\

2def print(a, b): if a < b: return a, b else: return b, a x, y = 4, 2; if x < y: print(x, y) else: print(y, x) The result of the program is A. 4, 2 B. 2, 4 C. None D. syntax error

3 class A: def __init__(self, a, b): self.a = b def ab(self, a): self.b = a a = A(1, 2) After we running the program, the value for a.a and a.b is A. 1, 2 B. 2, 1 C. 1, AttributeError: 'A' object has no attribute 'b' D. 2, AttributeError: 'A' object has no attribute 'b'

4def f(a, b): a = 10 for i in range(len(b)): if i % 2 != 0: b[i] = a a = 5; b = [1, 2, 3, 4, 5]; f(a, b) After we running the program, the value for a and b is A. 5, [1, 2, 3, 4, 5] B. 10, [1, 2 3, 4, 5] C. 10, [1, 10, 3, 10, 5] D. 5, [1, 10, 3, 10, 5]

5For binary input and output, write the integer 12 to the file. Which one is right ? A. pickle.dump(str(12), file) B. pickle.dump(12, file) C. pickle.load(str(12), file) D. pickle.load(12, file)

6The result of the following program is try: lst = [[1, 2, 3, 4], 2] print(lst[2]) except IndexError: print(index out of bound) else: print(nothing is wrong) finally: print(now is ok) A. index out of bound now is ok B. index out of bound C. nothing is wrong D. nothing is wrong now is ok