2. (多选题)输入一个表示半径的浮点数,计算圆的面积的程序正确的有:(圆周率取3.14,结果保留2位小数)

A. [x * 2 for x in range(10)]

B. [x * x for x in range(10)]

C. (x * x for x in range(10))

D. {x * x for x in range(10)}

A. zeros()

B. emptys()

C. arange()

D. ones()

A. d = {'北京': 2030, '上海': 2200, '天津': 1985, '重庆': 3325}print(d.('上海'))

B. d = {'北京': 2030, '上海': 2200, '天津': 1985, '重庆': 3325}print(d['上海'])

C. d = {'北京': 2030, '上海': 2200, '天津': 1985, '重庆': 3325}print(d.get('上海'))

D. d = {'北京': 2030, '上海': 2200, '天津': 1985, '重庆': 3325}print(d.get['上海'])

A. x = int(input())print(x ^ 2)

B. x = int(input())print(x * 2)

C. x = int(input())print(x ** 2)

D. x = int(input())print(x * x)

A. 　 对

B. 　 错

A. 　 1

B. 　 2

C. 　 3

D. 　 4

A. else

B. elif

C. pass

D. else if

A. ls = [25, 13, 36, 1]ls.sort()print(ls)

B. ls = [25, 13, 36, 1]ls.sorted()print(ls)

C. ls = [25, 13, 36, 1]print(ls.sort())

D. ls = [25, 13, 36, 1]print(sorted(ls))

A. 　 对

B. 　 错