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'])
答案:BC
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'])
答案:BC
A. pass
B. continue
C. break
D. try
A. 对
B. 错
A. names. append('Helen', 'Mary')
B. names.remove(1)
C. names.index('Jack')
D. names[2]='Jack'
A. 1,2,3,5,
B. 1,2,3,4,
C. 1,2,3,
D. 1,2,3,5,6
A. s
D. ata
E. ad()csv('1.csv')(1)
F. rame,按照要求编写代码:import pandas as pddf = pd.read()csv('1.csv')(1) 输出df的末10行;(2) 输出df的前5行;(3) 输出df的前4行前5列的内容;我的
A. " What's happened to you?"
B. ' What's happened to you?'
C. ' What\\'s happened to you?'
D. "" Oh! " It sounds terrible."
A. 机器语言
B. 汇编语言
C. 高级语言
D. 科学计算语言
A. 递归
B. 嵌套
C. 回溯
D. 闭包