A、abs(s)
B、len(s)
C、count(s)
D、max(s)
答案：B
A、abs(s)
B、len(s)
C、count(s)
D、max(s)
答案：B
A. extend()函数
B. append()函数
C. insert()函数
D. drop()函数
对以上数据,以性别字段作为分组依据,并对分组后的数据重新排序的语法正确的是()
A. frame[['ID']].groupby(frame('gender')).count().sortⱣⱤvalues(by=('gender'))
B. frame[['ID']].groupby(['gender']).count().sortⱣⱤvalues(by=frame['gender'])
C. frame[['ID']].groupby(('gender')).count().sortⱣⱤvalues(by=frame('gender'))
D. frame[['ID']].groupby(frame['gender']).count().sortⱣⱤvalues(by=['gender'])
解析：答案解析:
A. function
B. func
C. def
D. procedure
A. s.remove(x)
B. s.discard(x)
C. s.pop(x)
D. s.clear()
A. " What's happened to you?"
B. ' What's happened to you?'
C. ' What\\'s happened to you?'
D. "" Oh! " It sounds terrible."
A. 字典
B. 列表
C. 字典中的键
D. 集合(set类型)
A. print(s[3:5]) # 输出 lo
B. print(s[5:3]) # 输出空字符串
C. print(s[::-1]) # 输出!dlrow olleH
D. print(s[-1::-1]) # 输出!dlrow olleH
A. pass
B. continue
C. break
D. try
