在 Pandas中，drop_duplicates（）提供了删除重复值的功能，这个方法主要帮助我们删除后出现的重复值。例如，某列数据如下：Open： Open1 12 A: df[‘open’].drop_first（） B: df[‘open].drop_duplicates（keep=’first’） C: df[‘open’].drop_duplicates（keep=’last’） D: df[‘open’].drop_last（）

使用open方法打开具有浏览器工具条，地址栏，菜单栏的窗口，下列选项正确的是（） A: open（"x、html"，"HI"，"toolbas=1，scrollbars=1，status=1"）； B: open（"HI"，"scrollbars=1，location=1，status=1"）； C: open（"x.html"，"status=yes，menubar=1，location=1"）； D: open（"x.html"，"HI"，"toolbas=yes，menubar=1，location=1"）；

用（ ）语句打开顺序文件File1.txt后，可以进行写操作 A: Open "File1.txt" For Input As B: 1 C: Open "File1.txt" For Output As D: 1 E: Open "File1.txt" For Random As F: 1 G: Open "File1.txt" For Binary As H: 1

要向Data.dat 文件中添加数据，下面语句中正确的是______ 。 A: Open "Datdat" For OutputAs #1 B: Open "Datdaf' For InputAs #1 C: Open Datdat For OutputAs #I D: Open Datdar For Append As #1

下列哪一种是以顺序文件方式打开文件并进行写操作( ). A: Open "c:\file1.dat" For Output as B: 1 C: Open "c:\file1.dat" For Input as D: 1 E: Open "c:\file1.dat" For Print as F: 1 G: Open "c:\file1.dat" For Write as H: 1

When starting a hot engine, the mixture control should be placed in A: 1/3 open B: 1/2 open C: idle cutoff

若要把数据追加到顺序文件D:\Stu.txt末尾，可以使用下列语句实现的是（ ）。 A: Open "D:\Stu.txt" For Output As B: 1 C: Open "D:\Stu.txt" For Append As D: 1 E: Open D:\Stu.txt For Output As F: 1 G: Open D:\Stu.txt For Append As H: 1

如果从数据文件 c:\data.txt 中读取数据时,以下打开文件方式中,正确的是( ). A: Open c:\data.txt For Input As B: 1 C: Open c:\data.txt For Output As D: 1 E: Open "c:\data.txt" For Input As F: 1 G: Open "c:\data.txt" For Output As H: 1

为了读取数据，需打开顺序文件“D:\data5.txt”，以下正确的命令是 A: Open D:\data5.txt For Input As #1 B: Open "D:\data5.txt"For Input As #2 C: Open D:\data5.txt For Output As #1 D: Open "D:\data5.txt"For Output As #2

A:What time 1 you and Pete open the shop Saturdays? B:We 2 (open) the shop 3 10：00a.m. We are open 4 10：00a.m. 5 2:00 p.m.