在Python语言中,已知x=【1,2】和y=【3,4】,那么x+y的结果是() A.3 B.7 C.[1,2,3,4] D.[4,6] 查看答案
"It’ s not I. Q. but the amount of time a child spends reading that is the key to automaticity," according to Rossman. You can test your child by giving him a paragraph or two to read aloud—something unfamiliar but appropriate to his age. If he reads aloud with expression, with ...
c:\intelpython3\lib\site-packages\matplotlib\__init__.py:importwarningswarnings.filterwarnings("ignore") 加载数据框。请注意,index_col=0我们没有将行名(索引)作为单独的列读入。 代码语言:javascript 复制 # Loadinthe dataframedf=pd.read_csv("data/winemag-data-130k-v2.csv",index_col=0) 代码语...
这行代码用来创建字典,定义为df,且必须是大括号{},'security'是字典项,:[]用来存放该项的值,一个字典可以存多个,中间用逗号分开,本策略的字典一共两个项,分别是'security'和'30zf',后面的[]用来存放。 3.stocks=account.iwencai_securities account.iwencai_securities是MINDGO平台的中i问财自然语言选股后的结...