,arr:数组,axis:要向后滚动的轴,其它轴的相对位置不会改变,start:默认为零,表示完整的滚动。...会滚动到特定位置。...新建
import pandas as pd
a = pd.DataFrame([[1,2,3],
[4,5,6],
[7,8,9...dataframe
横向
pd.concat([a,a],axis=1)
纵向
pd.concat([a,a],axis=0)
数据去重
import pandas as pd
df = pd.DataFrame...copy
import pandas as pd
a = pd.DataFrame([[1,2,3],
[4,5,6],
[7,8,9