△ n.transpose()对换数组的维度,矩阵的转置
△ ndarray.T 与上类似,用于矩阵的转置
△ n.concatenate((a1, a2, ...), axis)沿指定轴连接同形数组...新建
import pandas as pd
a = pd.DataFrame([[1,2,3],
[4,5,6],
[7,8,9...(必须使用iloc)
a.iloc[:,0:3]
df.iloc[:,[-1]]
a[["feature_1", "feature_2"]]
获取dataframe列名
df.columns返回一个可迭代对象...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...,inplace = True, regex = True)
a.replace('%','',inplace = True, regex = True)
Dataframe copy
import pandas