摘要：
from pandas import DataFrame left = DataFrame([[1,2],[3,4],[5,6]],index=['a','c','e'],columns=['item1','item2']) right = DataFrame([[7,8],[9,10],[11,1 阅读全文
摘要：
from pandas import DataFrame import pandas as pd df1 = DataFrame({'key':['b','b','a','c','a','a','b'], 'data1':range(7)}) df2 = DataFrame({'key':['a', 阅读全文
