1
我有两个dataframes DF & DF2,我想用*合并它们作为通配符如何基于通配符加入熊猫数据框?
import pandas as pd
data = [[".",".",1],["AB.","B.",3],["B.",".",2]]
data2 = [["A","B","1"],["ABC","BC",4],["B","A",2]]
columns = ["Type1","Type2","Value"]
df = pd.DataFrame(data,columns=columns)
df2 = pd.DataFrame(data2,columns=columns)
print(df)
print(df2)
Type1 Type2 Value
0 * * 1
1 AB* B* 3
2 B* * 2
Type1 Type2 Value
0 A B 1
1 ABC BC 4
2 B A 2
通常这里DF2的第二行应与线1和线2 而在DF2线0应只匹配df1的第一行。 不知怎的,我想获得像
df2.merge(df,how='left',on=["Type1","Type2"])
但这里的结果不匹配任何东西。
这是我希望得到的结果。
data3 = [["A","B","1","1"],["ABC","BC",4,1],["ABC","BC",4,3],["B","A",2,1],["B","A",2,2]]
columns3 = ["Type1","Type2","Value_x","Value_y"]
results = pd.DataFrame(data3,columns=columns3)
print(results)
Type1 Type2 Value_x Value_y
0 A B 1 1
1 ABC BC 4 1
2 ABC BC 4 3
3 B A 2 1
4 B A 2 2
请注意,df2表实际上有超过100万行,所以我无法承担效率原因的循环。
您的预期结果是什么? – Alexander
好吧,我只是做到了:) – Nicolas