how to remove a pandas dataframe from another dataframe, just like the set subtraction:
a=[1,2,3,4,5]
b=[1,5]
a-b=[2,3,4]
and now we have two pandas dataframe, how to remove df2 from df1
In [5]: df1=pd.DataFrame([[1,2],[3,4],[5,6]],columns=['a','b'])
In [6]: df1
Out[6]:
a b
0 1 2
1 3 4
2 5 6
In [9]: df2=pd.DataFrame([[1,2],[5,6]],columns=['a','b'])
In [10]: df2
Out[10]:
a b
0 1 2
1 5 6
then we expect df1-df2 result will be
In [14]: df
Out[14]:
a b
0 3 4
how to do it? thank you.