I have two pandas DataFrames df1 and df2:
df1:      df2:
   A         A
1 10      2 21
2 20      3 31
5 50      4 41
6 60      5 51
and want to merge both DataFrames to the most complete one based on their indexes. The result should be the following:
df_full
   A
1 10
2 20
3 31
4 41
5 50
6 60
 
    