How to replace&add the dataframe element by another dataframe in Python Pandas?
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Published on 2012-08-31T15:00:12Z
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2012/08/31
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Suppose I have two data frame 'df_a' & 'df_b' , both have the same index structure and columns, but some of the inside data elements are different:
>>> df_a
sales cogs
STK_ID QT
000876 1 100 100
2 100 100
3 100 100
4 100 100
5 100 100
6 100 100
7 100 100
>>> df_b
sales cogs
STK_ID QT
000876 5 50 50
6 50 50
7 50 50
8 50 50
9 50 50
10 50 50
And now I want to replace the element of df_a by element of df_b which have the same (index, column) coordinate, and attach df_b's elements whose (index, column) coordinate beyond the scope of df_a . Just like add a patch 'df_b' to 'df_a' :
>>> df_c = patch(df_a,df_b)
sales cogs
STK_ID QT
000876 1 100 100
2 100 100
3 100 100
4 100 100
5 50 50
6 50 50
7 50 50
8 50 50
9 50 50
10 50 50
How to write the 'patch(df_a,df_b)' function ?
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