Python Pandas update a dataframe value from another dataframe

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Using DataFrame.update, which aligns on indices (https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.update.html):

>>> df1.set_index('Code', inplace=True)
>>> df1.update(df2.set_index('Code'))
>>> df1.reset_index()  # to recover the initial structure

   Code      Name   Value
0     1  Company1   200.0
1     2  Company2  1000.0
2     3  Company3   400.0

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