Merging pandas dataframe with an empty dataframe

Question

I have two pandas dataframes:

df1

   2014  2015  2016  2017
NY   90    85    84    80
IL   88    79    72    65
VA   75    76    81    79
MD   60    62    66    70

df2

   Empty DataFrame
   Columns: []
   Index: [CA, WA, NY, VA, DE, MD, IL]

How can I get the following dataframe using the two above?

   2014  2015  2016  2017
CA   -1    -1    -1    -1
WA   -1    -1    -1    -1
NY   90    85    84    80
VA   75    76    81    79
DE   -1    -1    -1    -1
MD   60    62    66    70
IL   88    79    72    65

jezrael · Accepted Answer · 2018-07-08 06:12:30Z

5

Use reindex by index of df2:

df = df1.reindex(df2.index, fill_value=-1)
print (df)
    2014  2015  2016  2017
CA    -1    -1    -1    -1
WA    -1    -1    -1    -1
NY    90    85    84    80
VA    75    76    81    79
DE    -1    -1    -1    -1
MD    60    62    66    70
IL    88    79    72    65

edited Jul 8, 2018 at 6:12

answered Jul 8, 2018 at 6:06

jezrael

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