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merge and join dataframes with pandas in python

pd.merge(df,df_country,on='Country Code' , how='left')
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pandas join two dataframes

df = df1.append(df2)
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dataframe merge join on columns

df1.merge(df2, left_on='lkey', right_on='rkey', suffixes=(False, False))
Traceback (most recent call last):
...
ValueError: columns overlap but no suffix specified:
    Index(['value'], dtype='object')

>>>
>>>
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