i have 2 Data frames that have different length. first one has 1200 rows and the other only 1 the first one is sth like this.
Date Open High Low Close Adj Close Volume
2012-01-09 70.40 50.20 9.40 71.5 1.8 1.8 9447.0
the second one looks like this
Name Marcet Cap. Symbol Symbol2 Boerse Info. Periode ISIN WKN
Once 1 tpp.us NaN 1 5Y US010001 999000
i only want to add (append) 2 columns to the first one, which are ISIN and WKN.
Date Open High Low Close Adj Close Volume ISIN WKN
2012-01-09 70.40 50.20 9.40 71.5 1.8 1.8 944 US0101 999000
i already tried Merge() and Concat, however i got an KeyError and also i tried this which doesn't work.
first['ISIN']=second['ISIN'].values
how can i add 2 columns to the other DF?
Assign value by values[0]
instead of values
import pandas as pd
import io
data_string = """ Date Open High Low Close Adj_Close Volume
2012-01-09 70.40 50.20 9.40 71.5 1.8 9447.0
2012-01-10 70.40 50.20 9.40 71.5 1.8 9447.0"""
first = pd.read_csv(io.StringIO(data_string), sep='\s+')
data_string = """Name Marcet_Cap. Symbol Symbol2 Boerse_Info. Periode ISIN WKN
Once 1 tpp.us NaN 1 5Y US010001 999000 """
second = pd.read_csv(io.StringIO(data_string), sep='\s+')
first['ISIN'] = second['ISIN'].values[0] # work
first['WKN'] = second['WKN'].values[0] # work
print(first) # print sample result
Date Open High Low Close Adj_Close Volume ISIN WKN
0 2012-01-09 70.4 50.2 9.4 71.5 1.8 9447.0 US010001 999000
1 2012-01-10 70.4 50.2 9.4 71.5 1.8 9447.0 US010001 999000