'merge' 2 Dataframes On Elements From List?

I want to do the following merge (hard to describe in words): This are my Dataframes df8=pd.DataFrame({'names':[['Hans','Meier'],['Debby','Harry','Peter']]}) names 0 ['Hans','

Solution 1:

Here is one way

df9['text']=df9['text'].str[0]

l=[df9.loc[x,'text'].tolist() forxin df8.names]
Out[505]: [['hi im hans', 'hi im meier'], ['hi im debby', 'hi im harry', 'hi im peter']]

df9['cont']=l

Solution 2:

Using s.get:

d=df9.set_index('caller')['text']
df8=df8.assign(content=df8.names.apply(lambda x:[d.get(i) for i in x]))
print(df8)

---

                   names                                        content
0          [Hans, Meier]                  [[hi im hans], [hi im meier]]1  [Debby, Harry, Peter]  [[hi im debby], [hi im harry], [hi im peter]]

Solution 3:

You can lookup the values in df9:

df8['contents'] = df8['names'].apply(lambda l: [df9['text'].loc[name] for name in l])

Solution 4:

df8['content']= df8['names'].apply(lambda x: [df9.loc[name,'text'][0] for name in x])

This return an error if there is a name that isn't found in df9. You can make it more robust with

df8['content']= df8['names'].apply(lambda x: [df9['text'].get(name)[0] if df9['text'].get(name) else None for name in x])

This will have a list that contains the text for every name found, and None for any name not found.

If all you're using df9 for is as a look-up table, then it would be more appropriate to store it as a dictionary, in which case it would be

df8['content']= df8['names'].apply(lambda x: [my_dict.get(name)[0] if my_dict.get(name) else None for name in x])