如何组合 2 个具有不同形状和不同列名的 DataFrame 列

Question

Can someone help me out to combine/Union 2 dataframe who has different shapes with different columns names.

As you can see 1 dataframe is with 3 columns and the 2nd dataframe contains only 1 column.

I want to put dataframe 02 clientid column below to dataframe 01 Turtlemint profile_id column and create new column with vertical name and mentioned value as Life against all the value we put under the 1st dataframe columns like I mentioned inside the image.

How can I achieve this?

Answer 1

Using append while changing the column name of your second dataframe, you can achieve this.

A simple, but similar example:

df1 = pd.DataFrame(data=np.array([[1,2,3], ['A', 'B', 'C']]).T, columns=['nr', 'lt'])
df2 = pd.DataFrame(data=['D', 'E', 'F'], columns=['lt2'])
df3 = df1.append(df2.rename(columns={'lt2':'lt'}))
df3.loc[df3['nr'].isnull(), 'Vertical'] = 'Life'

Dataframes:

df1:
  nr lt
0  1  A
1  2  B
2  3  C

df2:
    nr lt
0    1  A
1    2  B
2    3  C
0  NaN  D
1  NaN  E
2  NaN  F

Output:

    nr lt Vertical
0    1  A      NaN
1    2  B      NaN
2    3  C      NaN
0  NaN  D     Life
1  NaN  E     Life
2  NaN  F     Life

Answer 2

Here I have change the second DF column name same as first DF and then outer joined them, so we can the first DF extra columns.

Code:

df1 = pd.concat([df1, df2.rename(columns={'clientid': "Turtlemint profile_id"})], join='outer', axis=0).reset_index(drop=True)

above we haven't changed the second DF column name permeant so still I have use the column name clientid . Here the simple logic is if the ID exist in both table give value Life or else None .

ADD column:

df1['Vertical'] = np.where(df1['Turtlemint profile_id'].isin(df2['clientid']), 'LIFE', None)