add two df pandas code example

Example 1: combining 2 dataframes pandas

df_3 = pd.concat([df_1, df_2])

Example 2: how to merge two dataframes

df_merge_col = pd.merge(df_row, df3, on='id')

df_merge_col

Example 3: dataframe concatenate

# Pandas for Python

df['col1 & col2'] = df['col1']+df['col2']

#Output
#col1	col2	col1 & col2
#A1		A2		A1A2
#B1		B2		B1B2