merge two dataframes by a column code example
Example 1: combining 2 dataframes pandas
df_3 = pd.concat([df_1, df_2])
Example 2: python dataframe left join
>>> left.merge(right, on='user_id', how='left')
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
Example 4: combine df columns python
df["period"] = df["Year"] + df["quarter"]