merge on column pandas code example
Example 1: merge on index pandas
pd.merge(df1, df2, left_index=True, right_index=True)
Example 2: pd merge on multiple columns
new_df = pd.merge(A_df, B_df, how='left', left_on=['A_c1','c2'], right_on = ['B_c1','c2'])
Example 3: pandas merge python
import pandas as pd
df1 = pd.DataFrame({'lkey': ['foo', 'bar', 'baz', 'foo'],
'value': [1, 2, 3, 5]})
df2 = pd.DataFrame({'rkey': ['foo', 'bar', 'baz', 'foo'],
'value': [5, 6, 7, 8]})
df1.merge(df2, left_on='lkey', right_on='rkey')
Example 4: merge two columns pandas
df["period"] = df["Year"] + df["quarter"]
Example 5: how to merge two column pandas
DataFrame["new_column"] = DataFrame["column1"] + DataFrame["column2"]