.merge in python code example
Example 1: 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 2: python merge using or statement
dupes = (df.B_on_A_match_1 == df.B_on_A_match_2)
df.loc[~dupes]
A A_on_B_match_1 A_on_B_match_2 B B_on_A_match_1 B_on_A_match_2
0 1.0 NaN NaN NaN 9.0 4.0
0 NaN 2.0 6.0 8.0 NaN NaN
1 NaN 4.0 4.0 5.0 NaN NaN