Pandas loc multiple conditions [duplicate]

Answer 1

use eq instead of ==:

df.loc[~(df['A'].eq('blue') & df['B'].eq('green'))]

Answer 2

query

Note the != and or as consequence of De Morgan's Law

df.query('A != "blue" or B != "green"')

Answer 3

You should separate the two propositions:

df1=df.loc[~(df['A']=='blue') & ~(df['B']=='green')]