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A comment on Lesser-known Pandas tricks (2019).

Re:Lesser-known Pandas tricks (2019) by andreareina on Wednesday March 11, 2020 @10:05AM (#22545927)
Merge with indicator is also useful for doing anti-joins:

    left.merge(right, how="left", indicator=True, ...)
    [lambda df: df._merge == "left_only"]
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