pandas check if any of the values in one column exist in another

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Troy
05 Nov 2018
1df["exists"] = df.drop("target", 1).isin(df["target"]).any(1)
2print(df)
3
4    target  A       B       C       exists
50   cat     bridge  cat     brush   True
61   brush   dog     cat     shoe    False
72   bridge  cat     shoe    bridge  True
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