how to check in a dataframe that a particluar value is coming in whixh xolumn code example
Example 1: how to keep only certain columns in dataframe
df.drop(df.columns[[1, 2]], axis=1, inplace=True)
df1 = df1.drop(['B', 'C'], axis=1)
df1 = df[['a','d']]
Example 2: pandas check if any of the values in one column exist in another
df["exists"] = df.drop("target", 1).isin(df["target"]).any(1)
print(df)
target A B C exists
0 cat bridge cat brush True
1 brush dog cat shoe False
2 bridge cat shoe bridge True