The Drop() method appears to do nothing to my dataframe, but no error is given-CodePudding

I am using drop() to try to remove a row from a dataframe, based on an index. Nothing seems to happen. I get lots of errors if I play with the syntax, but the below example yields the same dataframe I started with.

data= {"col1":[1, 3, 3,3],"col2":[4,5,6,4],"col3":[7,6,6,8]}
testdf2 = pd.DataFrame(data)

testdf2.drop([1])
testdf2

I assume I'm missing something obvious?

CodePudding user response：

When using drop, you must reassign to your df (Or create a new one).

import pandas as pd
data= {"col1":[1, 3, 3,3],"col2":[4,5,6,4],"col3":[7,6,6,8]}
testdf2 = pd.DataFrame(data)

testdf2 = testdf2.drop([1])
testdf2

Alternatively, supply inplace.

testdf2.drop([1], inplace=True)

However, this could lead to complications regarding view / copy and I usually reassign.

Hope that helps!