pandas srt.lower() not working on dataframe column

Question

I\'m working with the Titanic dataset available from Kaggle. I have it in a dataframe and i want to change the case of the \"sex\" column to lowercase. I\'m using the follow

Answer 1

str.lower() does not modify the existing column. It just returns a new Series with the lowercase transform applied. If you want to overwrite the original column, you need to assign the result back to it:

df['sex'] = df.sex.str.lower()