titanic-prep-8.py

def get_age(df):
    for pclass in [1,2,3]:
        for sex in ['male','female']:
            for title in ['Miss','Mr','Master','Mrs','Unknown']:
                ds = df[df['Pclass'] == pclass]
                ds = ds[ds['Sex'] == sex]
                ds = ds[ds['Title'] == title]
                median = ds['Age'].median()
                df.loc[(df['Age'].isnull()) & (df['Pclass'] == pclass) & (df['Sex'] == sex), 'Age'] = median

get_age(titanic_full)