cat_type = CategoricalDtype(categories=['3', '2', '1'], ordered=True)
cat_type2 = CategoricalDtype(categories=['Kind','Jong','Middelbaar','Oud'], ordered=True)
​
df1['pclass'] = df1['pclass'].map({1: '1', 2: '2', 3: '3'})
df1['survived'] = df1['survived'].map({1: True, 0: False})
df1['sex'] = df1['sex'].map({'male': 'M', 'female': 'V'})
df1['pclass'] = df1['pclass'].astype(cat_type)
df1['sex'] = df1['sex'].astype('category')
df1['age'] = df1['age'].map(lambda x: round(x))
df1['age'] = df1['age'].astype('int8')
df1['fare'] = df1['fare'].map(lambda x: round(x, 2))
df1['age_cat'] = pd.cut(df1['age'], bins=4, labels=('Kind','Jong','Middelbaar','Oud'))
df1['age_cat'] = df1['age_cat'].astype(cat_type2)
df1 = df1.filter(items=['pclass', 'name', 'survived', 'sex', 'age', 'age_cat', 'fare'])
df1