utils.py

from sklearn.base import BaseEstimator, TransformerMixin
from sklearn.impute import SimpleImputer 
import re

class PrepProcesor(BaseEstimator, TransformerMixin): 
    def fit(self, X, y=None): 
        self.ageImputer = SimpleImputer()
        self.ageImputer.fit(X[['Age']])        
        return self 
        
    def transform(self, X, y=None):
        X['Age'] = self.ageImputer.transform(X[['Age']])
        X['CabinClass'] = X['Cabin'].fillna('M').apply(lambda x: str(x).replace(" ", "")).apply(lambda x: re.sub(r'[^a-zA-Z]', '', x))
        X['CabinNumber'] = X['Cabin'].fillna('M').apply(lambda x: str(x).replace(" ", "")).apply(lambda x: re.sub(r'[^0-9]', '', x)).replace('', 0) 
        X['Embarked'] = X['Embarked'].fillna('M')
        X = X.drop(['PassengerId', 'Name', 'Ticket','Cabin'], axis=1)
        return X

columns = ['PassengerId', 'Pclass', 'Name', 'Sex', 'Age', 'SibSp', 'Parch','Ticket', 'Fare', 'Cabin', 'Embarked']