Pandas contains condition returns True but want to return as 1 or 0 - creation of a series/dataframe column

I have a data frame with String values in one of its columns. I want to iterate each row in the specified column to see if the value contains the word i'm looking for. If it does i want it to return int value 1 and if it doesn't then 0.

df['2'] = df['Col2'].str.lower().str.contains('word')

I can only get it to return True or False

       Col1                  Col2       
1     hello how are you       0
2     that is a big word      1
3     this word is bad        1
4     tonight tonight         0