How to update mongodb collections.

Question

My collection structure is:

col1 = {'class':'12', 'roll':[1, 2, 3, 4]}

Now I want to update the collection col1 to

col1 = {'class':'12', 'roll':[1, 2, 3, 4, 5]}

I added another roll number here. How to update this in pymongo.

Answer 1

 db.col1.update( { class : 12}, { $push : { roll : 5 } } )