pandas get rows which are NOT in other dataframe

I’ve two pandas data frames that have some rows in common.

Suppose dataframe2 is a subset of dataframe1.

How can I get the rows of dataframe1 which are not in dataframe2?

df1 = pandas.DataFrame(data = {'col1' : [1, 2, 3, 4, 5], 'col2' : [10, 11, 12, 13, 14]}) 
df2 = pandas.DataFrame(data = {'col1' : [1, 2, 3], 'col2' : [10, 11, 12]})

df1

   col1  col2
0     1    10
1     2    11
2     3    12
3     4    13
4     5    14

df2

   col1  col2
0     1    10
1     2    11
2     3    12

Expected result:

   col1  col2
3     4    13
4     5    14