Inserting Rows into an Empty Pandas DF

Question

I have an empty data frame created like so:

df_test = pd.DataFrame(columns=['a', 'b', 'c'])


Empty DataFrame
Columns: [a, b, c]
Index: []

What I want to do, is insert a record so that it looks like this:

     a     b     c
0    1     1     2

Is there a command for this? My search didn't seem to help me out much.