[Python] Insert a row to pandas dataframe

I have a dataframe:

s1 = pd.Series([5, 6, 7])
s2 = pd.Series([7, 8, 9])

df = pd.DataFrame([list(s1), list(s2)], columns = ["A", "B", "C"])

A B C
0 5 6 7
1 7 8 9

[2 rows x 3 columns]


and I need to add a first row [2, 3, 4] to get:

A B C
0 2 3 4
1 5 6 7
2 7 8 9


I've tried append() and concat() functions but can't find the right way how to do that.

How to add/insert series to dataframe?

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