if statement with startswith is not working in python [closed]

I have column like below:

col1
Q123
Q456
abc
scg

I want to keep only values starting with Q i.e, Q123,Q456 treat other than those values as none.

I tried like below:

data.col1 = data.col1.apply(lambda value: 'none' if not startswith("Q") in str(value) else value)

I am getting NameError: name 'startswith' is not defined

Please,help me where am gone wrong?