[Python] error message when using datetime to convert a string to datetime object

The code is as follows:

for i in range(0,len(df)):
df['date'] = datetime.strptime(df['date'], '%y-%m-%d %H:%M:%S')


I got the error message:

time data '2019-12-06 09:00:00' does not match format '%y-%m-%d %H:%M:%S'

I don't know why it gives me this message and how to handle it?

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