''CustomDF' object has no attribute '_mgr'

I tried to read csv file using class. It showed an error message : 'CustomDF' object has no attribute '_mgr', when I pass df = CustomDF('test.csv'), support needed!

class CustomDF(pd.DataFrame):
    def  __init__(self, filename):
        self = pd.read_csv(filename)

python csv

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''CustomDF' object has no attribute '_mgr'

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