Python - ¿Como se podría separar un archivo html y añadirlo a una lista?

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imagenes_archivo ='Direeción de árchivo'

i = open (imagenes_archivo, 'r')

leer_linea = i.readline()

lista = []

for leer_linea in i:

    a = leer_linea

    if a [0:3] == '<a ':

        lista.append (a)

    else:

        print ('', end='')