'How can I convert Ascii into binary length 7?

How can I convert Ascii into binary length 7 this is what i have so far:

f = open("two_cities_ascii.txt")

lines = f.read()

byte_array = lines.encode()

binary_int = int.from_bytes(byte_array, "big")

binary_string = bin(binary_int)

print(binary_string)

f.close


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