def get_bits(self, bin_length=None):
# type: (FFQramEntry) -> str
"""
Get the binary bit representation of data and label
for state basis identification
:return: a bit array
"""
b = self.data + self.label
ba = BitArray(b)
ba = ba.bin.lstrip('0')
ba = ba.zfill(bin_length) if bin_length is not None else ba
return ba