excess_3_code.py

defexcess_3_code(number: int) ->str:
"""
 Find excess-3 code of integer base 10.
 Add 3 to all digits in a decimal number then convert to a binary-coded decimal.
 https://en.wikipedia.org/wiki/Excess-3

 >>> excess_3_code(0)
 '0b0011'
 >>> excess_3_code(3)
 '0b0110'
 >>> excess_3_code(2)
 '0b0101'
 >>> excess_3_code(20)
 '0b01010011'
 >>> excess_3_code(120)
 '0b010001010011'
 """
num=""
fordigitinstr(max(0, number)):
num+=str(bin(int(digit) +3))[2:].zfill(4)
return"0b"+num


if__name__=="__main__":
importdoctest

doctest.testmod()