code: def from_long(v, prefix, base, charset):
      
      ba = bytearray()
      while v > 0:
          try:
              v, mod = divmod(v, base)
              ba.append(charset(mod))
          except Exception:
              raise ValueError(
                  "can't convert to character corresponding to %d" % mod)
      ba.extend([charset(0)] * prefix)
      ba.reverse()
      return bytes(ba)
docs: The inverse of to_long. Convert an integer to an arbitrary base.
      v: the integer value to convert
      prefix: the number of prefixed 0s to include
      base: the new base
      charset: an array indicating a printable character to use for each value.