用于连接（某物），但结果未连接

Question

我期待的结果是

>>> message_to bits('')
''
>>> message_to_bits('hello')
'0110100001100101011011000110110001101111'

但我得到的是空字符串的一个错误，对于字符串，第一个字符只有1和0：

def char_to_bits(char):
    """char_to_bits(char) -> string

    Convert the input ASCII character to an 8 bit string of 1s and 0s.

    >>> char_to_bits('A')
    '01000001'
    """
    result = ''
    char_num = ord(char)
    for index in range(8):
        result = get_bit(char_num, index) + result
    return result

def get_bit(int, position):
    """get_bit(int, position) -> bit

    Return the bit (as a character, '1' or '0') from a given position
    in a given integer (interpreted in base 2).

    The least significant bit is at position 0. The second-least significant
    bit is at position 1, and so forth.

    >>> for pos in range(8):
    ...     print(b.get_bit(167, pos))
    ...
    1
    1
    1
    0
    0
    1
    0
    1
    """
    if int & (1 << position):
        return '1'
    else:
        return '0'

def message_to_bits(message):
    for char in message:
        result="".join(str(bits.char_to_bits(char))) 
    return result

Answer 1

你想加入两次：

def message_to_bits(message):
  return "".join("".join(str(bits.char_to_bits(char))) for char in message)

第一个连接用于字符中的位，第二个连接用于消息中的字符。你知道吗