python - base64.encodestring 在 python 3 中失败

Question

以下代码在 python 2 机器上成功运行:

base64_str = base64.encodestring('%s:%s' % (username,password)).replace('\n', '')

我正在尝试将它移植到 Python 3，但是当我这样做时遇到以下错误:

>>> a = base64.encodestring('{0}:{1}'.format(username,password)).replace('\n','')
Traceback (most recent call last):
  File "/auto/pysw/cel55/python/3.4.1/lib/python3.4/base64.py", line 519, in _input_type_check
    m = memoryview(s)
TypeError: memoryview: str object does not have the buffer interface

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/auto/pysw/cel55/python/3.4.1/lib/python3.4/base64.py", line 548, in encodestring
    return encodebytes(s)
  File "/auto/pysw/cel55/python/3.4.1/lib/python3.4/base64.py", line 536, in encodebytes
    _input_type_check(s)
  File "/auto/pysw/cel55/python/3.4.1/lib/python3.4/base64.py", line 522, in _input_type_check
    raise TypeError(msg) from err
TypeError: expected bytes-like object, not str

我尝试搜索 encodestring 用法的示例，但找不到合适的文档。我错过了一些明显的东西吗？我在 RHEL 2.6.18-371.11.1.el5 上运行这个

Answer 1

您可以encode() 字符串(将其转换为字节字符串)，然后再将其传递给base64.encodestring。示例 -

base64_str = base64.encodestring(('%s:%s' % (username,password)).encode()).decode().strip()