imaplib fails during login

[e3cd80c0-0d1c-412a-b4b4-5e542ba3ba75]

BPO	6897
Superseder	bpo-6734: Imap lib implicit conversion from bytes to string

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = None closed_at = created_at = labels = ['type-bug', 'library'] title = 'imaplib fails during login' updated_at = user = 'https://bugs.python.org/debatem1' ``` bugs.python.org fields: ```python activity = actor = 'r.david.murray' assignee = 'none' closed = True closed_date = closer = 'r.david.murray' components = ['Library (Lib)'] creation = creator = 'debatem1' dependencies = [] files = [] hgrepos = [] issue_num = 6897 keywords = [] message_count = 2.0 messages = ['92552', '92593'] nosy_count = 2.0 nosy_names = ['marcin.bachry', 'debatem1'] pr_nums = [] priority = 'normal' resolution = 'duplicate' stage = 'resolved' status = 'closed' superseder = '6734' type = 'behavior' url = 'https://bugs.python.org/issue6897' versions = ['Python 3.0'] ```

[e3cd80c0-0d1c-412a-b4b4-5e542ba3ba75]

Getting the following issue- this code:

! /usr/bin/env python3

import getpass, imaplib

M = imaplib.IMAP4_SSL("imap.gmail.com")
M.login(<username>, <password>)
M.select()
typ, data = M.search(None, 'ALL')
for num in data[0].split():
    typ, data = M.fetch(num, '(RFC822)')
    print('Message %s\n%s\n' % (num, data[0][1]))
M.close()
M.logout()

taken almost verbatim from the documentation, produces this error:

Traceback (most recent call last):
  File "./imaptest.py", line 6, in <module>
    M.login(<username>, <password>)
  File "/usr/lib/python3.0/imaplib.py", line 514, in login
    typ, dat = self._simple_command('LOGIN', user, self._quote(password))
  File "/usr/lib/python3.0/imaplib.py", line 1072, in _quote
    arg = arg.replace(b'\\', b'\\\\')
TypeError: Can't convert 'bytes' object to str implicitly

username and password obviously redeacted.

Changing imaplib.py's _quote function to this:

    def _quote(self, arg):

        arg = arg.replace('\\', '\\\\')
        arg = arg.replace('"', '\\"')

    return '"' + arg + '"'

seems to resolve the issue.

[9e89b5ce-59b9-4f86-875b-af975c2c464d]

Looks like duplicate of bpo-6734.