使用with语句和imaplib时需要调用close、logout

Question

使用with语句时，是否需要在imap4class上调用close和logout方法？

docs 没有提供太多上下文。

Changed in version 3.5: Support for the with statement was added.

在另一个非 with example 中，他们调用了两种方法。

这样做吗？

with imaplib.IMAP4_SSL(IMAP) as imap:
    # Do some stuff
    ...
    imap.close()
    imap.logout()

或者只是这个？

with imaplib.IMAP4_SSL(IMAP) as imap:
    # Do some stuff
    ...

Answer 1

IMAP4.__exit__ 呼叫 logout:

def __exit__(self, *args):  # from imaplib.py
    try:
        self.logout()
    except OSError:
        pass

所以你只需要调用close（在with块之外）：

with imaplib.IMAP4_SSL(IMAP) as imap:
    # Do some stuff
    imap.close()

Necessary to call close, logout when using with statement and imaplib