大佬教程收集整理的这篇文章主要介绍了Python多行with语句，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
这在Python 3.9中已修复！
https://github.com/we-like-parsers/pegen/issues/229
with (Dummy() as a,
Dummy() as b,
# my comment explaining why I wanted Dummy() as c
Dummy() as C):
pass
这证明它有效：
Python 3.9.0a6 (default, Jun 20 2020, 14:52:53)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.15.0 -- An enhanced Interactive Python. Type '?' for Help.
In [3]: with (open('x')
...: as f):
...: pass
...:
---------------------------------------------------------------------------
fileNotFoundError TraceBACk (most recent call last)
<ipython-input-3-47d5a51db08b> in <module>
----> 1 with (open('x')
2 as f):
3 pass
4
fileNotFoundError: [Errno 2] No such file or directory: 'x'
In [4]:
Do you really want to exit ([y]/n)? y
wPython 3.8.2 (default, May 8 2020, 20:08:31)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.15.0 -- An enhanced Interactive Python. Type '?' for Help.
In [1]: with (open('x')
...: as f):
...: pass
file "<ipython-input-1-e538abd13934>", line 2
as f):
^
SyntaxError: invalID Syntax
with在python中创建多行的干净方法是什么？我想在一个内打开多个文件with，但它足够靠右，足以在多行上显示。像这样：
class Dummy:
def __enter__(self): pass
def __exit__(self,type,value,traceBACk): pass
with Dummy() as a,Dummy() as b,Dummy() as c:
pass
不幸的是，这是一个SyntaxError。所以我尝试了这个：
with (Dummy() as a,Dummy() as C):
pass
也是语法错误。但是，这可行：
with Dummy() as a,\
Dummy() as c:
pass
但是，如果我想发表评论怎么办？这不起作用：
with Dummy() as a,\
# my comment explaining why I wanted Dummy() as c\
Dummy() as c:
pass
\s的位置也没有任何明显的变化。
有没有一种干净的方法来创建with允许多行注释的多行语句？
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