[Python-checkins] peps: Relax PEP 8's perceived (but incorrect) prohibition against backslashed.

[barry.warsaw]

http://hg.python.org/peps/rev/98f42236d1af
changeset:   4973:98f42236d1af
user:        Barry Warsaw <barry at python.org>
date:        Wed Jul 03 13:26:36 2013 -0400
summary:
  Relax PEP 8's perceived (but incorrect) prohibition against backslashed.

files:
  pep-0008.txt |  18 +++++++++++++++---
  1 files changed, 15 insertions(+), 3 deletions(-)


diff --git a/pep-0008.txt b/pep-0008.txt
--- a/pep-0008.txt
+++ b/pep-0008.txt
@@ -158,9 +158,21 @@
 line continuation inside parentheses, brackets and braces.  Long lines
 can be broken over multiple lines by wrapping expressions in
 parentheses. These should be used in preference to using a backslash
-for line continuation.  Make sure to indent the continued line
-appropriately.  The preferred place to break around a binary operator
-is *after* the operator, not before it.  Some examples::
+for line continuation.
+
+Backslashes may still be appropriate at times.  For example, long,
+multiple ``with``-statements cannot use implicit continuation, so
+backslashes are acceptable::
+
+    with open('/path/to/some/file/you/want/to/read') as file_1, \
+            open('/path/to/some/file/being/written', 'w') as file_2:
+        file_2.write(file_1.read())
+
+Another such case is with ``assert`` statements.
+
+Make sure to indent the continued line appropriately.  The preferred
+place to break around a binary operator is *after* the operator, not
+before it.  Some examples::
 
     class Rectangle(Blob):
 

-- 
Repository URL: http://hg.python.org/peps