PEP 7: Allow breaking lines before operators ("Knuth's style") (GH-3931)

As discussed in: https://discuss.python.org/t/62402

It doesn't make much sense for C and Python to be different here,
and the reasons for "Knuth's style" in PEP 8 apply to C code as well.

peps/pep-0007.rst

@@ -140,20 +140,24 @@ Code lay-out
                   "cannot create '%.100s' instances",
                   type->tp_name);
 
-* When you break a long expression at a binary operator, the
+* When you break a long expression at a binary operator, braces
-  operator goes at the end of the previous line, and braces should be
+  should be formatted as shown:
-  formatted as shown.  E.g.:
 
   .. code-block::
      :class: good
 
-     if (type->tp_dictoffset != 0 && base->tp_dictoffset == 0 &&
+     if (type->tp_dictoffset != 0
-         type->tp_dictoffset == b_size &&
+         && base->tp_dictoffset == 0
-         (size_t)t_size == b_size + sizeof(PyObject *))
+         && type->tp_dictoffset == b_size
+         && (size_t)t_size == b_size + sizeof(PyObject *))
      {
          return 0; /* "Forgive" adding a __dict__ only */
      }
 
+  It's OK to put operators at ends of lines, especially to be
+  consistent with surrounding code.
+  (See :ref:`PEP 8 <pep8-operator-linebreak>` for a longer discussion.)
+
 * Vertically align line continuation characters in multi-line macros.
 
 * Macros intended to be used as a statement should use the

peps/pep-0008.rst

@@ -257,6 +257,9 @@ Another such case is with ``assert`` statements.
 
 Make sure to indent the continued line appropriately.
 
+
+.. _`pep8-operator-linebreak`:
+
 Should a Line Break Before or After a Binary Operator?
 ------------------------------------------------------