Support python3.6

Corrects some warnings and adds tox config.  Adds DeprecationWarning
to the error category.   Large sweep for string literals w/ backslashes
as this is common in docstrings

Co-authored-by: Andrii Soldatenko
Fixes: #3886
Change-Id: Ia7c838dfbbe70b262622ed0803d581edc736e085
Pull-request: https://github.com/zzzeek/sqlalchemy/pull/337

1 files changed, 9 insertions, 9 deletions

diff --git a/lib/sqlalchemy/sql/schema.py b/lib/sqlalchemy/sql/schema.py
index edf939a24..793750f1c 100644
--- a/lib/sqlalchemy/sql/schema.py
+++ b/lib/sqlalchemy/sql/schema.py
@@ -116,7 +116,7 @@ class SchemaItem(SchemaEventTarget, visitors.Visitable):
 
 
 class Table(DialectKWArgs, SchemaItem, TableClause):
-    """Represent a table in a database.
+    r"""Represent a table in a database.
 
     e.g.::
 
@@ -893,7 +893,7 @@ class Column(SchemaItem, ColumnClause):
     __visit_name__ = 'column'
 
     def __init__(self, *args, **kwargs):
-        """
+        r"""
         Construct a new ``Column`` object.
 
         :param name: The name of this column as represented in the database.
@@ -1512,7 +1512,7 @@ class ForeignKey(DialectKWArgs, SchemaItem):
                  initially=None, link_to_name=False, match=None,
                  info=None,
                  **dialect_kw):
-        """
+        r"""
         Construct a column-level FOREIGN KEY.
 
         The :class:`.ForeignKey` object when constructed generates a
@@ -2417,7 +2417,7 @@ class Constraint(DialectKWArgs, SchemaItem):
     def __init__(self, name=None, deferrable=None, initially=None,
                  _create_rule=None, info=None, _type_bound=False,
                  **dialect_kw):
-        """Create a SQL constraint.
+        r"""Create a SQL constraint.
 
         :param name:
           Optional, the in-database name of this ``Constraint``.
@@ -2604,7 +2604,7 @@ class ColumnCollectionConstraint(ColumnCollectionMixin, Constraint):
     """A constraint that proxies a ColumnCollection."""
 
     def __init__(self, *columns, **kw):
-        """
+        r"""
         :param \*columns:
           A sequence of column names or Column objects.
 
@@ -2671,7 +2671,7 @@ class CheckConstraint(ColumnCollectionConstraint):
     def __init__(self, sqltext, name=None, deferrable=None,
                  initially=None, table=None, info=None, _create_rule=None,
                  _autoattach=True, _type_bound=False):
-        """Construct a CHECK constraint.
+        r"""Construct a CHECK constraint.
 
         :param sqltext:
           A string containing the constraint definition, which will be used
@@ -2759,7 +2759,7 @@ class ForeignKeyConstraint(ColumnCollectionConstraint):
                  ondelete=None, deferrable=None, initially=None,
                  use_alter=False, link_to_name=False, match=None,
                  table=None, info=None, **dialect_kw):
-        """Construct a composite-capable FOREIGN KEY.
+        r"""Construct a composite-capable FOREIGN KEY.
 
         :param columns: A sequence of local column names. The named columns
           must be defined and present in the parent Table. The names should
@@ -3278,7 +3278,7 @@ class Index(DialectKWArgs, ColumnCollectionMixin, SchemaItem):
     __visit_name__ = 'index'
 
     def __init__(self, name, *expressions, **kw):
-        """Construct an index object.
+        r"""Construct an index object.
 
         :param name:
           The name of the index
@@ -3704,7 +3704,7 @@ class MetaData(SchemaItem):
                 extend_existing=False,
                 autoload_replace=True,
                 **dialect_kwargs):
-        """Load all available table definitions from the database.
+        r"""Load all available table definitions from the database.
 
         Automatically creates ``Table`` entries in this ``MetaData`` for any
         table available in the database but not yet present in the