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, 7 insertions, 7 deletions

diff --git a/lib/sqlalchemy/events.py b/lib/sqlalchemy/events.py
index 8a6cb2689..2ed44f5dd 100644
--- a/lib/sqlalchemy/events.py
+++ b/lib/sqlalchemy/events.py
@@ -76,7 +76,7 @@ class DDLEvents(event.Events):
     _dispatch_target = SchemaEventTarget
 
     def before_create(self, target, connection, **kw):
-        """Called before CREATE statements are emitted.
+        r"""Called before CREATE statements are emitted.
 
         :param target: the :class:`.MetaData` or :class:`.Table`
          object which is the target of the event.
@@ -92,7 +92,7 @@ class DDLEvents(event.Events):
         """
 
     def after_create(self, target, connection, **kw):
-        """Called after CREATE statements are emitted.
+        r"""Called after CREATE statements are emitted.
 
         :param target: the :class:`.MetaData` or :class:`.Table`
          object which is the target of the event.
@@ -108,7 +108,7 @@ class DDLEvents(event.Events):
         """
 
     def before_drop(self, target, connection, **kw):
-        """Called before DROP statements are emitted.
+        r"""Called before DROP statements are emitted.
 
         :param target: the :class:`.MetaData` or :class:`.Table`
          object which is the target of the event.
@@ -124,7 +124,7 @@ class DDLEvents(event.Events):
         """
 
     def after_drop(self, target, connection, **kw):
-        """Called after DROP statements are emitted.
+        r"""Called after DROP statements are emitted.
 
         :param target: the :class:`.MetaData` or :class:`.Table`
          object which is the target of the event.
@@ -717,7 +717,7 @@ class ConnectionEvents(event.Events):
         """
 
     def handle_error(self, exception_context):
-        """Intercept all exceptions processed by the :class:`.Connection`.
+        r"""Intercept all exceptions processed by the :class:`.Connection`.
 
         This includes all exceptions emitted by the DBAPI as well as
         within SQLAlchemy's statement invocation process, including
@@ -763,7 +763,7 @@ class ConnectionEvents(event.Events):
             @event.listens_for(Engine, "handle_error")
             def handle_exception(context):
                 if isinstance(context.original_exception,
-                    psycopg2.OperationalError) and \\
+                    psycopg2.OperationalError) and \
                     "failed" in str(context.original_exception):
                     raise MySpecialException("failed operation")
 
@@ -786,7 +786,7 @@ class ConnectionEvents(event.Events):
 
             @event.listens_for(Engine, "handle_error", retval=True)
             def handle_exception(context):
-                if context.chained_exception is not None and \\
+                if context.chained_exception is not None and \
                     "special" in context.chained_exception.message:
                     return MySpecialException("failed",
                         cause=context.chained_exception)