fix pep8 errors in association example

(cherry picked from commit 6aad7fb4217ef294f68f693be5b3137c28184949)

4 files changed, 33 insertions, 20 deletions

diff --git a/examples/association/__init__.py b/examples/association/__init__.py
index 4cd64c22f..dc9593a0e 100644
--- a/examples/association/__init__.py
+++ b/examples/association/__init__.py
@@ -5,4 +5,4 @@ classes that are associated in a many-to-many pattern.
 
 .. autosource::
 
-"""
\ No newline at end of file
+"""
diff --git a/examples/association/basic_association.py b/examples/association/basic_association.py
index 8a8a54ad1..3835e44f2 100644
--- a/examples/association/basic_association.py
+++ b/examples/association/basic_association.py
@@ -14,13 +14,14 @@ of "items", with a particular price paid associated with each "item".
 
 from datetime import datetime
 
-from sqlalchemy import (create_engine, MetaData, Table, Column, Integer,
-    String, DateTime, Float, ForeignKey, and_)
-from sqlalchemy.orm import mapper, relationship, Session
+from sqlalchemy import (create_engine, Column, Integer, String, DateTime,
+                        Float, ForeignKey, and_)
+from sqlalchemy.orm import relationship, Session
 from sqlalchemy.ext.declarative import declarative_base
 
 Base = declarative_base()
 
+
 class Order(Base):
     __tablename__ = 'order'
 
@@ -28,11 +29,12 @@ class Order(Base):
     customer_name = Column(String(30), nullable=False)
     order_date = Column(DateTime, nullable=False, default=datetime.now())
     order_items = relationship("OrderItem", cascade="all, delete-orphan",
-                            backref='order')
+                               backref='order')
 
     def __init__(self, customer_name):
         self.customer_name = customer_name
 
+
 class Item(Base):
     __tablename__ = 'item'
     item_id = Column(Integer, primary_key=True)
@@ -45,8 +47,9 @@ class Item(Base):
 
     def __repr__(self):
         return 'Item(%r, %r)' % (
-                    self.description, self.price
-                )
+            self.description, self.price
+        )
+
 
 class OrderItem(Base):
     __tablename__ = 'orderitem'
@@ -59,6 +62,7 @@ class OrderItem(Base):
         self.price = price or item.price
     item = relationship(Item, lazy='joined')
 
+
 if __name__ == '__main__':
     engine = create_engine('sqlite://')
     Base.metadata.create_all(engine)
diff --git a/examples/association/dict_of_sets_with_default.py b/examples/association/dict_of_sets_with_default.py
index fc4aebfca..4f0ff462d 100644
--- a/examples/association/dict_of_sets_with_default.py
+++ b/examples/association/dict_of_sets_with_default.py
@@ -21,19 +21,24 @@ from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.ext.associationproxy import association_proxy
 import operator
 
+
 class Base(object):
     id = Column(Integer, primary_key=True)
 
+
 Base = declarative_base(cls=Base)
 
+
 class GenDefaultCollection(MappedCollection):
     def __missing__(self, key):
         self[key] = b = B(key)
         return b
 
+
 class A(Base):
     __tablename__ = "a"
-    associations = relationship("B",
+    associations = relationship(
+        "B",
         collection_class=lambda: GenDefaultCollection(operator.attrgetter("key"))
     )
 
@@ -42,6 +47,7 @@ class A(Base):
     association proxy of B.
     """
 
+
 class B(Base):
     __tablename__ = "b"
     a_id = Column(Integer, ForeignKey("a.id"), nullable=False)
@@ -57,13 +63,16 @@ class B(Base):
         if values:
             self.values = values
 
+
 class C(Base):
     __tablename__ = "c"
     b_id = Column(Integer, ForeignKey("b.id"), nullable=False)
     value = Column(Integer)
+
     def __init__(self, value):
         self.value = value
 
+
 if __name__ == '__main__':
     engine = create_engine('sqlite://', echo=True)
     Base.metadata.create_all(engine)
@@ -88,5 +97,3 @@ if __name__ == '__main__':
     session.commit()
 
     print(a1.collections["2"])
-
-
diff --git a/examples/association/proxied_association.py b/examples/association/proxied_association.py
index 7cb4c9338..d5d48819f 100644
--- a/examples/association/proxied_association.py
+++ b/examples/association/proxied_association.py
@@ -9,14 +9,15 @@ to ``OrderItem`` optional.
 
 from datetime import datetime
 
-from sqlalchemy import (create_engine, MetaData, Table, Column, Integer,
-    String, DateTime, Float, ForeignKey, and_)
-from sqlalchemy.orm import mapper, relationship, Session
+from sqlalchemy import (create_engine, Column, Integer, String, DateTime,
+                        Float, ForeignKey)
+from sqlalchemy.orm import relationship, Session
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.ext.associationproxy import association_proxy
 
 Base = declarative_base()
 
+
 class Order(Base):
     __tablename__ = 'order'
 
@@ -24,12 +25,13 @@ class Order(Base):
     customer_name = Column(String(30), nullable=False)
     order_date = Column(DateTime, nullable=False, default=datetime.now())
     order_items = relationship("OrderItem", cascade="all, delete-orphan",
-                            backref='order')
+                               backref='order')
     items = association_proxy("order_items", "item")
 
     def __init__(self, customer_name):
         self.customer_name = customer_name
 
+
 class Item(Base):
     __tablename__ = 'item'
     item_id = Column(Integer, primary_key=True)
@@ -41,9 +43,8 @@ class Item(Base):
         self.price = price
 
     def __repr__(self):
-        return 'Item(%r, %r)' % (
-                    self.description, self.price
-                )
+        return 'Item(%r, %r)' % (self.description, self.price)
+
 
 class OrderItem(Base):
     __tablename__ = 'orderitem'
@@ -56,6 +57,7 @@ class OrderItem(Base):
         self.price = price or item.price
     item = relationship(Item, lazy='joined')
 
+
 if __name__ == '__main__':
     engine = create_engine('sqlite://')
     Base.metadata.create_all(engine)
@@ -99,7 +101,7 @@ if __name__ == '__main__':
 
     # print customers who bought 'MySQL Crowbar' on sale
     orders = session.query(Order).\
-                    join('order_items', 'item').\
-                    filter(Item.description == 'MySQL Crowbar').\
-                    filter(Item.price > OrderItem.price)
+        join('order_items', 'item').\
+        filter(Item.description == 'MySQL Crowbar').\
+        filter(Item.price > OrderItem.price)
     print([o.customer_name for o in orders])