diff --git a/api/exceptions.py b/api/exceptions.py
index 74a5949..a3de8bf 100644
--- a/api/exceptions.py
+++ b/api/exceptions.py
@@ -1,5 +1,6 @@
 # coding=UTF-8
 
+
 class ValidationError(Exception):
 
     def __init__(self, message):
diff --git a/api/models/__init__.py b/api/models/__init__.py
index 19d7b4a..0552a64 100644
--- a/api/models/__init__.py
+++ b/api/models/__init__.py
@@ -1,4 +1,4 @@
 from .designer import Designer
 from .category import Category
 from .contract_customer import ContractCustomer
-from .inquiry import Inquiry
\ No newline at end of file
+from .inquiry import Inquiry
diff --git a/api/models/product.py b/api/models/product.py
index 9a6e2a5..0f8e08a 100644
--- a/api/models/product.py
+++ b/api/models/product.py
@@ -27,11 +27,12 @@ class Material(db.Model):
 
     query_class = MaterialQuery
 
-    WALLPAPER_MATERIALS = ['standard-wallpaper', 'self-adhesive-wallpaper', 'premium-wallpaper']
+    WALLPAPER_MATERIALS = ['standard-wallpaper',
+                           'self-adhesive-wallpaper', 'premium-wallpaper']
     CANVAS_MATERIALS = ['standard-canvas']
 
     id = db.Column('materialid', db.Integer, primary_key=True)
-    name =  db.Column('material', db.String(255), nullable=False)
+    name = db.Column('material', db.String(255), nullable=False)
     material_price = db.relationship('MaterialPrice', uselist=False)
 
     @property
@@ -53,11 +54,11 @@ class Material(db.Model):
 
 class MaterialPrice(db.Model):
 
-    __tablename__ = 'v_materialprice';
-
+    __tablename__ = 'v_materialprice'
 
     groupid = db.Column(db.Integer)
-    materialid = db.Column(db.Integer, db.ForeignKey('product-materials.materialid'))
+    materialid = db.Column(db.Integer, db.ForeignKey(
+        'product-materials.materialid'))
     price = db.Column(db.Numeric)
 
     __table_args__ = (db.PrimaryKeyConstraint(groupid, materialid),)