Fix quoting in docstring.

accountant/models/users.py

@@ -28,7 +28,7 @@ from . import db
 
 
 class User(UserMixin, db.Model):
-    "Class used to handle users."
+    """Class used to handle users."""
     # pylint: disable=invalid-name
     id = db.Column(db.Integer, primary_key=True)
     email = db.Column(db.String(200), nullable=False, unique=True, index=True)
@@ -41,27 +41,27 @@ class User(UserMixin, db.Model):
 
     @classmethod
     def query(cls):
-        "Return a query for this class."
+        """Return a query for this class."""
         return db.session.query(cls)
 
     @classmethod
     def hash_password(cls, password):
-        "Password hash function."
+        """Password hash function."""
         return crypt.encrypt(password)
 
     def verify_password(self, password):
-        "Verify password passed in argument with the user's one."
+        """Verify password passed in argument with the user's one."""
         return crypt.verify(password, self.password)
 
     def generate_auth_token(self):
-        "Generate authentication token used to identify the session."
+        """Generate authentication token used to identify the session."""
         serializer = Serializer(app.secret_key)
 
         return serializer.dumps({'id': self.id})
 
     @classmethod
     def verify_auth_token(cls, token):
-        "Verify the authentication token and return the associated user."
+        """Verify the authentication token and return the associated user."""
         serializer = Serializer(app.config['SECRET_KEY'])
 
         try: