diff --git a/budget/api.py b/budget/api.py
index 4ca04f2..ec664b6 100644
--- a/budget/api.py
+++ b/budget/api.py
@@ -1,13 +1,10 @@
 # -*- coding: utf-8 -*-
-from flask import *
+from flask import Blueprint, request
+from flask_rest import RESTResource, need_auth
 
 from models import db, Project, Person, Bill
-from forms import (ProjectForm, EditProjectForm, MemberForm, BillForm,
+from forms import (ProjectForm, EditProjectForm, MemberForm,
                    get_billform_for)
-from utils import for_all_methods
-
-from flask_rest import RESTResource, need_auth
-from werkzeug import Response
 
 
 api = Blueprint("api", __name__, url_prefix="/api")
diff --git a/budget/forms.py b/budget/forms.py
index dccf5fa..ac2c1e2 100644
--- a/budget/forms.py
+++ b/budget/forms.py
@@ -1,9 +1,11 @@
-from flaskext.wtf import *
+from flaskext.wtf import DateField, DecimalField, Email, Form, PasswordField, \
+    Required, SelectField, SelectMultipleField, SubmitField, TextAreaField, \
+    TextField, ValidationError
 from flaskext.babel import lazy_gettext as _
 from flask import request
 
 from wtforms.widgets import html_params
-from models import Project, Person, Bill, db
+from models import Project, Person
 from datetime import datetime
 from jinja2 import Markup
 from utils import slugify
@@ -18,14 +20,16 @@ def select_multi_checkbox(field, ul_class='', **kwargs):
     js_function = u'toggle();'
     options = dict(kwargs, id=choice_id, onclick=js_function)
     label = _("Select All/None")
-    html.append(u'<li><label for="%s">%s<span>%s</span></label></li>' % (choice_id, '<input %s /> ' % html_params(**options), label))
+    html.append(u'<li><label for="%s">%s<span>%s</span></label></li>'
+        % (choice_id, '<input %s /> ' % html_params(**options), label))
 
     for value, label, checked in field.iter_choices():
         choice_id = u'%s-%s' % (field_id, value)
         options = dict(kwargs, name=field.name, value=value, id=choice_id)
         if checked:
             options['checked'] = 'checked'
-        html.append(u'<li><label for="%s">%s<span>%s</span></label></li>' % (choice_id, '<input %s /> ' % html_params(**options), label))
+        html.append(u'<li><label for="%s">%s<span>%s</span></label></li>'
+            % (choice_id, '<input %s /> ' % html_params(**options), label))
     html.append(u'</ul>')
     return u''.join(html)
 
@@ -33,18 +37,20 @@ def select_multi_checkbox(field, ul_class='', **kwargs):
 def get_billform_for(project, set_default=True, **kwargs):
     """Return an instance of BillForm configured for a particular project.
 
-    :set_default: if set to True, on GET methods (usually when we want to 
+    :set_default: if set to True, on GET methods (usually when we want to
                   display the default form, it will call set_default on it.
-    
+
     """
     form = BillForm(**kwargs)
-    form.payed_for.choices = form.payer.choices = [(m.id, m.name) for m in project.active_members]
+    form.payed_for.choices = form.payer.choices = [(m.id, m.name)
+        for m in project.active_members]
     form.payed_for.default = [m.id for m in project.active_members]
 
     if set_default and request.method == "GET":
         form.set_default()
     return form
 
+
 class CommaDecimalField(DecimalField):
     """A class to deal with comma in Decimal Field"""
     def process_formdata(self, value):
@@ -63,8 +69,8 @@ class EditProjectForm(Form):
 
         Returns the created instance
         """
-        project = Project(name=self.name.data, id=self.id.data, 
-                password=self.password.data, 
+        project = Project(name=self.name.data, id=self.id.data,
+                password=self.password.data,
                 contact_email=self.contact_email.data)
         return project
 
@@ -85,7 +91,12 @@ class ProjectForm(EditProjectForm):
     def validate_id(form, field):
         form.id.data = slugify(field.data)
         if Project.query.get(form.id.data):
-            raise ValidationError(Markup(_("The project identifier is used to log in and for the URL of the project. We tried to generate an identifier for you but a project with this identifier already exists. Please create a new identifier you will be able to remember.")))
+            raise ValidationError(Markup(_("The project identifier is used "
+                "to log in and for the URL of the project. "
+                "We tried to generate an identifier for you but a project "
+                "with this identifier already exists. "
+                "Please create a new identifier "
+                "that you will be able to remember.")))
 
 
 class AuthenticationForm(Form):
@@ -108,17 +119,18 @@ class BillForm(Form):
     what = TextField(_("What?"), validators=[Required()])
     payer = SelectField(_("Payer"), validators=[Required()], coerce=int)
     amount = CommaDecimalField(_("Amount paid"), validators=[Required()])
-    payed_for = SelectMultipleField(_("For whom?"), 
+    payed_for = SelectMultipleField(_("For whom?"),
             validators=[Required()], widget=select_multi_checkbox, coerce=int)
     submit = SubmitField(_("Submit"))
     submit2 = SubmitField(_("Submit and add a new one"))
 
     def save(self, bill, project):
-        bill.payer_id=self.payer.data
-        bill.amount=self.amount.data
-        bill.what=self.what.data
-        bill.date=self.date.data
-        bill.owers = [Person.query.get(ower, project) for ower in self.payed_for.data]
+        bill.payer_id = self.payer.data
+        bill.amount = self.amount.data
+        bill.what = self.what.data
+        bill.date = self.date.data
+        bill.owers = [Person.query.get(ower, project)
+            for ower in self.payed_for.data]
 
         return bill
 
@@ -141,7 +153,8 @@ class BillForm(Form):
 
 class MemberForm(Form):
 
-    name = TextField(_("Name"), validators=[Required()], default=_("Type user name here"))
+    name = TextField(_("Name"), validators=[Required()],
+        default=_("Type user name here"))
     submit = SubmitField(_("Add"))
 
     def __init__(self, project, *args, **kwargs):
@@ -163,6 +176,7 @@ class MemberForm(Form):
 
         return person
 
+
 class InviteForm(Form):
     emails = TextAreaField(_("People to notify"))
     submit = SubmitField(_("Send invites"))
@@ -171,11 +185,11 @@ class InviteForm(Form):
         validator = Email()
         for email in [email.strip() for email in form.emails.data.split(",")]:
             if not validator.regex.match(email):
-                raise ValidationError(_("The email %(email)s is not valid", 
+                raise ValidationError(_("The email %(email)s is not valid",
                     email=email))
 
 
 class CreateArchiveForm(Form):
-    start_date = DateField(_("Start date"), validators=[Required(),])
-    end_date = DateField(_("End date"), validators=[Required(),])
+    start_date = DateField(_("Start date"), validators=[Required(), ])
+    end_date = DateField(_("End date"), validators=[Required(), ])
     name = TextField(_("Name for this archive (optional)"))
diff --git a/budget/models.py b/budget/models.py
index 3dcd709..5783703 100644
--- a/budget/models.py
+++ b/budget/models.py
@@ -8,10 +8,13 @@ from sqlalchemy import orm
 
 db = SQLAlchemy()
 
+
 # define models
+
+
 class Project(db.Model):
 
-    _to_serialize = ("id", "name", "password", "contact_email", 
+    _to_serialize = ("id", "name", "password", "contact_email",
             "members", "active_members", "balance")
 
     id = db.Column(db.String, primary_key=True)
@@ -28,25 +31,27 @@ class Project(db.Model):
     @property
     def balance(self):
 
-        balances, should_pay, should_receive = defaultdict(int), defaultdict(int), defaultdict(int)
+        balances, should_pay, should_receive = (defaultdict(int)
+            for time in (1, 2, 3))
 
         # for each person
         for person in self.members:
             # get the list of bills he has to pay
             bills = Bill.query.filter(Bill.owers.contains(person))
             for bill in bills.all():
-                if person != bill.payer: 
+                if person != bill.payer:
                     should_pay[person] += bill.pay_each()
                     should_receive[bill.payer] += bill.pay_each()
 
         for person in self.members:
-            balances[person.id] = round(should_receive[person] - should_pay[person], 2)
+            balance = should_receive[person] - should_pay[person]
+            balances[person.id] = round(balance, 2)
 
         return balances
 
     def has_bills(self):
         """return if the project do have bills or not"""
-        return self.get_bills().count() != 0
+        return self.get_bills().count() > 0
 
     def get_bills(self):
         """Return the list of bills related to this project"""
@@ -95,7 +100,6 @@ class Person(db.Model):
             return Person.query.filter(Person.id == id)\
                 .filter(Project.id == project.id).one()
 
-
     query_class = PersonQuery
 
     _to_serialize = ("id", "name", "activated")
@@ -126,6 +130,7 @@ billowers = db.Table('billowers',
     db.Column('person_id', db.Integer, db.ForeignKey('person.id')),
 )
 
+
 class Bill(db.Model):
 
     class BillQuery(BaseQuery):
@@ -169,6 +174,7 @@ class Bill(db.Model):
         return "<Bill of %s from %s for %s>" % (self.amount,
                 self.payer, ", ".join([o.name for o in self.owers]))
 
+
 class Archive(db.Model):
     id = db.Column(db.Integer, primary_key=True)
     project_id = db.Column(db.String, db.ForeignKey("project.id"))
diff --git a/budget/run.py b/budget/run.py
index 3d57329..9065a34 100644
--- a/budget/run.py
+++ b/budget/run.py
@@ -1,9 +1,9 @@
+from flask import Flask, g, request, session
+from flaskext.babel import Babel
+
 from web import main, db, mail
 from api import api
-import os
 
-from flask import *
-from flaskext.babel import Babel
 
 app = Flask(__name__)
 app.config.from_object("default_settings")
diff --git a/budget/utils.py b/budget/utils.py
index 52fd151..60337fb 100644
--- a/budget/utils.py
+++ b/budget/utils.py
@@ -1,10 +1,10 @@
 import re
-from functools import wraps
 import inspect
 
-from flask import redirect, url_for, session, request
+from flask import redirect
 from werkzeug.routing import HTTPException, RoutingException
 
+
 def slugify(value):
     """Normalizes string, converts to lowercase, removes non-alpha characters,
     and converts spaces to hyphens.
@@ -32,11 +32,3 @@ class Redirect303(HTTPException, RoutingException):
 
     def get_response(self, environ):
         return redirect(self.new_url, 303)
-
-def for_all_methods(decorator):
-    """Apply a decorator to all the methods of a class"""
-    def decorate(cls):
-        for name, method in inspect.getmembers(cls, inspect.ismethod):
-            setattr(cls, name, decorator(method))
-        return cls
-    return decorate
diff --git a/budget/web.py b/budget/web.py
index b8ae71d..6097d80 100644
--- a/budget/web.py
+++ b/budget/web.py
@@ -1,16 +1,3 @@
-from collections import defaultdict
-
-from flask import *
-from flaskext.mail import Mail, Message
-from flaskext.babel import get_locale, gettext as _
-from smtplib import SMTPRecipientsRefused
-import werkzeug
-
-# local modules
-from models import db, Project, Person, Bill
-from forms import *
-from utils import Redirect303
-
 """
 The blueprint for the web interface.
 
@@ -22,9 +9,24 @@ some shortcuts to make your life better when coding (see `pull_project`
 and `add_project_id` for a quick overview)
 """
 
+from flask import Blueprint, current_app, flash, g, redirect, \
+    render_template, request, session, url_for
+from flaskext.mail import Mail, Message
+from flaskext.babel import get_locale, gettext as _
+from smtplib import SMTPRecipientsRefused
+import werkzeug
+
+# local modules
+from models import db, Project, Person, Bill
+from forms import AuthenticationForm, CreateArchiveForm, EditProjectForm, \
+    InviteForm, MemberForm, PasswordReminder, ProjectForm, get_billform_for
+from utils import Redirect303
+
+
 main = Blueprint("main", __name__)
 mail = Mail()
 
+
 @main.url_defaults
 def add_project_id(endpoint, values):
     """Add the project id to the url calls if it is expected.
@@ -36,6 +38,7 @@ def add_project_id(endpoint, values):
     if current_app.url_map.is_endpoint_expecting(endpoint, 'project_id'):
         values['project_id'] = g.project.id
 
+
 @main.url_value_preprocessor
 def pull_project(endpoint, values):
     """When a request contains a project_id value, transform it directly
@@ -51,7 +54,8 @@ def pull_project(endpoint, values):
     if project_id:
         project = Project.query.get(project_id)
         if not project:
-            raise Redirect303(url_for(".create_project", project_id=project_id))
+            raise Redirect303(url_for(".create_project",
+                project_id=project_id))
         if project.id in session and session[project.id] == project.password:
             # add project into kwargs and call the original function
             g.project = project
@@ -60,6 +64,7 @@ def pull_project(endpoint, values):
             raise Redirect303(
                     url_for(".authenticate", project_id=project_id))
 
+
 @main.route("/authenticate", methods=["GET", "POST"])
 def authenticate(project_id=None):
     """Authentication form"""
@@ -68,7 +73,7 @@ def authenticate(project_id=None):
         form.id.data = request.args['project_id']
     project_id = form.id.data
     project = Project.query.get(project_id)
-    create_project = False # We don't want to create the project by default
+    create_project = False  # We don't want to create the project by default
     if not project:
         # But if the user try to connect to an unexisting project, we will
         # propose him a link to the creation form.
@@ -87,7 +92,8 @@ def authenticate(project_id=None):
         if request.method == "POST":
             if form.validate():
                 if not form.password.data == project.password:
-                    form.errors['password'] = [_("This private code is not the right one")]
+                    msg = _("This private code is not the right one")
+                    form.errors['password'] = [msg]
                 else:
                     # maintain a list of visited projects
                     if "projects" not in session:
@@ -102,6 +108,7 @@ def authenticate(project_id=None):
     return render_template("authenticate.html", form=form,
             create_project=create_project)
 
+
 @main.route("/")
 def home():
     project_form = ProjectForm()
@@ -109,6 +116,7 @@ def home():
     return render_template("home.html", project_form=project_form,
             auth_form=auth_form, session=session)
 
+
 @main.route("/create", methods=["GET", "POST"])
 def create_project():
     form = ProjectForm()
@@ -117,9 +125,10 @@ def create_project():
 
     if request.method == "POST":
         # At first, we don't want the user to bother with the identifier
-        # so it will automatically be missing because not displayed into the form
-        # Thus we fill it with the same value as the filled name, the validation will
-        # take care of the slug
+        # so it will automatically be missing because not displayed into
+        # the form
+        # Thus we fill it with the same value as the filled name,
+        # the validation will take care of the slug
         if not form.id.data:
             form.id.data = form.name.data
         if form.validate():
@@ -135,10 +144,11 @@ def create_project():
             # send reminder email
             g.project = project
 
-            message_title = _("You have just created '%(project)s' to share your expenses",
-                    project=g.project.name)
+            message_title = _("You have just created '%(project)s' "
+                "to share your expenses", project=g.project.name)
 
-            message_body = render_template("reminder_mail.%s" % get_locale().language)
+            message_body = render_template("reminder_mail.%s" %
+                get_locale().language)
 
             msg = Message(message_title,
                 body=message_body,
@@ -158,6 +168,7 @@ def create_project():
 
     return render_template("create_project.html", form=form)
 
+
 @main.route("/password-reminder", methods=["GET", "POST"])
 def remind_password():
     form = PasswordReminder()
@@ -167,9 +178,9 @@ def remind_password():
             project = Project.query.get(form.id.data)
 
             # send the password reminder
+            password_reminder = "password_reminder.%s" % get_locale().language
             mail.send(Message("password recovery",
-                body=render_template("password_reminder.%s" % get_locale().language,
-                    project=project),
+                body=render_template(password_reminder, project=project),
                 recipients=[project.contact_email]))
             flash(_("a mail has been sent to you with the password"))
 
@@ -193,18 +204,21 @@ def edit_project():
 
     return render_template("edit_project.html", form=form)
 
+
 @main.route("/<project_id>/delete", methods=["POST"])
 def remove_project():
     g.project.remove_project()
 
     return redirect(url_for(".home"))
 
+
 @main.route("/exit")
 def exit():
     # delete the session
     session.clear()
     return redirect(url_for(".home"))
 
+
 @main.route("/demo")
 def demo():
     """
@@ -222,6 +236,7 @@ def demo():
     session[project.id] = project.password
     return redirect(url_for(".list_bills", project_id=project.id))
 
+
 @main.route("/<project_id>/invite", methods=["GET", "POST"])
 def invite():
     """Send invitations for this particular project"""
@@ -232,10 +247,11 @@ def invite():
         if form.validate():
             # send the email
 
-            message_body = render_template("invitation_mail.%s" % get_locale().language)
+            message_body = render_template("invitation_mail.%s" %
+                get_locale().language)
 
-            message_title = _("You have been invited to share your expenses for %(project)s",
-                    project=g.project.name)
+            message_title = _("You have been invited to share your "
+                "expenses for %(project)s", project=g.project.name)
             msg = Message(message_title,
                 body=message_body,
                 recipients=[email.strip()
@@ -246,9 +262,10 @@ def invite():
 
     return render_template("send_invites.html", form=form)
 
+
 @main.route("/<project_id>/")
 def list_bills():
-    bill_form=get_billform_for(g.project)
+    bill_form = get_billform_for(g.project)
     # set the last selected payer as default choice if exists
     if 'last_selected_payer' in session:
         bill_form.payer.data = session['last_selected_payer']
@@ -260,6 +277,7 @@ def list_bills():
             add_bill=request.values.get('add_bill', False)
     )
 
+
 @main.route("/<project_id>/members/add", methods=["GET", "POST"])
 def add_member():
     # FIXME manage form errors on the list_bills page
@@ -273,6 +291,7 @@ def add_member():
 
     return render_template("add_member.html", form=form)
 
+
 @main.route("/<project_id>/members/<member_id>/reactivate", methods=["POST"])
 def reactivate(member_id):
     person = Person.query.filter(Person.id == member_id)\
@@ -294,6 +313,7 @@ def remove_member(member_id):
 
     return redirect(url_for(".list_bills"))
 
+
 @main.route("/<project_id>/add", methods=["GET", "POST"])
 def add_bill():
     form = get_billform_for(g.project)
@@ -353,6 +373,7 @@ def edit_bill(bill_id):
 
     return render_template("add_bill.html", form=form, edit=True)
 
+
 @main.route("/lang/<lang>")
 def change_lang(lang):
     session['lang'] = lang
@@ -360,11 +381,13 @@ def change_lang(lang):
 
     return redirect(request.headers.get('Referer') or url_for('.home'))
 
+
 @main.route("/<project_id>/compute")
 def compute_bills():
     """Compute the sum each one have to pay to each other and display it"""
     return render_template("compute_bills.html")
 
+
 @main.route("/<project_id>/archives/create")
 def create_archive():
     form = CreateArchiveForm()
@@ -375,6 +398,7 @@ def create_archive():
 
     return render_template("create_archive.html", form=form)
 
+
 @main.route("/dashboard")
 def dashboard():
     return render_template("dashboard.html", projects=Project.query.all())