Improve code quality

modoboa/core/app_settings.py

@@ -48,8 +48,8 @@ class GeneralParametersForm(param_forms.AdminParametersForm):
     password_scheme = forms.ChoiceField(
         label=ugettext_lazy("Default password scheme"),
         choices=[(hasher.name, ugettext_lazy(hasher.label))
-            for hasher in PasswordHasher.get_password_hashers()
-            if hasher().scheme in get_dovecot_schemes()],
+                 for hasher in PasswordHasher.get_password_hashers()
+                 if hasher().scheme in get_dovecot_schemes()],
         initial="sha512crypt",
         help_text=ugettext_lazy("Scheme used to crypt mailbox passwords"),
         widget=forms.Select(attrs={"class": "form-control"})

modoboa/core/password_hashers/__init__.py

@@ -53,6 +53,7 @@ def get_dovecot_schemes():
         except OSError:
             pass
         else:
-            supported_schemes = ["{{{}}}".format(scheme) for scheme in force_text(schemes).split()]
+            supported_schemes = ["{{{}}}".format(scheme)
+                                 for scheme in force_text(schemes).split()]
 
     return supported_schemes

modoboa/core/password_hashers/base.py

@@ -70,6 +70,7 @@ class PasswordHasher(object):
 
     @classmethod
     def get_password_hashers(cls):
+        """Return all the PasswordHasher supported by Modoboa"""
         return cls.__subclasses__()