flake8 - misc flake8 errs.

* unused variables
* variables in loops overshadowing imports
* excepts with no defined exc type (tried to avoid `except Exception` too)
* history mapper is still too complex
* default variables should never be mutable

app/dao/annual_billing_dao.py

@@ -35,7 +35,7 @@ def dao_update_annual_billing_for_current_and_future_years(service_id, free_sms_
     if not financial_year_start:
         financial_year_start = get_current_financial_year_start_year()
 
-    updated = AnnualBilling.query.filter(
+    AnnualBilling.query.filter(
         AnnualBilling.service_id == service_id,
         AnnualBilling.financial_year_start >= financial_year_start
     ).update(

app/dao/services_dao.py

@@ -318,22 +318,22 @@ def dao_fetch_monthly_historical_stats_for_service(service_id, year):
     )
 
     months = {
-        datetime.strftime(date, '%Y-%m'): {
+        datetime.strftime(created_date, '%Y-%m'): {
             template_type: dict.fromkeys(
                 NOTIFICATION_STATUS_TYPES,
                 0
             )
             for template_type in TEMPLATE_TYPES
         }
-        for date in [
+        for created_date in [
             datetime(year, month, 1) for month in range(4, 13)
         ] + [
             datetime(year + 1, month, 1) for month in range(1, 4)
         ]
     }
 
-    for notification_type, status, date, count in rows:
-        months[datetime.strftime(date, "%Y-%m")][notification_type][status] = count
+    for notification_type, status, created_date, count in rows:
+        months[datetime.strftime(created_date, "%Y-%m")][notification_type][status] = count
 
     return months
 

app/delivery/send_to_providers.py

@@ -7,6 +7,7 @@ from notifications_utils.recipients import (
     validate_and_format_email_address
 )
 from notifications_utils.template import HTMLEmailTemplate, PlainTextEmailTemplate, SMSMessageTemplate
+from requests.exceptions import HTTPError
 
 from app import clients, statsd_client, create_uuid
 from app.dao.notifications_dao import (
@@ -60,7 +61,7 @@ def send_sms_to_provider(notification):
             update_notification(notification, provider)
             try:
                 send_sms_response(provider.get_name(), str(notification.id), notification.to)
-            except:
+            except HTTPError:
                 # when we retry, we only do anything if the notification is in created - it's currently in sending,
                 # so set it back so that we actually attempt the callback again
                 notification.sent_at = None

app/history_meta.py

@@ -33,7 +33,7 @@ def _is_versioning_col(col):
     return "version_meta" in col.info
 
 
-def _history_mapper(local_mapper):
+def _history_mapper(local_mapper):  # noqa (C901 too complex)
     cls = local_mapper.class_
 
     # set the "active_history" flag

app/schemas.py

@@ -33,9 +33,9 @@ from app.utils import get_template_instance
 def _validate_positive_number(value, msg="Not a positive integer"):
     try:
         page_int = int(value)
-        if page_int < 1:
+    except ValueError:
         raise ValidationError(msg)
-    except:
+    if page_int < 1:
         raise ValidationError(msg)
 
 

app/service/sender.py

@@ -7,7 +7,9 @@ from app.models import EMAIL_TYPE, KEY_TYPE_NORMAL
 from app.notifications.process_notifications import persist_notification, send_notification_to_queue
 
 
-def send_notification_to_service_users(service_id, template_id, personalisation={}, include_user_fields=[]):
+def send_notification_to_service_users(service_id, template_id, personalisation=None, include_user_fields=None):
+    personalisation = personalisation or {}
+    include_user_fields = include_user_fields or []
     template = dao_get_template_by_id(template_id)
     service = dao_fetch_service_by_id(service_id)
     active_users = dao_fetch_active_users_for_service(service.id)