Fix backend lint and test

greg/tests/test_utils.py

-from greg.utils import is_valid_id_number, is_valid_so_number
 from django.conf import settings
+from greg.utils import is_valid_id_number, is_valid_so_number
 
 
 def test_so_number():
@@ -12,12 +12,12 @@ def test_so_number():
 def test_not_allow_so_number():
     so_number = "25529312345"
     settings.ALLOW_SO_NUMBERS = False
-    assert is_valid_id_number(so_number) == False
-    assert is_valid_so_number(so_number) == False
+    assert not is_valid_id_number(so_number)
+    assert not is_valid_so_number(so_number)
 
 
 def test_not_valid_so_number():
     so_number = "25529322345"
     settings.ALLOW_SO_NUMBERS = True
-    assert is_valid_id_number(so_number) == False
-    assert is_valid_so_number(so_number) == False
+    assert not is_valid_id_number(so_number)
+    assert not is_valid_so_number(so_number)

greg/utils.py

@@ -40,8 +40,8 @@ def is_valid_so_number(input_digits: str) -> bool:
         return False
     if month > 50:
         SO_NUMBER = True
-        month = _check_month(month)
-        input_digits = day + month + year + pnr
+        month_str = _check_month(month)
+        input_digits = day + month_str + year + pnr
     return SO_NUMBER and _check_birthdate(input_digits, is_dnumber=False)