Removed many uses of bare "except:", which were either going to a) silence real issues, or b) were impossible to hit.

django/contrib/localflavor/hr/forms.py

@@ -4,6 +4,7 @@ HR-specific Form helpers
 """
 from __future__ import absolute_import, unicode_literals
 
+import datetime
 import re
 
 from django.contrib.localflavor.hr.hr_choices import (
@@ -91,17 +92,16 @@ class HRJMBGField(Field):
         dd = int(matches.group('dd'))
         mm = int(matches.group('mm'))
         yyy = int(matches.group('yyy'))
-        import datetime
         try:
-            datetime.date(yyy,mm,dd)
-        except:
+            datetime.date(yyy, mm, dd)
+        except ValueError:
             raise ValidationError(self.error_messages['date'])
 
         # Validate checksum.
         k = matches.group('k')
         checksum = 0
-        for i,j in zip(range(7,1,-1),range(6)):
-            checksum+=i*(int(value[j])+int(value[13-i]))
+        for i, j in zip(range(7, 1, -1), range(6)):
+            checksum += i * (int(value[j]) + int(value[13 - i]))
         m = 11 - checksum % 11
         if m == 10:
             raise ValidationError(self.error_messages['invalid'])

django/contrib/localflavor/ro/forms.py

@@ -4,6 +4,8 @@ Romanian specific form helpers.
 """
 from __future__ import absolute_import, unicode_literals
 
+import datetime
+
 from django.contrib.localflavor.ro.ro_counties import COUNTIES_CHOICES
 from django.core.validators import EMPTY_VALUES
 from django.forms import ValidationError, Field, RegexField, Select
@@ -69,10 +71,9 @@ class ROCNPField(RegexField):
         if value in EMPTY_VALUES:
             return ''
         # check birthdate digits
-        import datetime
         try:
-            datetime.date(int(value[1:3]),int(value[3:5]),int(value[5:7]))
-        except:
+            datetime.date(int(value[1:3]), int(value[3:5]), int(value[5:7]))
+        except ValueError:
             raise ValidationError(self.error_messages['invalid'])
         # checksum
         key = '279146358279'
@@ -118,7 +119,7 @@ class ROCountyField(Field):
         # search for county name
         normalized_CC = []
         for entry in COUNTIES_CHOICES:
-            normalized_CC.append((entry[0],entry[1].upper()))
+            normalized_CC.append((entry[0], entry[1].upper()))
         for entry in normalized_CC:
             if entry[1] == value:
                 return entry[0]
@@ -153,8 +154,8 @@ class ROIBANField(RegexField):
         value = super(ROIBANField, self).clean(value)
         if value in EMPTY_VALUES:
             return ''
-        value = value.replace('-','')
-        value = value.replace(' ','')
+        value = value.replace('-', '')
+        value = value.replace(' ', '')
         value = value.upper()
         if value[0:2] != 'RO':
             raise ValidationError(self.error_messages['invalid'])
@@ -185,10 +186,10 @@ class ROPhoneNumberField(RegexField):
         value = super(ROPhoneNumberField, self).clean(value)
         if value in EMPTY_VALUES:
             return ''
-        value = value.replace('-','')
-        value = value.replace('(','')
-        value = value.replace(')','')
-        value = value.replace(' ','')
+        value = value.replace('-', '')
+        value = value.replace('(', '')
+        value = value.replace(')', '')
+        value = value.replace(' ', '')
         if len(value) != 10:
             raise ValidationError(self.error_messages['invalid'])
         return value
@@ -202,4 +203,3 @@ class ROPostalCodeField(RegexField):
     def __init__(self, max_length=6, min_length=6, *args, **kwargs):
         super(ROPostalCodeField, self).__init__(r'^[0-9][0-8][0-9]{4}$',
                 max_length, min_length, *args, **kwargs)
-

django/core/cache/backends/memcached.py

@@ -141,7 +141,7 @@ class CacheClass(BaseMemcachedCache):
         )
         try:
             import memcache
-        except:
+        except ImportError:
             raise InvalidCacheBackendError(
                 "Memcached cache backend requires either the 'memcache' or 'cmemcache' library"
                 )

django/core/mail/backends/console.py

@@ -21,7 +21,7 @@ class EmailBackend(BaseEmailBackend):
                 stream_created = self.open()
                 for message in email_messages:
                     self.stream.write('%s\n' % message.message().as_string())
-                    self.stream.write('-'*79)
+                    self.stream.write('-' * 79)
                     self.stream.write('\n')
                     self.stream.flush()  # flush after each message
                 if stream_created:

django/db/backends/sqlite3/base.py

@@ -412,7 +412,4 @@ def _sqlite_format_dtdelta(dt, conn, days, secs, usecs):
     return str(dt)
 
 def _sqlite_regexp(re_pattern, re_string):
-    try:
     return bool(re.search(re_pattern, re_string))
-    except:
-        return False

django/http/multipartparser.py

@@ -68,11 +68,10 @@ class MultiPartParser(object):
         if not boundary or not cgi.valid_boundary(boundary):
             raise MultiPartParserError('Invalid boundary in multipart: %s' % boundary)
 
-
         # Content-Length should contain the length of the body we are about
         # to receive.
         try:
-            content_length = int(META.get('HTTP_CONTENT_LENGTH', META.get('CONTENT_LENGTH',0)))
+            content_length = int(META.get('HTTP_CONTENT_LENGTH', META.get('CONTENT_LENGTH', 0)))
         except (ValueError, TypeError):
             content_length = 0
 
@@ -178,7 +177,7 @@ class MultiPartParser(object):
 
                     content_type = meta_data.get('content-type', ('',))[0].strip()
                     try:
-                        charset = meta_data.get('content-type', (0,{}))[1].get('charset', None)
+                        charset = meta_data.get('content-type', (0, {}))[1].get('charset', None)
                     except:
                         charset = None
 

tests/regressiontests/file_uploads/tests.py

@@ -100,7 +100,7 @@ class FileUploadTests(TestCase):
 
         try:
             os.unlink(file1.name)
-        except:
+        except OSError:
             pass
 
         self.assertEqual(response.status_code, 200)

tests/regressiontests/handlers/tests.py

@@ -17,10 +17,8 @@ class HandlerTests(unittest.TestCase):
         # Try running the handler, it will fail in load_middleware
         handler = WSGIHandler()
         self.assertEqual(handler.initLock.locked(), False)
-        try:
+        with self.assertRaises(Exception):
             handler(None, None)
-        except:
-            pass
         self.assertEqual(handler.initLock.locked(), False)
         # Reset settings
         settings.MIDDLEWARE_CLASSES = old_middleware_classes

tests/regressiontests/queries/tests.py

@@ -1677,10 +1677,7 @@ class CloneTests(TestCase):
         list(n_list)
         # Use the note queryset in a query, and evalute
         # that query in a way that involves cloning.
-        try:
         self.assertEqual(ExtraInfo.objects.filter(note__in=n_list)[0].info, 'good')
-        except:
-            self.fail('Query should be clonable')
 
 
 class EmptyQuerySetTests(TestCase):

tests/regressiontests/transactions_regress/tests.py

@@ -1,7 +1,6 @@
 from __future__ import absolute_import
 
-from django.core.exceptions import ImproperlyConfigured
-from django.db import connection, connections, transaction, DEFAULT_DB_ALIAS
+from django.db import connection, connections, transaction, DEFAULT_DB_ALIAS, DatabaseError
 from django.db.transaction import commit_on_success, commit_manually, TransactionManagementError
 from django.test import TransactionTestCase, skipUnlessDBFeature
 from django.test.utils import override_settings
@@ -151,21 +150,14 @@ class TestTransactionClosing(TransactionTestCase):
         # Create a user
         create_system_user()
 
-        try:
-            # The second call to create_system_user should fail for violating a unique constraint
-            # (it's trying to re-create the same user)
+        with self.assertRaises(DatabaseError):
+            # The second call to create_system_user should fail for violating
+            # a unique constraint (it's trying to re-create the same user)
             create_system_user()
-        except:
-            pass
-        else:
-            raise ImproperlyConfigured('Unique constraint not enforced on django.contrib.auth.models.User')
 
-        try:
         # Try to read the database. If the last transaction was indeed closed,
         # this should cause no problems
-            _ = User.objects.all()[0]
-        except:
-            self.fail("A transaction consisting of a failed operation was not closed.")
+        User.objects.all()[0]
 
     @override_settings(DEBUG=True)
     def test_failing_query_transaction_closed_debug(self):