From cba51003de23ecefaaeb231f2adda19ea589d286 Mon Sep 17 00:00:00 2001
From: Tim Graham <timograham@gmail.com>
Date: Mon, 5 Feb 2018 13:16:57 -0500
Subject: [2.0.x] Refs #28814 -- Fixed migrations crash with namespace packages
 on Python 3.7.

Due to https://bugs.python.org/issue32303.

Backport of 0f0a07ac278dc2be6da81e519188f77e2a2a00cf from master
---
 django/db/migrations/loader.py     | 5 +++--
 django/db/migrations/questioner.py | 3 ++-
 docs/releases/2.0.7.txt            | 3 +++
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/django/db/migrations/loader.py b/django/db/migrations/loader.py
index 8a1cf431bd..a6fe1afc15 100644
--- a/django/db/migrations/loader.py
+++ b/django/db/migrations/loader.py
@@ -84,8 +84,9 @@ class MigrationLoader:
                     continue
                 raise
             else:
-                # PY3 will happily import empty dirs as namespaces.
-                if not hasattr(module, '__file__'):
+                # Empty directories are namespaces.
+                # getattr() needed on PY36 and older (replace w/attribute access).
+                if getattr(module, '__file__', None) is None:
                     self.unmigrated_apps.add(app_config.label)
                     continue
                 # Module is not a package (e.g. migrations.py).
diff --git a/django/db/migrations/questioner.py b/django/db/migrations/questioner.py
index 9b5b9f3510..0fd377ec14 100644
--- a/django/db/migrations/questioner.py
+++ b/django/db/migrations/questioner.py
@@ -43,7 +43,8 @@ class MigrationQuestioner:
         except ImportError:
             return self.defaults.get("ask_initial", False)
         else:
-            if hasattr(migrations_module, "__file__"):
+            # getattr() needed on PY36 and older (replace with attribute access).
+            if getattr(migrations_module, "__file__", None):
                 filenames = os.listdir(os.path.dirname(migrations_module.__file__))
             elif hasattr(migrations_module, "__path__"):
                 if len(migrations_module.__path__) > 1:
diff --git a/docs/releases/2.0.7.txt b/docs/releases/2.0.7.txt
index 8d06deb226..ee54f396fb 100644
--- a/docs/releases/2.0.7.txt
+++ b/docs/releases/2.0.7.txt
@@ -16,3 +16,6 @@ Bugfixes
   ``ModelAdmin.ordering`` (:ticket:`29428`).
 
 * Fixed ``__regex`` and ``__iregex`` lookups with MySQL 8 (:ticket:`29451`).
+
+* Fixed migrations crash with namespace packages on Python 3.7
+  (:ticket:`28814`).
-- 
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