load venv in manage.py

manage.py

@@ -2,21 +2,30 @@
 import os
 import sys
 
+def activate_venv(base):
+    if os.path.exists(base):
+        old_os_path = os.environ.get('PATH', '')
+        os.environ['PATH'] = os.path.join(base, 'bin') + os.pathsep + old_os_path
+        site_packages = os.path.join(base, 'lib', 'python%s' % sys.version[:3], 'site-packages')
+        prev_sys_path = list(sys.path)
+        import site
+        site.addsitedir(site_packages)
+        sys.real_prefix = sys.prefix
+        sys.prefix = base
+        # Move the added items to the front of the path:
+        new_sys_path = []
+        for item in list(sys.path):
+            if item not in prev_sys_path:
+                new_sys_path.append(item)
+                sys.path.remove(item)
+        sys.path[:0] = new_sys_path
+
+
 if __name__ == "__main__":
+    root_dir = os.path.normpath(os.path.abspath(os.path.dirname(__file__)))
+    activate_venv(os.path.normpath(os.path.join(root_dir, 'venv')))
+
     os.environ.setdefault("DJANGO_SETTINGS_MODULE", "camp.settings")
-    try:
-        from django.core.management import execute_from_command_line
-    except ImportError:
-        # The above import may fail for some other reason. Ensure that the
-        # issue is really that Django is missing to avoid masking other
-        # exceptions on Python 2.
-        try:
-            import django
-        except ImportError:
-            raise ImportError(
-                "Couldn't import Django. Are you sure it's installed and "
-                "available on your PYTHONPATH environment variable? Did you "
-                "forget to activate a virtual environment?"
-            )
-        raise
+    from django.core.management import execute_from_command_line
+
     execute_from_command_line(sys.argv)