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This is really a big code bulder.
This piece of code here makes no sense inside the manage.py
from django.http import request
server = request.META.get('wsgi.file_wrapper', None)
if server is not None and server.__module__ == 'django.core.servers.basehttp':
print('inside dev')
Perhaps you copied it from somewhere, and didn’t put it where it belongs.
This piece of coude would belong in a view. It will never work inside manage.py, and makes asolutely no sense there.
[EDIT]
ALSO, in a view, you should NOT include the import, or you’ll get the same error. That means, don’t include this from django.http import request
Source:stackexchange.com