[Fixed]-How do I save authenticated user in a cookie in django?

Error is happening here: https://github.com/django/django/blob/stable/1.10.x/django/contrib/auth/init.py#L101

in user.pk is user not a user object but a str object. and underlying problem is apparently that you are redefining str somewhere in your code as a variable or/and as a result, you are passing a string object to login() instead of a user object

check where it is and fix it