1. python manage.py createsuperuser will create another superuser, you will be able to log into admin and rememder your username.
2. Yes, why not.

To give a normal user privileges, open a shell with python manage.py shell and try:

from django.contrib.auth.models import User
user = User.objects.get(username='normaluser')
user.is_superuser = True
user.save()

You may try through console:

python manage.py shell

then use following script in shell

from django.contrib.auth.models import User
User.objects.filter(is_superuser=True)

will list you all super users on the system. if you recognize yur username from the list:

usr = User.objects.get(username='your username')
usr.set_password('raw password')
usr.save()

and you set a new password (:

You can create a new superuser with createsuperuser command.

In addition to @JamesO answer that states using

python manage.py changepassword [username]

if you don’t remember your username :

1- while in your project’s main directory access the database (I’m using sqlite3):

sqlite3 db.sqlite3

2- list the content of the auth_user table

SELECT * FROM auth_user ;

3- look for the user that has is_superuser = 1 , in my case it’s admin
screenshot of the command output (I don’t have enough rep points)

This is very good question.

python manage.py changepassword user_name

Example :-

python manage.py changepassword mickey

One of the best ways to retrieve the username and password is to view and update them. The User Model provides a perfect way to do so.

In this case, I’m using Django 1.9

1. Navigate to your root directory i,e. where you "manage.py" file is located using your console or other application such as Git.

2. Retrieve the Python shell using the command "python manage.py shell".

3. Import the User Model by typing the following command
   "from django.contrib.auth.models import User"

4. Get all the users by typing the following command
   "users = User.objects.all()"

5. Print a list of the users
   For Python 2 users use the command "print users"
   For Python 3 users use the command "print(users)"
   The first user is usually the admin.

6. Select the user you wish to change their password e.g.

   "user = users[0]"

7. Set the password

   user.set_password('name_of_the_new_password_for_user_selected')

8. Save the new password

   "user.save()"

Start the server and log in using the username and the updated password.

new setup should first run python manage.py createsuperuser to create user. It seems like there is no default username password to login into admin.

Two ways to do this:

The changepassword management command:

(env) $ python manage.py changepassword <username>

Or (which expands upon a few answers, but works for any extended User model) using the django-admin shell as follows:

(env) $ python manage.py shell

This should bring up the shell command prompt as follows:

Python 3.7.2 (default, Mar 27 2019, 08:44:46) 
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>>

Then you would want the following:

>>> from django.contrib.auth import get_user_model
>>> User = get_user_model()
>>> user = User.objects.get(username='admin@hug.com')
>>> user.set_password('new password')
>>> user.save()
>>> exit()

N.B. Why have I answered this question with this answer?

Because, as mentioned, User = get_user_model() will work for your own custom User models. Using from django.contrib.auth.models import User then User.objects.get(username='username') may throw the following error:

AttributeError: Manager isn't available; 'auth.User' has been swapped for 'users.User'

python manage.py changepassword username

You may try this:

1.Change Superuser password without console

python manage.py changepassword <username>

2.Change Superuser password through console

You may also have answered a setup question wrong and have zero staff members. In which case head to postgres:

obvioustest=# \c [yourdatabasename]
obvioustest=# \x
obvioustest=# select * from auth_user;
-[ RECORD 1 ]+-------------
id           | 1
is_superuser | f
is_staff     | f
...

To fix, edit directly:

update auth_user set is_staff='true' where id=1;

If you forgot create admin user first build one with createsuperuser command on manage.py then change the password.

if you forget your admin then you need to create new user by using

python manage.py createsuperuser <username>

and for password there is CLI command changepassword for django to change user password

python manage.py changepassword <username>

OR

django-admin changepassword <username>

OR Run this code in Django env

from django.contrib.auth.models import User
u = User.objects.get(username='john')
u.set_password('new password')
u.save()

If you’re using custom user model

(venv)your_prj $ ./manage.py shell
>>> from customusers.models import CustomUser
>>> CustomUser.objects.filter(is_superuser=True)
>>> user = CustomUser.objects.get(email="somesuper@sys.com")
>>> user.set_password('@NewPwd')
>>> user.save()
>>> exit()

In case you do not know the usernames as created here. You can get the users as described by @FallenAngel above.

python manage.py shell 
from django.contrib.auth.models import User
usrs = User.objects.filter(is_superuser=True)
#identify the user
your_user = usrs.filter(username="yourusername")[0]
#youruser = usrs.get(username="yourusername")
#then set the password

However in the event that you created your independent user model. A simple case is when you want to use email as a username instead of the default user name. In which case your user model lives somewhere such as your_accounts_app.models then the above solution wont work.
In this case you can instead use the get_user_model method

from django.contrib.auth import get_user_model 
super_users = get_user_model().objects.filter(is_superuser=True)
#proceed to get identify your user
# and set their user password

Another thing that is worth noting is to set your user’s status is_staff as active. At least, that’s what makes it works for me. For more detail, I created another superuser as people explained above. Then I go to the database table auth_user and search for that username to make sure its is_staff flag is set to 1. That finally allowed me to log into admin site.

Create a new superuser with the command “python manage.py createsuperuser”.
Login as the new super user. Click on the ‘users’ link. Then click on the user you want to delete. click on delete user at the end of the form page.

Note – The above process will make changes to the activity logs done by that particular user.

The best way is to just go to your terminal and type

python manage.py createsuperuser

and insert another password and user name again
but u will lost some of your profile that u have created before in most cases.

Just type this command in your command line:

python manage.py changepassword yourusername

use

python manage.py dumpdata

then look at the end you will find the user name

I think,The better way
At the command line

python manage.py createsuperuser

If a reset_password link is needed in the /admin/ website this is the way to go:
https://docs.djangoproject.com/en/3.2/ref/contrib/admin/#adding-a-password-reset-feature

Another way to get the user name (and most of the information) is to access the database directly and read the info from the tables.