[Django]-How to find out the request.session sessionid and use it as a variable in Django?

Django sessions save their key in a cookie. At least its middleware extracts it like this:

from django.conf import settings
session_key = request.COOKIES[settings.SESSION_COOKIE_NAME]

in Django >= 1.4 use:

request.session._session_key

This will either get you a session ID or create one for you. If you do dir(request.session), you will get many useful methods.

['TEST_COOKIE_NAME', 'TEST_COOKIE_VALUE', '__class__', '__contains__',
'__delattr__', '__delitem__', '__dict__', '__doc__', '__format__',
'__getattribute__', '__getitem__', '__hash__', '__init__', '__module__',
'__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__',
'__setitem__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 
'_get_new_session_key', '_get_or_create_session_key', '_get_session',
'_get_session_key', '_hash', '_session', '_session_key', 'accessed',
'clear', 'create', 'cycle_key', 'decode', 'delete', 'delete_test_cookie',
'encode', 'exists', 'flush', 'get', 'get_expire_at_browser_close',
'get_expiry_age', 'get_expiry_date', 'has_key', 'items', 'iteritems',
'iterkeys', 'itervalues', 'keys', 'load', 'modified', 'pop', 'save',
'session_key', 'set_expiry', 'set_test_cookie', 'setdefault',
'test_cookie_worked', 'update', 'values']


session_id = request.session._get_or_create_session_key()

To reliably get the session key, you need to make sure the session has been created first. The documentation mentions a .create() session method, which can be used to make sure there’s a session key:

def my_view(request):
    if not request.session.session_key:
        request.session.create()

    print(request.session.session_key)

Use:

request.COOKIES['sessionid']

In Django 1.8:

request.session.session_key

and

request.session._session_key

Both work correctly.

You can get the session key with session_key, _session_key and _get_session_key() in Django Views as shown below. *I use Django 4.2.1:

# "views.py"

from django.http import HttpResponse

def my_view(request):
    print(request.session.session_key) # w85oia6b5yqj5n2t6n7lpwuhw7lt7ti2
    print(request.session._session_key) # w85oia6b5yqj5n2t6n7lpwuhw7lt7ti2
    print(request.session._get_session_key()) # w85oia6b5yqj5n2t6n7lpwuhw7lt7ti2
    return HttpResponse("Test")

And, you can get the session key with request.session.session_keyin Django Templates as shown below:

{# "templates/index.html #}

{{ request.session.session_key }} {# w85oia6b5yqj5n2t6n7lpwuhw7lt7ti2 #}

You can check in your sessions too:

If "var" in request.session:
       Var = request.session['var']
        Return httpResponse("set")
Else:
       Return httpResponse("there isn't")