I'm trying to create a cart with django.
I created a class:
class Cart(object):
def __init__(self, request):
self.session = request.session
cart = self.session.get(settings.CART_SESSION_ID)
if not cart:
cart = self.session[settings.CART_SESSION_ID] = {}
self.cart = cart
and it raises to me unsupported operand type(s) for +: 'float' and 'str' error.
My settings.py:
CART_SESSION_ID = 'cart'
My cart.py
from django.conf import settings
from Products.models import Product
class Cart(object):
def __init__(self, request):
self.session = request.session
cart = self.session.get(settings.CART_SESSION_ID)
if not cart:
cart = self.session[settings.CART_SESSION_ID] = {}
self.cart = cart
def __iter__(self):
for p in self.cart.keys():
self.cart[str(p)]['product'] = Product.objects.get(pk=p)
def __len__(self):
return sum(item['quantity'] for item in self.cart.values())
def save(self):
self.session[settings.CART_SESSION_ID] = self.cart
self.session.modified = True
def add(self, product_id, quantity=1, update_quantity=False):
product_id = str(product_id)
if product_id not in self.cart:
self.cart[product_id] = {'quantity': 1, 'id': product_id}
if update_quantity:
self.cart[product_id]['quantity'] += int(quantity)
if self.cart[product_id]['quantity'] == 0:
self.remove(product_id)
self.save()
def remove(self, product_id):
if product_id in self.cart:
del self.cart[product_id]
self.save()
My Views.py:
def add_to_cart(request,product_id):
cart = Cart(request)
cart.add(product_id)
return render(request,'menu_cart.html')
I don't know what is wrong with the code.
Full Traceback:
TypeError at /
unsupported operand type(s) for +: 'float' and 'str'
Request Method: GET
Request URL: http://127.0.0.1:8000/
Django Version: 4.0.4
Exception Type: TypeError
Exception Value:
unsupported operand type(s) for +: 'float' and 'str'
Exception Location: C:\Users\dirim\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\sessions\middleware.py, line 53, in process_response
Python Executable: C:\Users\dirim\AppData\Local\Programs\Python\Python39\python.exe
Python Version: 3.9.10
Python Path:
['E:\\Dev\\byGobi RF',
'C:\\Users\\dirim\\AppData\\Local\\Programs\\Python\\Python39\\python39.zip',
'C:\\Users\\dirim\\AppData\\Local\\Programs\\Python\\Python39\\DLLs',
'C:\\Users\\dirim\\AppData\\Local\\Programs\\Python\\Python39\\lib',
'C:\\Users\\dirim\\AppData\\Local\\Programs\\Python\\Python39',
'C:\\Users\\dirim\\AppData\\Local\\Programs\\Python\\Python39\\lib\\site-packages']
Server time: Wed, 15 Jun 2022 18:39:46 +0000
Traceback Switch to copy-and-paste view
C:\Users\dirim\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\exception.py, line 55, in inner
response = get_response(request) …
Local vars
C:\Users\dirim\AppData\Local\Programs\Python\Python39\lib\site-packages\django\utils\deprecation.py, line 136, in __call__
response = self.process_response(request, response) …
Local vars
C:\Users\dirim\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\sessions\middleware.py, line 53, in process_response
expires_time = time.time() + max_age …
Local vars
Request information
USER
AnonymousUser
GET
No GET data
POST
No POST data
FILES
No FILES data
COOKIES
Variable Value
cart
'{}'
csrftoken
'2WVGzPyidIsa6LP5Fn8bVHZmtI1QDONsVRUyaq4u8fGp0KTjTPnR1fFubjXCBlYI'
META
Variable Value
ALLUSERSPROFILE
'C:\\ProgramData'
APPDATA
'C:\\Users\\dirim\\AppData\\Roaming'
CHROME_CRASHPAD_PIPE_NAME
'\\\\.\\pipe\\crashpad_11920_DHTWEFQRMNZOKAMV'
COLORTERM
'truecolor'
COMMONPROGRAMFILES
'C:\\Program Files\\Common Files'
COMMONPROGRAMFILES(X86)
'C:\\Program Files (x86)\\Common Files'
COMMONPROGRAMW6432
'C:\\Program Files\\Common Files'
COMPUTERNAME
'BERKANT'
COMSPEC
'C:\\WINDOWS\\system32\\cmd.exe'
CONTENT_LENGTH
''
CONTENT_TYPE
'text/plain'
CSRF_COOKIE
'2WVGzPyidIsa6LP5Fn8bVHZmtI1QDONsVRUyaq4u8fGp0KTjTPnR1fFubjXCBlYI'
DJANGO_SETTINGS_MODULE
'byGobi.settings'
DRIVERDATA
'C:\\Windows\\System32\\Drivers\\DriverData'
GATEWAY_INTERFACE
'CGI/1.1'
HOMEDRIVE
'C:'
HOMEPATH
'\\Users\\dirim'
HTTP_ACCEPT
'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9'
HTTP_ACCEPT_ENCODING
'gzip, deflate, br'
HTTP_ACCEPT_LANGUAGE
'tr-TR'
HTTP_CONNECTION
'keep-alive'
HTTP_COOKIE
('cart={}; '
'csrftoken=2WVGzPyidIsa6LP5Fn8bVHZmtI1QDONsVRUyaq4u8fGp0KTjTPnR1fFubjXCBlYI')
HTTP_HOST
'127.0.0.1:8000'
HTTP_SEC_FETCH_DEST
'document'
HTTP_SEC_FETCH_MODE
'navigate'
HTTP_SEC_FETCH_SITE
'none'
HTTP_SEC_FETCH_USER
'?1'
HTTP_SEC_GPC
'1'
HTTP_UPGRADE_INSECURE_REQUESTS
'1'
HTTP_USER_AGENT
('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like '
'Gecko) Chrome/102.0.5005.115 Safari/537.36')
LANG
'tr_TR.UTF-8'
LOCALAPPDATA
'C:\\Users\\dirim\\AppData\\Local'
LOGONSERVER
'\\\\BERKANT'
NUMBER_OF_PROCESSORS
'4'
ONEDRIVE
'C:\\Users\\dirim\\OneDrive'
ORIGINAL_XDG_CURRENT_DESKTOP
'undefined'
OS
'Windows_NT'
PATH
('C:\\Program Files (x86)\\NVIDIA Corporation\\PhysX\\Common;C:\\Program Files '
'(x86)\\Common '
'Files\\Oracle\\Java\\javapath;C:\\ProgramData\\Oracle\\Java\\javapath;C:\\WINDOWS\\system32;C:\\WINDOWS;C:\\WINDOWS\\System32\\Wbem;C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\;C:\\WINDOWS\\System32\\OpenSSH\\;C:\\Users\\dirim\\AppData\\Local\\Programs\\Python\\Python39\\Scripts\\;C:\\Users\\dirim\\AppData\\Local\\Programs\\Python\\Python39\\;C:\\Users\\dirim\\AppData\\Local\\Microsoft\\WindowsApps;;C:\\Users\\dirim\\AppData\\Local\\Programs\\Microsoft '
'VS Code\\bin')
PATHEXT
'.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.CPL'
PATH_INFO
'/'
PROCESSOR_ARCHITECTURE
'AMD64'
PROCESSOR_IDENTIFIER
'AMD64 Family 23 Model 17 Stepping 0, AuthenticAMD'
PROCESSOR_LEVEL
'23'
PROCESSOR_REVISION
'1100'
PROGRAMDATA
'C:\\ProgramData'
PROGRAMFILES
'C:\\Program Files'
PROGRAMFILES(X86)
'C:\\Program Files (x86)'
PROGRAMW6432
'C:\\Program Files'
PSMODULEPATH
('C:\\Users\\dirim\\Documents\\WindowsPowerShell\\Modules;C:\\Program '
'Files\\WindowsPowerShell\\Modules;C:\\WINDOWS\\system32\\WindowsPowerShell\\v1.0\\Modules')
PUBLIC
'C:\\Users\\Public'
QUERY_STRING
''
REMOTE_ADDR
'127.0.0.1'
REMOTE_HOST
''
REQUEST_METHOD
'GET'
RUN_MAIN
'true'
SCRIPT_NAME
''
SERVER_NAME
'Berkant'
SERVER_PORT
'8000'
SERVER_PROTOCOL
'HTTP/1.1'
SERVER_SOFTWARE
'WSGIServer/0.2'
SESSIONNAME
'Console'
SYSTEMDRIVE
'C:'
SYSTEMROOT
'C:\\WINDOWS'
TEMP
'C:\\Users\\dirim\\AppData\\Local\\Temp'
TERM_PROGRAM
'vscode'
TERM_PROGRAM_VERSION
'1.68.1'
TMP
'C:\\Users\\dirim\\AppData\\Local\\Temp'
USERDOMAIN
'BERKANT'
USERDOMAIN_ROAMINGPROFILE
'BERKANT'
USERNAME
'dirim'
USERPROFILE
'C:\\Users\\dirim'
WINDIR
'C:\\WINDOWS'
wsgi.errors
<_io.TextIOWrapper name='<stderr>' mode='w' encoding='utf-8'>
wsgi.file_wrapper
<class 'wsgiref.util.FileWrapper'>
wsgi.input
<django.core.handlers.wsgi.LimitedStream object at 0x0000023B90CF61C0>
wsgi.multiprocess
False
wsgi.multithread
True
wsgi.run_once
False
wsgi.url_scheme
'http'
wsgi.version
(1, 0)
Settings
Using settings module byGobi.settings
Setting Value
ABSOLUTE_URL_OVERRIDES
{}
ADMINS
[]
ALLOWED_HOSTS
[]
APPEND_SLASH
True
AUTHENTICATION_BACKENDS
['django.contrib.auth.backends.ModelBackend']
AUTH_PASSWORD_VALIDATORS
'********************'
AUTH_USER_MODEL
'auth.User'
BASE_DIR
WindowsPath('E:/Dev/byGobi RF')
CACHES
{'default': {'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'}}
CACHE_MIDDLEWARE_ALIAS
'default'
CACHE_MIDDLEWARE_KEY_PREFIX
'********************'
CACHE_MIDDLEWARE_SECONDS
600
CART_SESSION_ID
'cart'
CSRF_COOKIE_AGE
31449600
CSRF_COOKIE_DOMAIN
None
CSRF_COOKIE_HTTPONLY
False
CSRF_COOKIE_NAME
'csrftoken'
CSRF_COOKIE_PATH
'/'
CSRF_COOKIE_SAMESITE
'Lax'
CSRF_COOKIE_SECURE
False
CSRF_FAILURE_VIEW
'django.views.csrf.csrf_failure'
CSRF_HEADER_NAME
'HTTP_X_CSRFTOKEN'
CSRF_TRUSTED_ORIGINS
[]
CSRF_USE_SESSIONS
False
DATABASES
{'default': {'ATOMIC_REQUESTS': False,
'AUTOCOMMIT': True,
'CONN_MAX_AGE': 0,
'ENGINE': 'django.db.backends.sqlite3',
'HOST': '',
'NAME': WindowsPath('E:/Dev/byGobi RF/db.sqlite3'),
'OPTIONS': {},
'PASSWORD': '********************',
'PORT': '',
'TEST': {'CHARSET': None,
'COLLATION': None,
'MIGRATE': True,
'MIRROR': None,
'NAME': None},
'TIME_ZONE': None,
'USER': ''}}
DATABASE_ROUTERS
[]
DATA_UPLOAD_MAX_MEMORY_SIZE
2621440
DATA_UPLOAD_MAX_NUMBER_FIELDS
1000
DATETIME_FORMAT
'N j, Y, P'
DATETIME_INPUT_FORMATS
['%Y-%m-%d %H:%M:%S',
'%Y-%m-%d %H:%M:%S.%f',
'%Y-%m-%d %H:%M',
'%m/%d/%Y %H:%M:%S',
'%m/%d/%Y %H:%M:%S.%f',
'%m/%d/%Y %H:%M',
'%m/%d/%y %H:%M:%S',
'%m/%d/%y %H:%M:%S.%f',
'%m/%d/%y %H:%M']
DATE_FORMAT
'N j, Y'
DATE_INPUT_FORMATS
['%Y-%m-%d',
'%m/%d/%Y',
'%m/%d/%y',
'%b %d %Y',
'%b %d, %Y',
'%d %b %Y',
'%d %b, %Y',
'%B %d %Y',
'%B %d, %Y',
'%d %B %Y',
'%d %B, %Y']
DEBUG
True
DEBUG_PROPAGATE_EXCEPTIONS
False
DECIMAL_SEPARATOR
'.'
DEFAULT_AUTO_FIELD
'django.db.models.AutoField'
DEFAULT_CHARSET
'utf-8'
DEFAULT_EXCEPTION_REPORTER
'django.views.debug.ExceptionReporter'
DEFAULT_EXCEPTION_REPORTER_FILTER
'django.views.debug.SafeExceptionReporterFilter'
DEFAULT_FILE_STORAGE
'django.core.files.storage.FileSystemStorage'
DEFAULT_FROM_EMAIL
'webmaster@localhost'
DEFAULT_INDEX_TABLESPACE
''
DEFAULT_TABLESPACE
''
DISALLOWED_USER_AGENTS
[]
EMAIL_BACKEND
'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST
'localhost'
EMAIL_HOST_PASSWORD
'********************'
EMAIL_HOST_USER
''
EMAIL_PORT
25
EMAIL_SSL_CERTFILE
None
EMAIL_SSL_KEYFILE
'********************'
EMAIL_SUBJECT_PREFIX
'[Django] '
EMAIL_TIMEOUT
None
EMAIL_USE_LOCALTIME
False
EMAIL_USE_SSL
False
EMAIL_USE_TLS
False
FILE_UPLOAD_DIRECTORY_PERMISSIONS
None
FILE_UPLOAD_HANDLERS
['django.core.files.uploadhandler.MemoryFileUploadHandler',
'django.core.files.uploadhandler.TemporaryFileUploadHandler']
FILE_UPLOAD_MAX_MEMORY_SIZE
2621440
FILE_UPLOAD_PERMISSIONS
420
FILE_UPLOAD_TEMP_DIR
None
FIRST_DAY_OF_WEEK
0
FIXTURE_DIRS
[]
FORCE_SCRIPT_NAME
None
FORMAT_MODULE_PATH
None
FORM_RENDERER
'django.forms.renderers.DjangoTemplates'
IGNORABLE_404_URLS
[]
INSTALLED_APPS
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'byGobi',
'Accounts',
'Cart',
'Products',
'Shop',
'Pages',
'Dashboard']
INTERNAL_IPS
[]
LANGUAGES
[('af', 'Afrikaans'),
('ar', 'Arabic'),
('ar-dz', 'Algerian Arabic'),
('ast', 'Asturian'),
('az', 'Azerbaijani'),
('bg', 'Bulgarian'),
('be', 'Belarusian'),
('bn', 'Bengali'),
('br', 'Breton'),
('bs', 'Bosnian'),
('ca', 'Catalan'),
('cs', 'Czech'),
('cy', 'Welsh'),
('da', 'Danish'),
('de', 'German'),
('dsb', 'Lower Sorbian'),
('el', 'Greek'),
('en', 'English'),
('en-au', 'Australian English'),
('en-gb', 'British English'),
('eo', 'Esperanto'),
('es', 'Spanish'),
('es-ar', 'Argentinian Spanish'),
('es-co', 'Colombian Spanish'),
('es-mx', 'Mexican Spanish'),
('es-ni', 'Nicaraguan Spanish'),
('es-ve', 'Venezuelan Spanish'),
('et', 'Estonian'),
('eu', 'Basque'),
('fa', 'Persian'),
('fi', 'Finnish'),
('fr', 'French'),
('fy', 'Frisian'),
('ga', 'Irish'),
('gd', 'Scottish Gaelic'),
('gl', 'Galician'),
('he', 'Hebrew'),
('hi', 'Hindi'),
('hr', 'Croatian'),
('hsb', 'Upper Sorbian'),
('hu', 'Hungarian'),
('hy', 'Armenian'),
('ia', 'Interlingua'),
('id', 'Indonesian'),
('ig', 'Igbo'),
('io', 'Ido'),
('is', 'Icelandic'),
('it', 'Italian'),
('ja', 'Japanese'),
('ka', 'Georgian'),
('kab', 'Kabyle'),
('kk', 'Kazakh'),
('km', 'Khmer'),
('kn', 'Kannada'),
('ko', 'Korean'),
('ky', 'Kyrgyz'),
('lb', 'Luxembourgish'),
('lt', 'Lithuanian'),
('lv', 'Latvian'),
('mk', 'Macedonian'),
('ml', 'Malayalam'),
('mn', 'Mongolian'),
('mr', 'Marathi'),
('ms', 'Malay'),
('my', 'Burmese'),
('nb', 'Norwegian Bokmål'),
('ne', 'Nepali'),
('nl', 'Dutch'),
('nn', 'Norwegian Nynorsk'),
('os', 'Ossetic'),
('pa', 'Punjabi'),
('pl', 'Polish'),
('pt', 'Portuguese'),
('pt-br', 'Brazilian Portuguese'),
('ro', 'Romanian'),
('ru', 'Russian'),
('sk', 'Slovak'),
('sl', 'Slovenian'),
('sq', 'Albanian'),
('sr', 'Serbian'),
('sr-latn', 'Serbian Latin'),
('sv', 'Swedish'),
('sw', 'Swahili'),
('ta', 'Tamil'),
('te', 'Telugu'),
('tg', 'Tajik'),
('th', 'Thai'),
('tk', 'Turkmen'),
('tr', 'Turkish'),
('tt', 'Tatar'),
('udm', 'Udmurt'),
('uk', 'Ukrainian'),
('ur', 'Urdu'),
('uz', 'Uzbek'),
('vi', 'Vietnamese'),
('zh-hans', 'Simplified Chinese'),
('zh-hant', 'Traditional Chinese')]
LANGUAGES_BIDI
['he', 'ar', 'ar-dz', 'fa', 'ur']
LANGUAGE_CODE
'en-us'
LANGUAGE_COOKIE_AGE
None
LANGUAGE_COOKIE_DOMAIN
None
LANGUAGE_COOKIE_HTTPONLY
False
LANGUAGE_COOKIE_NAME
'django_language'
LANGUAGE_COOKIE_PATH
'/'
LANGUAGE_COOKIE_SAMESITE
None
LANGUAGE_COOKIE_SECURE
False
LOCALE_PATHS
[]
LOGGING
{}
LOGGING_CONFIG
'logging.config.dictConfig'
LOGIN_REDIRECT_URL
'/accounts/profile/'
LOGIN_URL
'/accounts/login/'
LOGOUT_REDIRECT_URL
None
MANAGERS
[]
MEDIA_ROOT
'E:\\Dev\\byGobi RF\\media'
MEDIA_URL
'/media/'
MESSAGE_STORAGE
'django.contrib.messages.storage.fallback.FallbackStorage'
MIDDLEWARE
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
MIGRATION_MODULES
{}
MONTH_DAY_FORMAT
'F j'
NUMBER_GROUPING
0
PASSWORD_HASHERS
'********************'
PASSWORD_RESET_TIMEOUT
'********************'
PREPEND_WWW
False
ROOT_URLCONF
'byGobi.urls'
SECRET_KEY
'********************'
SECURE_CONTENT_TYPE_NOSNIFF
True
SECURE_CROSS_ORIGIN_OPENER_POLICY
'same-origin'
SECURE_HSTS_INCLUDE_SUBDOMAINS
False
SECURE_HSTS_PRELOAD
False
SECURE_HSTS_SECONDS
0
SECURE_PROXY_SSL_HEADER
None
SECURE_REDIRECT_EXEMPT
[]
SECURE_REFERRER_POLICY
'same-origin'
SECURE_SSL_HOST
None
SECURE_SSL_REDIRECT
False
SERVER_EMAIL
'root@localhost'
SESSION_CACHE_ALIAS
'default'
SESSION_COOKIE_AGE
'86400'
SESSION_COOKIE_DOMAIN
None
SESSION_COOKIE_HTTPONLY
True
SESSION_COOKIE_NAME
'sessionid'
SESSION_COOKIE_PATH
'/'
SESSION_COOKIE_SAMESITE
'Lax'
SESSION_COOKIE_SECURE
False
SESSION_ENGINE
'django.contrib.sessions.backends.db'
SESSION_EXPIRE_AT_BROWSER_CLOSE
False
SESSION_FILE_PATH
None
SESSION_SAVE_EVERY_REQUEST
False
SESSION_SERIALIZER
'django.contrib.sessions.serializers.JSONSerializer'
SETTINGS_MODULE
'byGobi.settings'
SHORT_DATETIME_FORMAT
'm/d/Y P'
SHORT_DATE_FORMAT
'm/d/Y'
SIGNING_BACKEND
'django.core.signing.TimestampSigner'
SILENCED_SYSTEM_CHECKS
[]
STATICFILES_DIRS
['E:\\Dev\\byGobi RF\\static/']
STATICFILES_FINDERS
['django.contrib.staticfiles.finders.FileSystemFinder',
'django.contrib.staticfiles.finders.AppDirectoriesFinder']
STATICFILES_STORAGE
'django.contrib.staticfiles.storage.StaticFilesStorage'
STATIC_ROOT
None
STATIC_URL
'/static/'
TEMPLATES
[{'APP_DIRS': True,
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': ['templates'],
'OPTIONS': {'context_processors': ['django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
'byGobi.context_processors.cart']}}]
TEST_NON_SERIALIZED_APPS
[]
TEST_RUNNER
'django.test.runner.DiscoverRunner'
THOUSAND_SEPARATOR
','
TIME_FORMAT
'P'
TIME_INPUT_FORMATS
['%H:%M:%S', '%H:%M:%S.%f', '%H:%M']
TIME_ZONE
'UTC'
USE_DEPRECATED_PYTZ
False
USE_I18N
True
USE_L10N
True
USE_THOUSAND_SEPARATOR
False
USE_TZ
True
USE_X_FORWARDED_HOST
False
USE_X_FORWARDED_PORT
False
WSGI_APPLICATION
'byGobi.wsgi.application'
X_FRAME_OPTIONS
'DENY'
YEAR_MONTH_FORMAT
'F Y'
Likely you have set the SESSION_COOKIE_AGE setting [Django-doc] as a string, like '1209600', whereas it should be a number, so:
# settings.py
SESSION_COOKIE_AGE = 1209600 # 🖘 not a string (i.e. not '1209600')