How to import datetime module in Django? - django

Question

I've learned some basic in Django but I stucked in this tutorial:
http://docs.djangoproject.com/en/dev/intro/tutorial02/#customize-the-admin-change-list
Error found when was_published_today added:
global name 'datetime' is not defined
Some search results suggest me to import datetime module, but I have no idea how to do it.
from django.db import datetime in polls/admin.py or polls/models.py seems useless
This is settings.py:
# Django settings for kaka project.
DEBUG = True
TEMPLATE_DEBUG = DEBUG
ADMINS = (
# ('Your Name', 'your_email#domain.com'),
)
MANAGERS = ADMINS
DATABASE_ENGINE = 'mysql' # 'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' or 'oracle'.
DATABASE_NAME = 'kaka' # Or path to database file if using sqlite3.
DATABASE_USER = 'root' # Not used with sqlite3.
DATABASE_PASSWORD = 'z' # Not used with sqlite3.
DATABASE_HOST = '' # Set to empty string for localhost. Not used with sqlite3.
DATABASE_PORT = '' # Set to empty string for default. Not used with sqlite3.
# Local time zone for this installation. Choices can be found here:
# http://en.wikipedia.org/wiki/List_of_tz_zones_by_name
# although not all choices may be available on all operating systems.
# If running in a Windows environment this must be set to the same as your
# system time zone.
TIME_ZONE = 'America/Chicago'
# Language code for this installation. All choices can be found here:
# http://www.i18nguy.com/unicode/language-identifiers.html
LANGUAGE_CODE = 'en-us'
SITE_ID = 1
# If you set this to False, Django will make some optimizations so as not
# to load the internationalization machinery.
USE_I18N = True
# Absolute path to the directory that holds media.
# Example: "/home/media/media.lawrence.com/"
MEDIA_ROOT = ''
# URL that handles the media served from MEDIA_ROOT. Make sure to use a
# trailing slash if there is a path component (optional in other cases).
# Examples: "http://media.lawrence.com", "http://example.com/media/"
MEDIA_URL = ''
# URL prefix for admin media -- CSS, JavaScript and images. Make sure to use a
# trailing slash.
# Examples: "http://foo.com/media/", "/media/".
ADMIN_MEDIA_PREFIX = '/media/'
# Make this unique, and don't share it with anybody.
SECRET_KEY = '5vqk*i^#8%=nkhy46z9uf7vx#5g*0e6#uons*+gb^iakgg8y$('
# List of callables that know how to import templates from various sources.
TEMPLATE_LOADERS = (
'django.template.loaders.filesystem.load_template_source',
'django.template.loaders.app_directories.load_template_source',
# 'django.template.loaders.eggs.load_template_source',
)
MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
)
ROOT_URLCONF = 'kaka.urls'
TEMPLATE_DIRS = (
"/var/mycode/cina", # Change this to your own directory.
# Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".
# Always use forward slashes, even on Windows.
# Don't forget to use absolute paths, not relative paths.
)
INSTALLED_APPS = (
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'kaka.polls',
'django.contrib.admin'
)
This is polls/models.py:
from django.db import models
class Poll(models.Model):
# ...
def __unicode__(self):
return self.question
question = models.CharField(max_length=200)
def was_published_today(self):
return self.pub_date.date() == datetime.date.today()
was_published_today.short_description = 'Published today?'
pub_date = models.DateTimeField('date published')
class Choice(models.Model):
# ...
def __unicode__(self):
return self.choice
poll = models.ForeignKey(Poll)
choice = models.CharField(max_length=200)
votes = models.IntegerField()
This is polls/admin.py:
from kaka.polls.models import Poll
from kaka.polls.models import Choice
from django.contrib import admin
class ChoiceInline(admin.TabularInline):
model = Choice
extra = 3
class PollAdmin(admin.ModelAdmin):
fieldsets = [
(None, {'fields': ['question']}),
('Date information', {'fields': ['pub_date'], 'classes': ['collapse']}),
]
list_display = ('question', 'pub_date', 'was_published_today')
inlines = [ChoiceInline]
list_filter = ['pub_date']
search_fields = ['question']
date_hierarchy = 'pub_date'
admin.site.register(Poll, PollAdmin)
admin.site.register(Choice)

Answer 1

I needed to import the timezone module in polls/models.py
from django.utils import timezone
in my version of django/python datetime doesn't provide timezone support

Answer 2

In polls/models.py you need to add import datetime in the same manner as from django.db import models.
from django.db import models
import datetime # < add it here
class Poll(models.Model):
# ...
def __unicode__(self):
return self.question
question = models.CharField(max_length=200)
def was_published_today(self):
return self.pub_date.date() == datetime.date.today()
was_published_today.short_description = 'Published today?'
pub_date = models.DateTimeField('date published')
class Choice(models.Model):
# ...
def __unicode__(self):
return self.choice
poll = models.ForeignKey(Poll)
choice = models.CharField(max_length=200)
votes = models.IntegerField()

Answer 3

You can try to add this , import datetime can be able to could'nt work :
from datetime import datetime

Answer 4

Couldn't add this in formatted text to #zack's answer, but it would look like:
polls/models.py
from django.db import models
import datetime
class Poll(models.Model):
# ...
def __unicode__(self):
return self.question

Answer 5

import datetime