**** yourself as a beginner, felt that these pits occur primarily for two reasons:
low Django version 1. The original book with, now mostly filled with Django2.0, some of which changed the grammar, so the original book Programming even if there will be a lot of good word copy being given
weak base 2. this is not to say.
1. Install virtualenv
The book says anaconda3, the concept of a pip install virtualenv, I just started with did not understand, fiddle for a long time from the anaconda prompt, enter cmd later found in the terminal installation.
2. Establish a virtual environment
The book says, "In the terminal change to the directory", this also checked for a long time, later found to find a suitable place to create a new folder, the mouse into this folder, hold down shift and right mouse button, enter cmd on the line, and then python -m venv 11_env get away. 11_env which is the name of the environment can be changed.
3. Activate the virtual environment
In the windows, so use the "11_env \ Scripts \ activate" is a virtual environment where 11_env name, took himself a name on the line. Will become (11_env) before entering a prompt After activation, the addition of a parentheses activated.
4. Start the server
After python manage.py runserver to start the server, if you modify a file, the server will display real-time status, including error or something.
5. Build URL mapping
References: https: //docs.djangoproject.com/en/3.0/topics/http/urls/
5.1 Naming namespace problems
Operation Note error: Specifying a namespace in include () withou providing an app_name
previous wording
urlpatterns = [
path('admin/', admin.site.urls),
url(r"^users/", include("users.urls", namespace='aaa')),
]
`Now the wording, include the first argument needs to be a two-dimensional Ganso
urlpatterns = [
path('admin/', admin.site.urls),
url(r"^users/", include(("users.urls", 'users'), namespace='aaa')),
]
5.2 URL in the '^ $' regular expression problem
在运行服务器时console提示报错：
“WARNINGS:?: (2_0.W001) Your URL pattern ‘^index’ has a route that contains ‘(?P<’, begins with a ‘^’, or ends with a ‘$’. This was likely an oversight when migrating to django.urls.path().”
See the original solution to this link: https: //blog.csdn.net/SilentWu/article/details/88205831
because From Django2.0, urls.py configure different
solution: url function into path, NA ^ , $ route as
the original:
urlpatterns = [
#主页
path('^$', views.index,name='index'),
]
right now:
urlpatterns = [
#主页
path('', views.index,name='index'),
]
5.3 'topics / (? P <topic_id> \ d +) /' problem (P378, the first 18.4.3)
在运行Django过程中，服务器提示：
“WARNINGS:?: (2_0.W001) Your URL pattern ‘^index’ has a route that contains ‘(?P<’, begins with a ‘^’, or ends with a ‘$’. This was likely an oversight when migrating to django.urls.path().”
This problem checked quite a while to resolve. The front end of the original dynamic request path, URLS re_path need to import configuration prior to use.
Original Code (and path to remove the url ^ $):
urlpatterns = [
#主页
path('', views.index,name='index'),
#显示所有的主题
path('topics/',views.topics,name='topics'),
#特定主题的详细页面
path('topics/(?P<topic_id>\d+)/',views.topic,name='topic'),
]
After changing the code:
urlpatterns = [
#主页
path('', views.index,name='index'),
#显示所有的主题
path('topics/',views.topics,name='topics'),
#特定主题的详细页面
re_path('topics/(?P<topic_id>\d+)/',views.topic,name='topic'),
]
Of course, do not forget to import re_path, otherwise will be error, hey hey hey.
from django.urls import path,re_path
This would solve.
6. Set up a user account
6.1 no module named 'django.core.urlresolvers' problem
The solution is: from django.urls import reverse
appears An unexpected error recently migrated from django1.9 to django2.0, the reason is: django2.0 the original django.core.urlresolvers package change for django.urls packets, we need to import packages have changed a bit on it.
6.2form=EntryForm（data=request.POST） invalid character in identifier问题
The reason is found, there is a Chinese character, dizzy. . . . . . .
Add a checked useful links for your reference: https: //www.jianshu.com/p/d53680ccbf50
