python django 基本测试

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python django 基本测试

http://www.runoob.com/django/django-model.html

django-admin startapp TestModel

/models.py

from django.db import models

class Test(models.Model):
name = models.CharField(max_length=20)

settings.py

$ python manage.py makemigrations TestModel # 让 Django 知道我们在我们的模型有一些变更
$ python manage.py migrate TestModel # 创建表结构

##############################1105

https://code.ziqiangxuetang.com/django/django-template2.html

python manage.py startapp learn

urls.py
url(r'^learn', include('learn.urls')),

settings.py

home.html
<!DOCTYPE html>
<html>
<head>
<title> 模板中获取相应的URL - 自强学堂</title>
</head>
<body>
<div>

计算 3 + 4： 
1. 用{% url 'add' %}?a=3&b=4 可以获取到链接：

<a href="{% url 'add' %}?a=3&b=4">add</a> 

2. 用{% url 'add' 3 4 %} 可以获取到链接：

<a href="{% url 'add2' 3 4 %}">add2</a> 

<pre>
# 看一下 urls.py 中的每一条对应的 name
# urls.py

urlpatterns = patterns('',
# Examples:
url(r'^add/$', 'calc.views.add', name='add'),
url(r'^add/(d+)/(d+)/$', 'calc.views.add2', name='add2'),
# url(r'^blog/', include('blog.urls')),

url(r'^admin/', include(admin.site.urls)),
)
</pre>

</div>
</body>
</html>

##views

from django.shortcuts import render
from django.http import HttpResponse

def home(request):
return render(request, 'home.html')

def add(request):
a = request.GET['a']
b = request.GET['b']
c = int(a) + int(b)
return HttpResponse(str(c))

def add2(request, a, b):
c = int(a) + int(b
return HttpResponse(str(c))

####urls

from django.contrib import admin
from django.urls import path
from . import views
from django.conf.urls import url,include

urlpatterns = [
url(r'^$', views.home),
## url(r'^add/(d+)/(d+)/$', views.add, name='add'),
url(r'^add/$', views.add, name='add'),
url(r'^add/(d+)/(d+)/$', views.add2, name='add2'),
]

########1106 监控配置
http://www.cnblogs.com/Cherry-Linux/p/9555812.html
http://blog.51cto.com/haohaozhang/1702518

########1107
https://blog.csdn.net/u013802160/article/details/52240289
https://code.ziqiangxuetang.com/django/django-models.html

pip install D: empmysqlclient-1.3.13-cp36-cp36m-win32.whl

building '_mysql' extension
error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": http://landinghub.visualstudio.com/visual-cpp-build-tools

https://blog.csdn.net/a475952074/article/details/79530009
https://www.lfd.uci.edu/~gohlke/pythonlibs/ for windows

pip install D: emp

solution

进入该网址http://www.lfd.uci.edu/~gohlke/pythonlibs/#twisted

下载twisted对应版本的whl文件Twisted‑17.5.0‑cp36‑cp36m‑win_amd64.whl，cp后面是python版本，amd64代表64位，

运行 pip install C:UsersCRDownloadsTwisted-17.5.0-cp36-cp36m-win_amd64.whl

重新输入pip install scrapy即可

同理可解决wordcloud的报错

grant all on people.* to people identified by 'people'

-new project vitur_env learn_models
-pip install django

django-admin startproject learn_models

cd learn_models
django-admin.py startapp people

#
models.py
from django.db import models

class Person(models.Model):
name = models.CharField(max_length=30)
age = models.IntegerField()

#
python manage.py makemigrations
python manage.py migrate

###models.py

from django.db import models
from django.utils.encoding import python_2_unicode_compatible

@python_2_unicode_compatible
class Author(models.Model):
name = models.CharField(max_length=50)
qq = models.CharField(max_length=10)
addr = models.TextField()
email = models.EmailField()

def __str__(self):
return self.name

@python_2_unicode_compatible
class Article(models.Model):
title = models.CharField(max_length=50)
author = models.ForeignKey(Author)
content = models.TextField()
score = models.IntegerField() # 文章的打分
tags = models.ManyToManyField('Tag')

def __str__(self):
return self.title

@python_2_unicode_compatible
class Tag(models.Model):
name = models.CharField(max_length=50)

def __str__(self):
return self.name

#######debug:
$python manage.py shell
from blog.models import Article, Author, Tag
from django.db.models import Sum
from blog.models import *

str(Author.objects.all().query)
str(Author.objects.filter(name="WeizhongTu").query)

Article.objects.filter(author__name='zhe').values_list('title', flat=True)
Tag.objects.all().extra(select={'tag_name': 'name'}).query.__str__()
Tag.objects.all().extra(select={'tag_name': 'name'}).defer('name').query.__str__()
Article.objects.all().values('author_id').annotate(count=Count('author')).values('author_id', 'count').query.__str__()

Article.objects.all().values('author__name').annotate(count=Count('author')).values('author__name', 'count').query.__str__()

articles = Article.objects.all().select_related('author')[:10]

articles = Article.objects.all().prefetch_related('tags')[:10]

articles = Article.objects.all()[:3]
for a in articles:
...: a.title, a.tags.all()

$ python manage.py dbshell

SQLite version 3.14.0 2016-07-26 15:17:14
Enter ".help" for usage hints.
sqlite> select name from blog_author limit 1;

############
>>>from django.db import models
>>> from blog.models import Article1
>>> from blog.fields import ListField

>>> a = Article1()
a.labels
>>> a.labels.append('Django')
>>> a.labels.append('custom fields')

>>> a.labels
['Django', 'custom fields']

>>> type(a.labels)
<type 'list'>

>>> a.content = u'我正在写一篇关于自定义Django Fields的教程'
>>> a.save()

###############test.py
from django.db import models
import ast

class ListField(models.TextField):
### __metaclass__ = models.SubfieldBase
#### description = "Stores a python list"

def __init__(self, *args, **kwargs):
super(ListField, self).__init__(*args, **kwargs)

def to_python(self, value):
if not value:
value = []

if isinstance(value, list):
return value

return ast.literal_eval(value)

def get_prep_value(self, value):
if value is None:
return value

return str(value)

def value_to_string(self, obj):
value = self._get_val_from_obj(obj)
return self.get_db_prep_value(value)

class Dummy(models.Model):
mylist = ListField()

>>> from blog.test import Dummy, ListField
>>> d = Dummy()
>>> d.mylist
''
>>> d.mylist = [3,4,5,6,7,8]
>>> d.mylist
[3, 4, 5, 6, 7, 8]
>>> f = ListField()
>>> f.get_prep_value(d.mylist)
'[3, 4, 5, 6, 7, 8]'
type(d.mylist)
<class 'list'>

########

##debug
settings.py 尾部加上

LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'handlers': {
'console': {
'class': 'logging.StreamHandler',
},
},
'loggers': {
'django.db.backends': {
'handlers': ['console'],
'level': 'DEBUG' if DEBUG else 'INFO',
},
},
}

##########3
show table status from class_7 like 'test_info';

##########
https://zhidao.baidu.com/question/1435716091315804459.html
append方法是列表（list）方法，你定义的类型是一个字符串（str），字符串没有append方法。字符串添加元素和列表添加元素

上面的a是字符串，b是列表

#######

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原文地址：https://www.cnblogs.com/feiyun8616/p/9936444.html