升级到OSX Mavericks后,我在终端收到此消息:
/usr/bin/python: No module named virtualenvwrapper
virtualenvwrapper.sh: There was a problem running the initialization hooks.
If Python could not import the module virtualenvwrapper.hook_loader,
check that virtualenv has been installed for
VIRTUALENVWRAPPER_PYTHON=/usr/bin/python and that PATH is
set properly.
Run Code Online (Sandbox Code Playgroud) 该文件说,你可以设置trailing_slash=False但你怎么能允许两个端点工作,有或没有结尾的斜线?
我有一个带有 iframe 的页面,可显示 PDF 文件。它在除移动 Chrome 之外的所有浏览器中都能正常工作。当页面打开时,PDF 将下载到手机或平板电脑,并且页面显示为空。有没有办法强制显示文件而不是下载?
Django文档使用此示例来演示多表继承:
from django.db import models
class Place(models.Model):
name = models.CharField(max_length=50)
address = models.CharField(max_length=80)
class Restaurant(Place):
serves_hot_dogs = models.BooleanField(default=False)
serves_pizza = models.BooleanField(default=False)
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如果我最初像这样构建 Restaurant 类:
class Restaurant(models.Model):
name = models.CharField(max_length=50)
address = models.CharField(max_length=80)
serves_hot_dogs = models.BooleanField(default=False)
serves_pizza = models.BooleanField(default=False)
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然后在创建了一堆 Restaurant 对象之后,我意识到使用 MTI 会更好,有没有一种好的方法可以在事后创建父 Place 类并迁移数据?