I've seen examples online of people using __getattr__ with Django models, but whenever I try I get errors. (Django 1.2.3) I don't have any problems when I am using __getattr__ on normal objects. For example: class Post(object): def __getattr__(self, name): return 42 Works just fine... >>> from blog.models import Post >>> p = Post() >>> p.
我在网上看到使用__getattr__和Django模型的人的例子，但是每当我尝试我会得到错误。 （Django 1.2.3） 当我在普通对象上使用__getattr__时，我没有任何问题。 例如： class Post(object): def __getattr__(self, name): return 42 工作得很好... >>> from blog.models import Post >>> p = Post() >>> p.random 42 现在，当我尝试使用Django模型时： from django.db impo
I've been developing a set of Python scripts that, to keep things simple, manipulate a set of input files using a parser that I wrote specifically for those scripts. The project's design generally looked like this: /project/project/__init__.py /project/project/parser.py /project/project/helperfunctions.py /project/preferences.ini /project/script1.py /project/script2.py Each script call
我一直在开发一组Python脚本，为了简单起见，我使用专门为这些脚本编写的解析器来处理一组输入文件。 该项目的设计通常如下所示： /project/project/__init__.py /project/project/parser.py /project/project/helperfunctions.py /project/preferences.ini /project/script1.py /project/script2.py 每个脚本都会调用helperfunctions.py某些函数来执行诸如读取首选项文件之类的任务 - 对于每个脚本都必须重复的代码。 根本
Should I put the shebang in my Python scripts? In what form? #!/usr/bin/env python or #!/usr/local/bin/python Are these equally portable? Which form is used most? Note: the tornado project uses the shebang. On the other hand the Django project doesn't. The shebang line in any script determines the script's ability to be executed like a standalone executable without typing pyth
我应该把shebang放到我的Python脚本中吗？ 以什么形式？ #!/usr/bin/env python 要么 #!/usr/local/bin/python 这些是否同样便携？ 哪种形式最常用？ 注意：龙卷风项目使用shebang。 另一方面，Django项目没有。 任何脚本中的shebang行决定了脚本能够像独立可执行文件一样执行，而无需事先在终端中键入python ，或者在文件管理器中双击它（如果配置正确）。 这是没有必要的，但通常会放在那里，所以当有人看到在编
What is the idiomatic Python equivalent of this C/C++ code? void foo() { static int counter = 0; counter++; printf("counter is %dn", counter); } specifically, how does one implement the static member at the function level, as opposed to the class level? And does placing the function into a class change anything? A bit reversed, but this should work: def foo(): foo.counter +=
这个C / C ++代码的惯用Python等价物是什么？ void foo() { static int counter = 0; counter++; printf("counter is %dn", counter); } 具体而言，如何在功能级别实现静态成员，而不是类级别？ 并且将函数放入类中是否会改变任何内容？ 有点逆转，但这应该工作： def foo(): foo.counter += 1 print "Counter is %d" % foo.counter foo.counter = 0 如果你想在顶部而不是底部计数器初始化代码，你可
I would very much like to integrate pylint into the build process for my python projects, but I have run into one show-stopper: One of the error types that I find extremely useful--: E1101: *%s %r has no %r member* --constantly reports errors when using common django fields, for example: E1101:125:get_user_tags: Class 'Tag' has no 'objects' member which is caused by this code: def get_user_tag
我非常想将pylint整合到我的python项目的构建过程中，但是我遇到了一个显示限制器：我发现其中一种非常有用的错误类型 - ： E1101: *%s %r has no %r member*在使用常用django字段时不时报告错误，例如： E1101:125:get_user_tags: Class 'Tag' has no 'objects' member 这是由以下代码引起的： def get_user_tags(username): """ Gets all the tags that username has used. Returns a query set. """ return
I've developed this short test/example code, in order to understand better how static methods work in Python. class TestClass: def __init__(self, size): self.size = size def instance(self): print("regular instance method - with 'self'") @staticmethod def static(): print("static instance method - with @staticmethod") def static_class(): p
我已经开发了这个简短的测试/示例代码，以更好地理解静态方法在Python中的工作方式。 class TestClass: def __init__(self, size): self.size = size def instance(self): print("regular instance method - with 'self'") @staticmethod def static(): print("static instance method - with @staticmethod") def static_class(): print("static class method") a =
There are several good explanations on SO about why/when you should use a class method vs a static method, but I've not been able to find an answer for when you would use a static method over no decoration at all. Consider this class Foo(object): @staticmethod def f_static(x): print("static version of f, x={0}".format(x)) def f_standalone(x): print("stan
关于为什么/何时应该使用类方法vs静态方法，有几个很好的解释，但是我一直无法找到什么时候使用静态方法而没有装饰的答案。 考虑这一点 class Foo(object): @staticmethod def f_static(x): print("static version of f, x={0}".format(x)) def f_standalone(x): print("standalone verion of f, x={0}".format(x)) 还有一些输出： >>> F = Foo >>> f = F() >>
I need to step through a Python string one character at a time, but a simple "for" loop gives me UTF-16 code units instead: str = "abcu20acU00010302U0010fffd" for ch in str: code = ord(ch) print("U+{:04X}".format(code)) That prints: U+0061 U+0062 U+0063 U+20AC U+D800 U+DF02 U+DBFF U+DFFD when what I wanted was: U+0061 U+0062 U+0063 U+20AC U+10302 U+10FFFD Is there any way
我需要一次一个字符地浏览一个Python字符串，但是一个简单的“for”循环会给我一个UTF-16代码单元： str = "abcu20acU00010302U0010fffd" for ch in str: code = ord(ch) print("U+{:04X}".format(code)) 打印： U+0061 U+0062 U+0063 U+20AC U+D800 U+DF02 U+DBFF U+DFFD 当我想要的是： U+0061 U+0062 U+0063 U+20AC U+10302 U+10FFFD 有没有什么办法可以让Python给我一系列的Unicode代码点，而不管字符串是如何在
I have a problem with ModelForm. Field "test1" is displayed, but "test2" - is not. Playing with base_fields didn't help. # models.py class Country(models.Model): name = CharField(max_length=100) # admin.py class CountryAdminForm(ModelForm): test1 = forms.CharField('test1') def __init__(self, *args, **kwargs): super(CountryAdminForm, self).__init__
我有一个ModelForm的问题。 显示字段“test1”，但“test2” - 不是。 玩base_fields没有帮助。 # models.py class Country(models.Model): name = CharField(max_length=100) # admin.py class CountryAdminForm(ModelForm): test1 = forms.CharField('test1') def __init__(self, *args, **kwargs): super(CountryAdminForm, self).__init__(*args, **kwargs) self.fields['test2'] = forms.Char
Here's my code: class Publisher(models.Model): name = models.CharField( max_length = 200, unique = True, ) url = models.URLField() def __unicode__(self): return self.name def save(self): pass class Item(models.Model): publisher = models.ForeignKey(Publisher) name = models.CharField( max_length = 200, )
这是我的代码： class Publisher(models.Model): name = models.CharField( max_length = 200, unique = True, ) url = models.URLField() def __unicode__(self): return self.name def save(self): pass class Item(models.Model): publisher = models.ForeignKey(Publisher) name = models.CharField( max_length = 200, ) c