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这是一个创建于 3540 天前的主题，其中的信息可能已经有所发展或是发生改变。
# -*- coding: utf-8 -*-
from django.utils.encoding import python_2_unicode_compatible
@python_2_unicode_compatible
class Label(models.Model):
width = models.ForeignKey(PaperWidth, verbose_name='宽度')
height = models.ForeignKey(PaperHeight, verbose_name='高度')
def __str__(self):
return u'{0}({1}×{2}）'.format(self.paper_type, self.width, self.height)
这个是一个 python 2.7，django1.8 的程序
之前 verbose_name=u'宽度' 在添加 @python_2_unicode_compatible 就去掉u了，没有问题
但下面的 return u'{0}({1}×{2}）' 为什么不能去掉呢？去掉就报错
'ascii' codec can't decode byte 0xe9 in position 0
第 1 条附言 · 2015-04-21 01:36:44 +08:00
```
def python_2_unicode_compatible(klass):
"""
A decorator that defines __unicode__ and __str__ methods under Python 2.
Under Python 3 it does nothing.
To support Python 2 and 3 with a single code base, define a __str__ method
returning text and apply this decorator to the class.
"""
if six.PY2:
if '__str__' not in klass.__dict__:
raise ValueError("@python_2_unicode_compatible cannot be applied "
"to %s because it doesn't define __str__()." %
klass.__name__)
klass.__unicode__ = klass.__str__
klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
return klass
```
def python_2_unicode_compatible(klass):
"""
A decorator that defines __unicode__ and __str__ methods under Python 2.
Under Python 3 it does nothing.
To support Python 2 and 3 with a single code base, define a __str__ method
returning text and apply this decorator to the class.
"""
if six.PY2:
if '__str__' not in klass.__dict__:
raise ValueError("@python_2_unicode_compatible cannot be applied "
"to %s because it doesn't define __str__()." %
klass.__name__)
klass.__unicode__ = klass.__str__
klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
return klass
```
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1
ryd994 2015-04-21 01:26:14 +08:00
python3大法好 utf8保平安
其实是）是全角字符的原因 换成)就好 |
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2
ryd994 2015-04-21 01:26:50 +08:00
另外乘号也是，别告诉我你不知道要用*
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3
twor2 OP |
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4
twor2 OP ```
def python_2_unicode_compatible(klass): """ A decorator that defines __unicode__ and __str__ methods under Python 2. Under Python 3 it does nothing. To support Python 2 and 3 with a single code base, define a __str__ method returning text and apply this decorator to the class. """ if six.PY2: if '__str__' not in klass.__dict__: raise ValueError("@python_2_unicode_compatible cannot be applied " "to %s because it doesn't define __str__()." % klass.__name__) klass.__unicode__ = klass.__str__ klass.__str__ = lambda self: self.__unicode__().encode('utf-8') return klass ``` |
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5
twor2 OP 看不懂~~
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7
zerh925 2015-04-21 09:35:26 +08:00  1
可以试试'宽度'.encode('utf-8')
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8
iamxi 2015-04-21 10:09:36 +08:00 1
如果你用win8或以上，如果你的系统用户名是中文，如果你安装了阿里旺旺，我告诉你个秘密，你还会更痛苦。所以啊，要么在linux上开发，要么换python3吧。不然你会发现各种因为字符集问题引起的古怪的问题。比如pip不能安装，及时安装上了，pip也不能安装其他模块，等等。。。。
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9
angeloce 2015-04-21 10:56:44 +08:00 1
原因很简单, python_2_unicode_compatible里写着呢.
通过__dict__得到函数内所有的变量, 不是unicode的就decode. 但是return xxxx 是在__dict__里得不到的, 你可以改成 result='{0}({1}×{2}）'; return result 试试, 应该就可以了 P.S. django提供这种工具好无聊, python2还是尽量在字符前加u |
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11
twor2 OP |
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13
no13bus 2015-04-22 12:18:27 +08:00
@twor2 奥。没用过Python3. 不太清楚。编码问题自己搞明白了就好。3和2的区别不仅仅是编码。尽量用大家都用的版本，否则遇到问题了，不好解决
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