问题：NameError：全局名称“ unicode”未定义-在Python 3中

我正在尝试使用一个名为bidi的Python包。在此程序包（algorithm.py）的模块中，尽管它是程序包的一部分，但仍有一些行会给我带来错误。

以下是这些行：

# utf-8 ? we need unicode
if isinstance(unicode_or_str, unicode):
    text = unicode_or_str
    decoded = False
else:
    text = unicode_or_str.decode(encoding)
    decoded = True

这是错误消息：

Traceback (most recent call last):
  File "<pyshell#25>", line 1, in <module>
    bidi_text = get_display(reshaped_text)
  File "C:\Python33\lib\site-packages\python_bidi-0.3.4-py3.3.egg\bidi\algorithm.py",   line 602, in get_display
    if isinstance(unicode_or_str, unicode):
NameError: global name 'unicode' is not defined

我应该如何重新编写代码的这一部分，使其可以在Python3中使用？另外，如果有人在Python 3中使用了bidi软件包，请让我知道他们是否发现了类似的问题。我感谢您的帮助。

点击查看英文原文

I am trying to use a Python package called bidi. In a module in this package (algorithm.py) there are some lines that give me error, although it is part of the package.

Here are the lines:

# utf-8 ? we need unicode
if isinstance(unicode_or_str, unicode):
    text = unicode_or_str
    decoded = False
else:
    text = unicode_or_str.decode(encoding)
    decoded = True

and here is the error message:

Traceback (most recent call last):
  File "<pyshell#25>", line 1, in <module>
    bidi_text = get_display(reshaped_text)
  File "C:\Python33\lib\site-packages\python_bidi-0.3.4-py3.3.egg\bidi\algorithm.py",   line 602, in get_display
    if isinstance(unicode_or_str, unicode):
NameError: global name 'unicode' is not defined

How should I re-write this part of the code so it works in Python3? Also if anyone have used bidi package with Python 3 please let me know if they have found similar problems or not. I appreciate your help.

回答 0

Python 3将unicode类型重命名为str，旧str类型已替换为bytes。

if isinstance(unicode_or_str, str):
    text = unicode_or_str
    decoded = False
else:
    text = unicode_or_str.decode(encoding)
    decoded = True

您可能需要阅读Python 3 porting HOWTO以获得更多此类详细信息。还有Lennart Regebro的“ 移植到Python 3：深入指南”，可免费在线获得。

最后但并非最不重要的一点是，您可以尝试使用该2to3工具查看如何为您翻译代码。

点击查看英文原文

Python 3 renamed the unicode type to str, the old str type has been replaced by bytes.

if isinstance(unicode_or_str, str):
    text = unicode_or_str
    decoded = False
else:
    text = unicode_or_str.decode(encoding)
    decoded = True

You may want to read the Python 3 porting HOWTO for more such details. There is also Lennart Regebro’s Porting to Python 3: An in-depth guide, free online.

Last but not least, you could just try to use the 2to3 tool to see how that translates the code for you.

回答 1

如果您需要让脚本像我一样继续在python2和3上工作，这可能会对某人有所帮助

import sys
if sys.version_info[0] >= 3:
    unicode = str

然后可以例如

foo = unicode.lower(foo)
点击查看英文原文

If you need to have the script keep working on python2 and 3 as I did, this might help someone

import sys
if sys.version_info[0] >= 3:
    unicode = str

and can then just do for example

foo = unicode.lower(foo)

回答 2

您可以使用6个库同时支持Python 2和3：

import six
if isinstance(value, six.string_types):
    handle_string(value)
点击查看英文原文

You can use the six library to support both Python 2 and 3:

import six
if isinstance(value, six.string_types):
    handle_string(value)

回答 3

希望您使用的是Python 3，默认情况下Str是unicode，所以请Unicode用String Str函数替换函数。

if isinstance(unicode_or_str, str):    ##Replaces with str
    text = unicode_or_str
    decoded = False
点击查看英文原文

Hope you are using Python 3 , Str are unicode by default, so please Replace Unicode function with String Str function.

if isinstance(unicode_or_str, str):    ##Replaces with str
    text = unicode_or_str
    decoded = False
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