问题描述
在 API 文档中，http://docs.python.org/2/library/unicodedata.html#unicodedata.normalize.它说
On the API doc, http://docs.python.org/2/library/unicodedata.html#unicodedata.normalize. It says
返回 Unicode 字符串 unistr 的标准形式 form.表单的有效值为‘NFC’、‘NFKC’、‘NFD’和‘NFKD’.`
文档相当模糊，有人可以用一些例子解释valid values吗?
The documentation is rather vague, can someone explain the valid values with some examples?
推荐答案
我觉得文档很清楚，但这里有一些代码示例:
I find the documentation pretty clear, but here are a few code examples:
from unicodedata import normalize
print '%r' % normalize('NFD', u'u00C7') # decompose: convert Ç to "C + ̧"
print '%r' % normalize('NFC', u'Cu0327') # compose: convert "C + ̧" to Ç
'D' (=decompose) 两种形式都将单个组合字符(如 ä)转换为两个字符(a + 两个点).'C' (=compose) 两种形式都是相反的.
Both 'D' (=decompose) forms convert a single combined character (like ä) into two characters (a + two dots). Both 'C' (=compose) forms do the reverse.
这两个K"形式用于转换添加到 Unicode 的字符以实现兼容性目的.例如，为了支持不能在符号周围画圆圈的软件，有一组带圆圈的数字"，比如①(unicode number 2460).当我们对其应用规范分解 (NFD) 时，它不会做任何事情:
The two "K" forms are used to convert characters added to Unicode for compatibility purposes. For example, to support software that cannot draw circles around symbols, there is a set of "circled numbers", like ① (unicode number 2460). When we apply the canonical decomposition (NFD) to it, it doesn't do anything:
print '%r' % normalize('NFD', u'u2460') # u'u2460'
但是，兼容性分解(NFKD)会返回对应的兼容"字符:
However, the compatibility decomposition (NFKD) will return the corresponding "compatible" character:
print '%r' % normalize('NFKD', u'u2460') # 1
有关详细信息，请参阅 http://en.wikipedia.org/wiki/Unicode_equivalence.
See http://en.wikipedia.org/wiki/Unicode_equivalence for more details.
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