我如何获得“可见"?Python中组合Unicode字符串的长度? [英] How do I get the "visible" length of a combining Unicode string in Python?

问题描述

如果我有一个包含组合字符的 Python Unicode 字符串，len 会报告一个与看到"的字符数不对应的值.

If I have a Python Unicode string that contains combining characters, len reports a value that does not correspond to the number of characters "seen".

例如，如果我有一个包含上划线和下划线的字符串，例如 u'A\u0332\u0305BC', len(u'A\u0332\u0305BC')报告5；但显示的字符串只有 3 个字符长.

For example, if I have a string with combining overlines and underlines such as u'A\u0332\u0305BC', len(u'A\u0332\u0305BC') reports 5; but the displayed string is only 3 characters long.

如何在 Python 中获取包含组合字形的 Unicode 字符串的可见"(即用户看到的字符串所占据的不同位置的数量)的长度?

How do I get the "visible" — that is, number of distinct positions occupied by the string the user sees — length of a Unicode string containing combining glyphs in Python?

推荐答案

unicodedata 模块 有一个函数 combining 可用于确定单个字符是否为组合字符.如果它返回 0，您可以将该字符视为非组合字符.

The unicodedata module has a function combining that can be used to determine if a single character is a combining character. If it returns 0 you can count the character as non-combining.

import unicodedata
len(u''.join(ch for ch in u'A\u0332\u0305BC' if unicodedata.combining(ch) == 0))

或者，稍微简单一点:

sum(1 for ch in u'A\u0332\u0305BC' if unicodedata.combining(ch) == 0)

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