如何检查字符串是 unicode 还是 ascii? [英] How do I check if a string is unicode or ascii?

问题描述

我必须在 Python 中做什么才能确定字符串具有哪种编码?

What do I have to do in Python to figure out which encoding a string has?

推荐答案

在 Python 3 中，所有字符串都是 Unicode 字符序列.有一个 bytes 类型保存原始字节.

In Python 3, all strings are sequences of Unicode characters. There is a bytes type that holds raw bytes.

在 Python 2 中，字符串可能是 str 类型或 unicode 类型.您可以使用以下代码判断哪个:

In Python 2, a string may be of type str or of type unicode. You can tell which using code something like this:

def whatisthis(s):
    if isinstance(s, str):
        print "ordinary string"
    elif isinstance(s, unicode):
        print "unicode string"
    else:
        print "not a string"

这不区分Unicode 或 ASCII"；它只区分 Python 类型.Unicode 字符串可能由纯 ASCII 范围内的字符组成，而字节字符串可能包含 ASCII、编码的 Unicode，甚至非文本数据.

This does not distinguish "Unicode or ASCII"; it only distinguishes Python types. A Unicode string may consist of purely characters in the ASCII range, and a bytestring may contain ASCII, encoded Unicode, or even non-textual data.

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