u'\ ufeff'在Python字符串中 [英] u'\ufeff' in Python string

问题描述

出现以下错误:

UnicodeEncodeError: 'ascii' codec can't encode character u'\ufeff' in position 155: ordinal not in range(128)

不确定什么是u'\ufeff'，当我进行网页抓取时会显示.我该如何纠正这种情况? .replace()字符串方法不适用于它.

Not sure what u'\ufeff' is, it shows up when I'm web scraping. How can I remedy the situation? The .replace() string method doesn't work on it.

推荐答案

Unicode字符U+FEFF是字节顺序标记或BOM，用于区分大尾数UTF-16编码之间的区别.如果您使用正确的编解码器解码网页，Python会为您删除它.例子:

The Unicode character U+FEFF is the byte order mark, or BOM, and is used to tell the difference between big- and little-endian UTF-16 encoding. If you decode the web page using the right codec, Python will remove it for you. Examples:

#!python2
#coding: utf8
u = u'ABC'
e8 = u.encode('utf-8')        # encode without BOM
e8s = u.encode('utf-8-sig')   # encode with BOM
e16 = u.encode('utf-16')      # encode with BOM
e16le = u.encode('utf-16le')  # encode without BOM
e16be = u.encode('utf-16be')  # encode without BOM
print 'utf-8     %r' % e8
print 'utf-8-sig %r' % e8s
print 'utf-16    %r' % e16
print 'utf-16le  %r' % e16le
print 'utf-16be  %r' % e16be
print
print 'utf-8  w/ BOM decoded with utf-8     %r' % e8s.decode('utf-8')
print 'utf-8  w/ BOM decoded with utf-8-sig %r' % e8s.decode('utf-8-sig')
print 'utf-16 w/ BOM decoded with utf-16    %r' % e16.decode('utf-16')
print 'utf-16 w/ BOM decoded with utf-16le  %r' % e16.decode('utf-16le')

请注意，EF BB BF是UTF-8编码的BOM.对于UTF-8，它不是必需的，而仅用作签名(通常在Windows上).

Note that EF BB BF is a UTF-8-encoded BOM. It is not required for UTF-8, but serves only as a signature (usually on Windows).

输出:

utf-8     'ABC'
utf-8-sig '\xef\xbb\xbfABC'
utf-16    '\xff\xfeA\x00B\x00C\x00'    # Adds BOM and encodes using native processor endian-ness.
utf-16le  'A\x00B\x00C\x00'
utf-16be  '\x00A\x00B\x00C'

utf-8  w/ BOM decoded with utf-8     u'\ufeffABC'    # doesn't remove BOM if present.
utf-8  w/ BOM decoded with utf-8-sig u'ABC'          # removes BOM if present.
utf-16 w/ BOM decoded with utf-16    u'ABC'          # *requires* BOM to be present.
utf-16 w/ BOM decoded with utf-16le  u'\ufeffABC'    # doesn't remove BOM if present.

请注意，utf-16编解码器需要 BOM出现，否则Python将不知道数据是大端还是小端.

Note that the utf-16 codec requires BOM to be present, or Python won't know if the data is big- or little-endian.

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