将utf-8字符串作为内容转换为str的unicode

Question

I'm using pyquery to parse a page:

dom = PyQuery('http://zh.wikipedia.org/w/index.php', {'title': 'CSS', 'printable': 'yes', 'variant': 'zh-cn'})
content = dom('#mw-content-text > p').eq(0).text()

but what I get in content is a unicode string with utf-8 encoded content:

u'\xe5\xb1\x82\xe5\x8f\xa0\xe6\xa0\xb7\xe5\xbc\x8f\xe8\xa1\xa8...'

how could I convert it to str without lost the content?

to make it clear:

I want conent == '\\xe5\\xb1\\x82\\xe5\\x8f\\xa0\\xe6\\xa0\\xb7\\xe5\\xbc\\x8f\\xe8\\xa1\\xa8'

not conent == u'\\xe5\\xb1\\x82\\xe5\\x8f\\xa0\\xe6\\xa0\\xb7\\xe5\\xbc\\x8f\\xe8\\xa1\\xa8'

Answer 1

If you have a unicode value with UTF-8 bytes, encode to Latin-1 to preserve the 'bytes':

content = content.encode('latin1')

because the Unicode codepoints U+0000 to U+00FF all map one-on-one with the latin-1 encoding; this encoding thus interprets your data as literal bytes.

For your example this gives me:

>>> content = u'\xe5\xb1\x82\xe5\x8f\xa0\xe6\xa0\xb7\xe5\xbc\x8f\xe8\xa1\xa8'
>>> content.encode('latin1')
'\xe5\xb1\x82\xe5\x8f\xa0\xe6\xa0\xb7\xe5\xbc\x8f\xe8\xa1\xa8'
>>> content.encode('latin1').decode('utf8')
u'\u5c42\u53e0\u6837\u5f0f\u8868'
>>> print content.encode('latin1').decode('utf8')
层叠样式表

PyQuery uses either requests or urllib to retrieve the HTML, and in the case of requests , uses the .text attribute of the response. This auto-decodes the response data based on the encoding set in a Content-Type header alone, or if that information is not available, uses latin-1 for this (for text responses, but HTML is a text response). You can override this by passing in an encoding argument:

dom = PyQuery('http://zh.wikipedia.org/w/index.php', encoding='utf8',
              {'title': 'CSS', 'printable': 'yes', 'variant': 'zh-cn'})

at which point you'd not have to re-encode at all.