在xpath中使用unicode作爲謂詞，使用lxml和python 2.7

Question

我一直在面對的問題是，我有一個帶有Unicode字符串的XML文件，需要通過Python-2.7中的lxml來評估它的Xpath。

# -*- coding: utf-8 -*- 
from lxml import etree 
... 
class Language: 

description = None 

def __init__(self, description): 
    xpath = "//language[./description = '{}']//description/text()".format(description) 
    self.description= lang_xml.xpath(xpath) 
    ... 


lang = Language(u"Norwegian Bokmål") 

給出錯誤：UnicodeEncodeError: 'ascii' codec can't encode character u'\xe5' in position 14: ordinal not in range(128)

Answer 1

停止將它們混合。

xpath = u"//language[./description = '{}']//description/text()".format(description)