python - 奇数字符追加到Python列表的前面

Question

我在 Linux 上运行 python 时遇到问题。我正在尝试学习 python，并想尝试解析一个小的 XML 文件并将标签和数据放入列表中。但每次运行代码时，列表中的每个元素都会附加一个“u”。

[u'world']
defaultdict(<type 'list'>, {u'world': [u'data']})

我的代码如下:

import xml.sax

from collections import defaultdict

class TransformXML(xml.sax.ContentHandler):

def __init__ (self):
    self.start_tag_name = -1
    self.tag_data = -1
    self.myDict = defaultdict(list)
    self.tags = []

def startElement(self, name, attrs):
    self.start_tag_name = name
    print name
    print self.start_tag_name

def characters(self, content):
    if content.strip(' \r\n\t') != "":
        self.tag_data = content.strip(' \r\n\t')
        print self.start_tag_name
        self.tags.append(self.start_tag_name)
        self.myDict[self.start_tag_name].append(content.strip(' \r\n\t'))

def endElement(self, name):
    pass

def __del__ (self):
    if self.myDict:
        del self.myDict
        print "deleteing myDict"

有人知道问题出在哪里吗？

Answer 1

这个“奇怪”的符号基本上意味着字符串或字符是用unicode编码的

例如。如果我有一个字符串 Test:

>>> unicode('Test')
u'Test'
>>> s = unicode('Test')
>>> type(s)
<type 'unicode'>

文档 here

总而言之，根据 python 文档，

...a Unicode string is a sequence of code points, which are numbers from 0 to 0x10ffff. This sequence needs to be represented as a set of bytes (meaning, values from 0-255) in memory. The rules for translating a Unicode string into a sequence of bytes are called an encoding.