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我有一个 XML 文件test.xml，内容：

<?xml version='1.0' encoding='UTF-8'?>
<Configurations version="1.0">
    <Item name="a" value="avalue" />
    <Item name="b" value="bvalue" />
</Configurations>

我想用 Python ElementTree 改变一些属性值。蟒蛇程序是：

#!/usr/bin/python
#coding=utf-8
###############################################################################
import sys
from xml.etree import ElementTree as ET

a_value = ""
b_value = ""
# Functions to modify the Upgrader configuration files.
def Modify_Config ():
    tree = ET.parse('./test.xml')
    root = tree.getroot()
    for child in root.getiterator():
        childName = child.get('name')
        if 'a' == childName:
            child.set('value', a_value)
        elif 'b' == childName:
            child.set('value', b_value)

tree.write('./test.xml', encoding="UTF-8")
###############################################################################
a_value = sys.argv[1]       
b_value = sys.argv[2]
###############################################################################    
Modify_Config()

当我像这样执行python文件时：Windows命令提示符中的“encode.py测试bvalue”，它以异常结束：

D:\Test_study\python\encode>encode.py 测试 bvalue
Traceback (most recent call last):
File "D:\Test_study\python\encode\encode.py", line 25, in <module>
    Modify_Config()
File "D:\Test_study\python\encode\encode.py", line 20, in Modify_Config
    tree.write('./test.xml', encoding="UTF-8")
File "C:\Python27\lib\xml\etree\ElementTree.py", line 821, in write
    serialize(write, self._root, encoding, qnames, namespaces)
File "C:\Python27\lib\xml\etree\ElementTree.py", line 940, in _serialize_xml
   _serialize_xml(write, e, encoding, qnames, None)
File "C:\Python27\lib\xml\etree\ElementTree.py", line 933, in _serialize_xml
   v = _escape_attrib(v, encoding)
File "C:\Python27\lib\xml\etree\ElementTree.py", line 1091, in _escape_attrib
   return text.encode(encoding, "xmlcharrefreplace")
UnicodeDecodeError: 'ascii' codec can't decode byte 0xb2 in position 0: ordinal
not in range(128)

为什么会出现这个错误？我的操作系统是 Windows 7、64 位

4

1 回答 1

1

字节字符串和 unicode 字符串只有在字符 < 128 时才可交换。元素 sys.argv 内容是 python 2.x 中的字节字符串。此外，它们似乎是用 GB2312 编码的，而不是 UTF-8。因此，您需要明确：

a_value = sys.argv[1].decode('GB2312')
b_value = sys.argv[2].decode('GB2312')
于 2013-08-15T07:42:32.357 回答