python 3.4和xmltodict的问题

Question

我有这个python脚本：

import xmltodict
with open('file.xml') as fd:
    doc = xmltodict.parse(fd.read())

    print("Name=" + doc['Data']['form'][0]['@Name'])
    print("Time=" + doc['Data']['form'][0]['Period']['@Time'])
    print("\tM-1\tM-2\tM-3\tM-4")
    load_m1 = doc['Data']['form'][0]['Value'][0]['val'][0]['#text']
    load_m2 = doc['Data']['form'][0]['Value'][1]['val'][0]['#text']
    load_m3 = doc['Data']['form'][0]['Value'][2]['val'][0]['#text']
    load_m4 = doc['Data']['form'][0]['Value'][3]['val'][0]['#text']

    memory_m1 = doc['Data']['form'][0]['Value'][0]['val'][1]['#text']
    memory_m2 = doc['Data']['form'][0]['Value'][1]['val'][1]['#text']
    memory_m3 = doc['Data']['form'][0]['Value'][2]['val'][1]['#text']
    memory_m4 = doc['Data']['form'][0]['Value'][3]['val'][1]['#text']

    cpu_m1 = doc['Data']['form'][0]['Value'][0]['val'][2]['#text']
    cpu_m2 = doc['Data']['form'][0]['Value'][1]['val'][2]['#text']
    cpu_m3 = doc['Data']['form'][0]['Value'][2]['val'][2]['#text']
    cpu_m4 = doc['Data']['form'][0]['Value'][3]['val'][2]['#text']

    task_m1 = doc['Data']['form'][0]['Value'][0]['val'][3]['#text']
    task_m2 = doc['Data']['form'][0]['Value'][1]['val'][3]['#text']
    task_m3 = doc['Data']['form'][0]['Value'][2]['val'][3]['#text']
    task_m4 = doc['Data']['form'][0]['Value'][3]['val'][3]['#text']

    print("Load\t" + load_m1 + "\t" + load_m2 + "\t" + load_m3 + "\t"+ load_m4)
    print("Memory\t" + memory_m1 + "\t" + memory_m2 + "\t" + memory_m3 + "\t" + memory_m4)
    print("CPU\t" + cpu_m1 + "\t" + cpu_m2 + "\t" + cpu_m3 + "\t" + cpu_m4)
    print("Task\t" + task_m1 + "\t" + task_m2 + "\t" + task_m3 + "\t" + task_m4 )

如果我从python3控制台逐行运行它，没有问题，但是如果我将它保存在一个文件中并以如下方式运行它

$ python3 script.py

它返回以下错误：

Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/xmltodict.py", line 5, in <module>
    import defusedexpat as expat
ImportError: No module named 'defusedexpat'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "xml.py", line 1, in <module>
    import xmltodict
  File "/usr/lib/python3.4/site-packages/xmltodict.py", line 7, in <module>
    from xml.parsers import expat
  File "/home/script.py", line 3, in <module>
    doc = xmltodict.parse(fd.read())
AttributeError: 'module' object has no attribute 'parse'

如果稍后我想从控制台逐行再次运行它，就会发生这种情况：

Python 3.4.3 (default, May  5 2015, 17:58:45)
[GCC 4.9.2] on cygwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import xmltodict
Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/xmltodict.py", line 5, in <module>
    import defusedexpat as expat
ImportError: No module named 'defusedexpat'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.4/site-packages/xmltodict.py", line 7, in <module>
    from xml.parsers import expat
  File "/home/xml.py", line 3, in <module>
    doc = xmltodict.parse(fd.read())
AttributeError: 'module' object has no attribute 'parse'
>>>

我在Ubuntu和cygwin上进行了测试。我是这样安装的:在cygwin下安装'pip3 install xmltodict‘，在Ubuntu下这样安装：'sudo apt-get install python3-xmltodict’

Answer 1

尝试使用以下命令卸载xmltodict包：

sudo pip uninstall xmltodict

或

sudo pip3 uninstall xmltodict

并使用以下命令重新安装。

sudo pip3 install xmltodict