ImportError: DLL加载失败 - 尝试导入spynner时

Question

当我运行一段代码，里面引入了 spynner 这个库时，出现了以下错误：

> python .\spynner-test.py
Traceback (most recent call last):
  File ".\spynner-test.py", line 10, in <module>
    import spynner
  File "C:\Anaconda\lib\site-packages\spynner\__init__.py", line 2, in <module>
    from browser import *
  File "C:\Anaconda\lib\site-packages\spynner\browser.py", line 56, in <module>
    from PyQt4.QtNetwork import QNetworkCookie, QNetworkAccessManager, QSslConfiguration, QSslCipher
ImportError: DLL load failed: The specified procedure could not be found.

有趣的是，我在普通的 Python 命令行里引入这些库时没有任何问题：

> python
Python 2.7.5 |Anaconda 1.9.2 (64-bit)| (default, Jul  1 2013, 12:37:52) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyQt4.QtNetwork import QNetworkCookie, QNetworkAccessManager, QSslConfiguration, QSslCipher
>>>

但是在 import spynner 失败之后，

> python
Python 2.7.5 |Anaconda 1.9.2 (64-bit)| (default, Jul  1 2013, 12:37:52) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import spynner
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Anaconda\lib\site-packages\spynner\__init__.py", line 2, in <module>
    from browser import *
  File "C:\Anaconda\lib\site-packages\spynner\browser.py", line 56, in <module>
    from PyQt4.QtNetwork import QNetworkCookie, QNetworkAccessManager, QSslConfiguration, QSslCipher
ImportError: DLL load failed: The specified procedure could not be found.
>>> from PyQt4.QtNetwork import QNetworkCookie, QNetworkAccessManager, QSslConfiguration, QSslCipher
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: DLL load failed: The specified procedure could not be found.
>>>

Answer 1

好的，我搞明白了。问题出在spynner这个库上，它首先尝试导入PySide，但是在从PyQt4.QtNetwork导入QSslConfiguration时出错了。接着，它就切换到PyQt4，但之前导入的PySide导致PyQt4的导入失败。当我把browser.py里的try:部分去掉后，就能顺利导入spynner了。