pip安装python模块，但pythonshell没有看到它

pip列表显示给我看

> PS C:\Python34\Scripts> pip3.4 install --upgrade pyspeak
Requirement already up-to-date: pyspeak in c:\python34\lib\site-packages
Requirement already up-to-date: pytest==2.3.4 in c:\python34\lib\site-packages (from pyspeak)
Requirement already up-to-date: simplejson==3.1.3 in c:\python34\lib\site-packages (from pyspeak)
Requirement already up-to-date: requests==1.2.0 in c:\python34\lib\site-packages (from pyspeak)
Requirement already up-to-date: py>=1.4.12 in c:\python34\lib\site-packages (from pytest==2.3.4->pyspeak)
Cleaning up...
> 

当我尝试使用这个新的cmd shell（也是PowerShell）时，我发现：

> PS C:\Python34\Scripts> pip3.4 list 

 PySpeak (0.1.5)

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请包括完整的终端输出，也包括刚刚尝试安装的python版本，同样的问题。旧版本不会安装。我想这个图书馆坏了。尝试pip安装thingspeak

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>>> import pyspeak
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named 'pyspeak'
>>>