我正在尝试在 Windows 上使用 easy_install 安装“pwd”模块并遇到以下错误，谁能帮助解决这个错误？
C:\Dropbox\scripts>easy_install pwd
Searching for pwd
Reading http://pypi.python.org/simple/pwd/
Couldn't find index page for 'pwd' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading http://pypi.python.org/simple/
No local packages or download links found for pwd
Best match: None
Traceback (most recent call last):
File "C:\Python27\Scripts\easy_install-script.py", line 8, in <module>
load_entry_point('setuptools==0.6c11', 'console_scripts', 'easy_install')()
File "C:\Python27\lib\site-packages\setuptools\command\easy_install.py", line 1712, in main
with_ei_usage(lambda:
File "C:\Python27\lib\site-packages\setuptools\command\easy_install.py", line 1700, in with_ei_usage
return f()
File "C:\Python27\lib\site-packages\setuptools\command\easy_install.py", line 1716, in <lambda>
distclass=DistributionWithoutHelpCommands, **kw
File "C:\Python27\lib\distutils\core.py", line 152, in setup
dist.run_commands()
File "C:\Python27\lib\distutils\dist.py", line 953, in run_commands
self.run_command(cmd)
File "C:\Python27\lib\distutils\dist.py", line 972, in run_command
cmd_obj.run()
File "C:\Python27\lib\site-packages\setuptools\command\easy_install.py", line 211, in run
self.easy_install(spec, not self.no_deps)
File "C:\Python27\lib\site-packages\setuptools\command\easy_install.py", line 434, in easy_install
self.local_index
File "C:\Python27\lib\site-packages\setuptools\package_index.py", line 475, in fetch_distribution
return dist.clone(location=self.download(dist.location, tmpdir))
AttributeError: 'NoneType' object has no attribute 'clone'