当我尝试pypm install twisted pypm install morbid pypm install orbited时，我得到了
warning: no such package found for requirement "twisted"; try PyPM Index:
http://code.activestate.com/pypm/search:twisted/
warning: no such package found for requirement "morbid"; try PyPM Index:
http://code.activestate.com/pypm/search:morbid/
warning: no such package found for requirement "orbited"; try PyPM Index:
http://code.activestate.com/pypm/search:orbited/
有谁知道为什么这些包都不被识别？我做了一件明显不对的事吗？