iMac:nester ZEN$ python3 setup.py register
running register
running check
We need to know who you are, so please choose either:
 1. use your existing login,
 2. register as a new user,
 3. have the server generate a new password for you (and email it to you), or
 4. quit
Your selection [default 1]: 
1
Username: digwhy
Password: 
Registering nester to http://pypi.python.org/pypi
Server response (403): You are not allowed to store 'nester' package information
iMac:nester ZEN$

请问这是怎么回事呢？