PS1 в интерпретаторе python

$ python
Python 3.4.3 (default, Mar 25 2015, 17:13:50) 
[GCC 4.9.2 20150304 (prerelease)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> import os
>>> import time
>>> class TrueAdminCMD:
...   def __repr__(self):
...     cwd = os.getcwd()
...     t = time.asctime()
...     return "{cwd} {t} \\m/ \\m/ #".format(cwd=cwd, t=t)
... 
>>> sys.ps1 = TrueAdminCMD()
/home/myhome Fri Sep 18 12:57:27 2015 \m/ \m/ #

$ python
Python 2.7.9 (default, Mar  1 2015, 12:57:24) 
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from datetime import datetime
>>> class PS1(object):
...     def __str__(self):
...         return datetime.now().isoformat()
... 
>>> sys.ps1 = PS1()
2015-09-18T13:57:18.016821
2015-09-18T13:57:19.640484sys.ps1
<__main__.PS1 object at 0x7f844cc893d0>