>>>python27
>>>import sys
>>>sys.path
['', '/usr/local/python27/lib/python27.zip', '/usr/local/python27/lib/python2.7', '/usr/local/python27/lib/python2.7/plat-linux2', '/usr/local/python27/lib/python2.7/lib-tk', '/usr/local/python27/lib/python2.7/lib-old', '/usr/local/python27/lib/python2.7/lib-dynload', '/usr/local/python27/lib/python2.7/site-packages']

 1 #cat tab.py2 #!/usr/bin/env python3 # python startup file4 import sys5 import readline6 import rlcompleter7 import atexit8 import os9 # tab completion
10 readline.parse_and_bind('tab: complete')
11 # history file
12 histfile = os.path.join(os.environ['HOME'], '.pythonhistory')
13 try:
14     readline.read_history_file(histfile)
15 except IOError:
16     pass
17
18 atexit.register(readline.write_history_file, histfile)
19 del os, histfile, readline, rlcompleter

#echo "export PYTHONTAB=/usr/local/python27/lib/python2.7/tab.py" >>/etc/profile
#source /etc/profile

[root@web01 python2.7]# python27
Python 2.7.10 (default, Jan 12 2016, 16:23:29)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-16)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import tab
>>> import sys
>>> sys.
sys.__class__(              sys.argv                    sys.hexversion
sys.__delattr__(            sys.builtin_module_names    sys.long_info
sys.__dict__                sys.byteorder               sys.maxint
sys.__displayhook__(        sys.call_tracing(           sys.maxsize
sys.__doc__                 sys.callstats(              sys.maxunicode
sys.__excepthook__(         sys.copyright               sys.meta_path
sys.__format__(             sys.displayhook(            sys.modules
sys.__getattribute__(       sys.dont_write_bytecode     sys.path
sys.__hash__(               sys.exc_clear(              sys.path_hooks
sys.__init__(               sys.exc_info(               sys.path_importer_cache
sys.__name__                sys.exc_type                sys.platform
sys.__new__(                sys.excepthook(             sys.prefix
sys.__package__             sys.exec_prefix             sys.ps1
sys.__reduce__(             sys.executable              sys.ps2
sys.__reduce_ex__(          sys.exit(                   sys.py3kwarning
sys.__repr__(               sys.exitfunc(               sys.setcheckinterval(
sys.__setattr__(            sys.flags                   sys.setdlopenflags(
sys.__sizeof__(             sys.float_info              sys.setprofile(
sys.__stderr__              sys.float_repr_style        sys.setrecursionlimit(
sys.__stdin__               sys.getcheckinterval(       sys.settrace(
sys.__stdout__              sys.getdefaultencoding(     sys.stderr
sys.__str__(                sys.getdlopenflags(         sys.stdin
sys.__subclasshook__(       sys.getfilesystemencoding(  sys.stdout
sys._clear_type_cache(      sys.getprofile(             sys.subversion
sys._current_frames(        sys.getrecursionlimit(      sys.version
sys._getframe(              sys.getrefcount(            sys.version_info
sys._mercurial              sys.getsizeof(              sys.warnoptions
sys.api_version             sys.gettrace(
>>> sys.