在Ubuntu16.04中python环境下实现tab键补全

1.编写tab.py的代码：

 1 #!/usr/bin/env python
 2 # python startup file 
 3 import sys
 4 import readline
 5 import rlcompleter
 6 import atexit
 7 import os
 8 # tab completion 
 9 readline.parse_and_bind('tab: complete')
10 # history file 
11 histfile = os.path.join(os.environ['HOME'], '.pythonhistory')
12 try:
13     readline.read_history_file(histfile)
14 except IOError:
15     pass
16 atexit.register(readline.write_history_file, histfile)
17 del os, histfile, readline, rlcompleter

 2.把上面的代码，保存成tab.py文件，然后保存到下面的指定路径之一：

>>> import sys
>>> sys.path
['', '/home/hhl/dev/catkin_ws/devel/lib/python2.7/dist-packages', '/home/hhl/catkin_ws/devel/lib/python2.7/dist-packages', '/opt/ros/kinetic/lib/python2.7/dist-packages', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PILcompat', '/usr/lib/python2.7/dist-packages/gtk-2.0']

3.使用：导入tab模块，可以使用tab键补全功能，例如：

>>> import tab
>>> import sys
>>> sys.
sys.__class__(              sys.exit(
sys.__delattr__(            sys.exitfunc(
sys.__dict__                sys.flags
sys.__displayhook__(        sys.float_info
sys.__doc__                 sys.float_repr_style
sys.__excepthook__(         sys.getcheckinterval(
sys.__format__(             sys.getdefaultencoding(
sys.__getattribute__(       sys.getdlopenflags(
sys.__hash__(               sys.getfilesystemencoding(
sys.__init__(               sys.getprofile(
sys.__name__                sys.getrecursionlimit(
sys.__new__(                sys.getrefcount(
sys.__package__             sys.getsizeof(
sys.__reduce__(             sys.gettrace(
sys.__reduce_ex__(          sys.hexversion
sys.__repr__(               sys.long_info
sys.__setattr__(            sys.maxint
sys.__sizeof__(             sys.maxsize
sys.__stderr__              sys.maxunicode
sys.__stdin__               sys.meta_path
sys.__stdout__              sys.modules
sys.__str__(                sys.path
sys.__subclasshook__(       sys.path_hooks
sys._clear_type_cache(      sys.path_importer_cache
sys._current_frames(        sys.platform
sys._getframe(              sys.prefix
sys._mercurial              sys.ps1
sys._multiarch              sys.ps2
sys.api_version             sys.py3kwarning
sys.argv                    sys.pydebug
sys.builtin_module_names    sys.setcheckinterval(
sys.byteorder               sys.setdlopenflags(
sys.call_tracing(           sys.setprofile(
sys.callstats(              sys.setrecursionlimit(
sys.copyright               sys.settrace(
sys.displayhook(            sys.stderr
sys.dont_write_bytecode     sys.stdin
sys.exc_clear(              sys.stdout
sys.exc_info(               sys.subversion
sys.exc_type                sys.version
sys.excepthook(             sys.version_info
sys.exec_prefix             sys.warnoptions
sys.executable              
>>> sys.