python --help
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options and arguments (and corresponding environment variables):
-b     : issue warnings about str(bytes_instance), str(bytearray_instance)
         and comparing bytes/bytearray with str. (-bb: issue errors)
-B     : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x
-c cmd : program passed in as string (terminates option list)
-d     : debug output from parser; also PYTHONDEBUG=x
-E     : ignore PYTHON* environment variables (such as PYTHONPATH)
-h     : print this help message and exit (also --help)
-i     : inspect interactively after running script; forces a prompt even
         if stdin does not appear to be a terminal; also PYTHONINSPECT=x
-I     : isolate Python from the user's environment (implies -E and -s)
-m mod : run library module as a script (terminates option list)
-O     : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x
-OO    : remove doc-strings in addition to the -O optimizations
-q     : don't print version and copyright messages on interactive startup
-s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE
-S     : don't imply 'import site' on initialization
-u     : unbuffered binary stdout and stderr, stdin always buffered;
         also PYTHONUNBUFFERED=x
         see man page for details on internal buffering relating to '-u'
-v     : verbose (trace import statements); also PYTHONVERBOSE=x
         can be supplied multiple times to increase verbosity
-V     : print the Python version number and exit (also --version)
-W arg : warning control; arg is action:message:category:module:lineno
         also PYTHONWARNINGS=arg
-x     : skip first line of source, allowing use of non-Unix forms of #!cmd
-X opt : set implementation-specific option
file   : program read from script file
-      : program read from stdin (default; interactive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]

Other environment variables:
PYTHONSTARTUP: file executed on interactive startup (no default)
PYTHONPATH   : ':'-separated list of directories prefixed to the
               default module search path.  The result is sys.path.
PYTHONHOME   : alternate <prefix> directory (or <prefix>:<exec_prefix>).
               The default module search path uses <prefix>/pythonX.X.
PYTHONCASEOK : ignore case in 'import' statements (Windows).
PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.
PYTHONFAULTHANDLER: dump the Python traceback on fatal errors.
PYTHONHASHSEED: if this variable is set to 'random', a random value is used
   to seed the hashes of str, bytes and datetime objects.  It can also be
   set to an integer in the range [0,4294967295] to get hash values with a
   predictable seed.
python --version
Python 3.4.2
 
ls -al 
total 196
drwxrwsr-x 11 tools.paws 52771  4096 May 16 05:42 .
drwxr-xr-x  3 root       root     17 May  1 09:23 ..
-rw-------  1 tools.paws 52771  2566 May 16 05:42 .bash_history
drwx--S---  3 tools.paws 52771  4096 Jan  9 14:08 .cache
drwxr-sr-x  2 tools.paws 52771  4096 May 16 05:40 .ipynb_checkpoints
drwxr-sr-x  5 tools.paws 52771  4096 Dec  3 19:39 .ipython
drwxr-sr-x  2 tools.paws 52771  4096 Dec  3 19:28 .jupyter
drwx------  2 tools.paws 52771  4096 Dec 11 06:00 .links2
drwx--S---  3 tools.paws 52771  4096 Dec  3 19:28 .local
drwx--S---  2 tools.paws 52771  4096 Dec  3 19:40 .pywikibot
-rw-------  1 tools.paws 52771   980 Dec  7 12:42 .viminfo
-rw-r--r--  1 tools.paws 52771  6410 Dec  3 19:41 Untitled.ipynb
-rw-r--r--  1 tools.paws 52771    72 Dec  7 04:20 Untitled1.ipynb
-rw-r--r--  1 tools.paws 52771  6875 Dec  7 12:40 Untitled2.ipynb
-rw-r--r--  1 tools.paws 52771  1522 Dec 14 22:00 Untitled3.ipynb
-rw-r--r--  1 tools.paws 52771   436 Feb 26 04:05 Untitled4.ipynb
-rw-r--r--  1 tools.paws 52771  3403 Feb 26 09:40 Untitled5.ipynb
-rw-r--r--  1 tools.paws 52771  1008 Feb 26 10:14 Untitled6.ipynb
-rw-r--r--  1 tools.paws 52771   952 Feb 27 04:18 Untitled7.ipynb
-rw-r--r--  1 tools.paws 52771  1120 May  2 01:11 Untitled8.ipynb
-rw-r--r--  1 tools.paws 52771  1145 May 16 05:42 Untitled9.ipynb
-rw-r--r--  1 tools.paws 52771   223 Dec  7 05:27 User_talk_John_Vandenberg
drwxr-sr-x  2 tools.paws 52771  4096 Dec  3 22:20 apicache
-rwxr-xr-x  1 tools.paws 52771 76146 Dec  7 12:52 checkimages.py
drwxr-sr-x  2 tools.paws 52771  4096 Dec  3 20:08 logs
-rw-r--r--  1 tools.paws 52771  9687 Apr 25 01:27 osm2wiki_dataset.py
-rw-r--r--  1 tools.paws 52771  1097 Dec  3 20:09 pywikibot.lwp
-rw-r--r--  1 tools.paws 52771     0 Dec  3 22:37 throttle.ctrl
-rwxr-xr-x  1 tools.paws 52771  3137 Dec  7 12:47 touch.py