Python 2.4.3 (#1, Apr  7 2006, 10:54:33) 
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.getcwd()
'/Users/jeanmarkgawron/python/scripting_comp_sci/src/py/exercises'
>>> dir = os.getcwd()
>>> os.listdir()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: listdir() takes exactly 1 argument (0 given)
>>> os.listdir(os.getcwd())
['averagerandom2.py', 'averagerandom2.py~', 'bar.txt', 'baz.txt', 'data', 'datatrans1_err.py', 'datatrans1_err.py~', 'ex2p1.py', 'ex2p10.py', 'ex2p10.py.sav', 'ex2p10.py~', 'ex2p4a.py', 'ex2p4b.py', 'ex2p4c.py', 'ex2p7.py', 'ex2p8.py', 'ex2p8.py~', 'ex2p9.py', 'ex2p9.py~', 'ex3p7.py', 'ex3p7.py~', 'find_grep.py', 'find_grep.pyc', 'find_grep.py~', 'find_programs.py', 'fixed_averagerandom2.py', 'fixed_datatrans1_err.py', 'foo.txt', 'foo.txt~', 'generate_some_data.py', 'monte_carlo_sim1.py', 'some_function_arguments.py', 'test.txt']
>>> os.listdir(os.getcwd())[0]
'averagerandom2.py'
>>> fname = os.listdir(os.getcwd())[0]
>>> full_path = os.path.join(dir,fname)
>>> full_path
'/Users/jeanmarkgawron/python/scripting_comp_sci/src/py/exercises/averagerandom2.py'
>>> os.path.split(full_path)
('/Users/jeanmarkgawron/python/scripting_comp_sci/src/py/exercises', 'averagerandom2.py')
>>> os.path.splitext(full_path)
('/Users/jeanmarkgawron/python/scripting_comp_sci/src/py/exercises/averagerandom2', '.py')
>>> os.environ['HOME']
'/Users/jeanmarkgawron'
>>> os.environ['PATH']
'/Library/Frameworks/Python.framework/Versions/Current/bin:/sw/bin:/sw/sbin:/usr/java:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/teTeX/bin/i386-apple-darwin-current:/Users/jeanmarkgawron/python/scripting_comp_sci/src/tools:/usr/X11R6/bin::/Users/jeanmarkgawron/bin:/Users/jeanmarkgawron/scripts:/usr/games:/usr/local/teTex/bin/i386-apple-darwin8.6.1/:/usr/lib/python2.3/idlelib:.:/usr/local/teTeX/bin/powerpc-apple-darwin-current'
>>> os.environ['PATH'].split(os.pathsep)
['/Library/Frameworks/Python.framework/Versions/Current/bin', '/sw/bin', '/sw/sbin', '/usr/java', '/bin', '/sbin', '/usr/bin', '/usr/sbin', '/usr/local/bin', '/usr/local/teTeX/bin/i386-apple-darwin-current', '/Users/jeanmarkgawron/python/scripting_comp_sci/src/tools', '/usr/X11R6/bin', '', '/Users/jeanmarkgawron/bin', '/Users/jeanmarkgawron/scripts', '/usr/games', '/usr/local/teTex/bin/i386-apple-darwin8.6.1/', '/usr/lib/python2.3/idlelib', '.', '/usr/local/teTeX/bin/powerpc-apple-darwin-current']
>>> os.pathsep
':'
>>> os.pardir
'..'
>>> pathdirs = os.environ['PATH'].split(os.pathsep)
>>> pathdirs[0]
'/Library/Frameworks/Python.framework/Versions/Current/bin'
>>> os.path.isfile(pathdirs[0])
False
>>> os.path.isdir(pathdirs[0])
True
>>> os.path.isfile(fname)
True
>>> origdir = os.getcwd()
>>> origdir
'/Users/jeanmarkgawron/python/scripting_comp_sci/src/py/exercises'
>>> os.chdir(pathdirs[0])
>>> os.getcwd()
'/Library/Frameworks/Python.framework/Versions/2.4/bin'
>>> os.chdir(origdir)
>>> os.getcwd()
'/Users/jeanmarkgawron/python/scripting_comp_sci/src/py/exercises'
>>> os.chdir(os.pardir)
>>> os.chdir(origdir)
>>> newdir = os.path.join(os.pardir,'newdir')
>>> newdir
'../newdir'
>>> if not os.path.isdir(newdir):
...    os.mkdir(newdir)
... 
>>> os.path.isdir(newdir)
True
>>> fname
'averagerandom2.py'
>>> import shutil
>>> shutil.copy(fname,newdir)
>>> os.listdir(newdir)
['averagerandom2.py']
>>> full_path2 = os.path.join(newdir,fname)
>>> full_path2
'../newdir/averagerandom2.py'
>>> os.remove(full_path2)
>>> os.listdir(newdir)
[]
>>> os.path.isdir(newdir)
True
>>> os.rmdir(newdir)
>>> os.path.isdir(newdir)
False
>>> ## working on region in file /tmp/python-192Zec.py...
Usage:  directory pattern (filepatterns)
>>> import re
>>> match = re.search('foo','xxffooy')
>>> match
<_sre.SRE_Match object at 0x6e288>
>>> match.span()
(3, 6)
>>> time_of_last_modification = os.path.getmtime(fname)
>>> time_of_last_modification
1166458404
>>> import time
>>> age_in_days = (time.time() -time_of_last_modification)/(60*60*24)
>>> age_in_days
2.4894646738193655
>>> fname
'averagerandom2.py'
>>> mod_tuple = time.localtime(time_of_last_modification)
>>> mod_tuple
(2006, 12, 18, 8, 13, 24, 0, 352, 0)
>>> mod_string = time.asctime(mod_tuple)
>>> mod_string
'Mon Dec 18 08:13:24 2006'