一个小巧的Python Shell

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#!/usr/bin/python
# -*- coding: cp936 -*-

#################################
#   Written by caocao           #
#   caocao@eastday.com          #
#   http://nethermit.yeah.net   #
#################################

import os
import sys
import string
import re

print "Written by caocao"
print "caocao@eastday.com"
print "http://nethermit.yeah.net"
print

if os.name=="nt":
print "OS: Windows NT"
else:
print "OS: Unknown"
print "Python Shell Version 1.0"
print
while True:
try:
command=string.strip(raw_input("PS "+os.getcwd()+">"), " ")
commandLow=string.lower(command)
except EOFError:
break
else:
if commandLow=="exit" or commandLow=="quit":
break
elif commandLow=="":
continue
elif re.match("^[a-z]{1}:$", command, re.I)!=None:
try:
os.chdir(command)
except OSError:
print "No such file or directory"
elif re.match("^cd (.+)$", command, re.I)!=None:
matchObject=re.search("^cd (.+)$", command, re.I)
if matchObject!=None:
try:
os.chdir(matchObject.group(1))
except OSError:
print "No such file or directory"
else:
print "Bad command"
else:
os.system(command)
print
print "Byebye!"