一个小巧的Python Shell

#!/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!"