python核心编程十四章练习

14-3

fn = raw_input('$py:')execfile(fn)

14-4

import osfrom subprocess import callos.system('dir')call('dir', shell=True)

14-5

from commands import getoutput        output = getoutput('ls')  

14-6

from subprocess import Popen, PIPEfn = Popen('dir', stdout=PIPE, shell=True)for eachline in fn.stdout:    print eachline

14-8

import sysdef foo():    print 'exit .. . 'sys.exitfunc = fooprint '123'

14-9

import oswhile True:    cmd = raw_input("$:")    if cmd == 'exit':        break    f = os.popen(cmd)    for line in f:        print line,