python中os.popen, os.system()区别

直接上个例子吧,注意结果,os.system的结果只是命令执行结果的返回值,执行成功为0:

>>> a=os.system('ls')
Applications             Movies                   python-oldboy
Applications (Parallels) Music                    python3.sublime-build
Desktop                  Pictures                 rpro.log
Documents                Public                   test.py
Downloads                PycharmProjects          test.pyc
GitHub_source            Python_Assignment
Library                  oradiag_shane
>>> a
0

可以看到,a为0

但用os.popen就可以读出执行的内容,popen返回的是file read的对象,对其进行读取使用read(),就可看到执行的输出:

>>> b=os.popen('ls')
>>> b.read()
'Applications\nApplications (Parallels)\nDesktop\nDocuments\nDownloads\nGitHub_source\nLibrary\nMovies\nMusic\nPictures\nPublic\nPycharmProjects\nPython_Assignment\noradiag_shane\npython-oldboy\npython3.sublime-build\nrpro.log\ntest.py\ntest.pyc\n'
>>> type(b)
<class 'os._wrap_close'>
>>>

可以看出,输出的结果比较特殊,带换行符\n