python中os.popen, os.system()区别

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:

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>>> 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:

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>>> 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