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This article mainly shows you "how to use the popen function in python", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to use the popen function in python" this article.

Popen function

The basic call format is as follows:

Import os stream = os.popen ("some_command with args")

The popen function has the same function as the os.system function, except that the popen function provides an object for manipulating the file and can access the data in the file using standard input and output. There are three other variants of the popen function, which treat Imax O slightly differently. If you pass everything as a string, the command is passed to the Shell program; if you pass it as a list, you don't have to worry about escaping anything. For example:

Import os stream = os.popen ("cat command.py | grep-n subprocess") print (type (stream)) result = stream.readlines () print (type (result)) print (result)

If you execute this code, you will output the following:

['1:import subprocess\ n', '2:subprocess.run (["ls", "- l"])\ n', '5:subprocess.call (["ls", "- l"])\ n', '8:os.system ("cat command.py | grep-n subprocess > result.txt")\ n']

We can see that the readlines method returns the execution result of the command as a list.

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