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pythonsubprocesspopen

How to use '>>' in popen subprocess

I'm trying to run the command from a python file (2.7):

p=subprocess.Popen("sha256sum file1.zip >> file2.sha")

But i got an error that file '>>' does not exist. I tried:

p=subprocess.Popen("sha256sum file1.zip >> file2.sha".split())

But still the >> is a problem.

Of course that if I run the command in the prompt line it run Ok and put the output into the file file2.sha.

I know I can add stdout to the Popen but I was wonder if there is a way to run it as simple as runing from the command line.

Thanks.

Solution

  • You can pass values for the stdin and stdout of the child process to Popen like so:

    subprocess.Popen("sha256sum file1.zip", stdout = file("file2.sha", "a"))

    Note the file needs to be opened in append mode to achieve the same behaviour as >>.