Popen [sys. Improve this answer. Or better yet, in Python 3. Popen "myscript. Additionally, this will search the PATH for "myscript.
Roman Starkov Roman Starkov Here's a situation in which the two are significantly different. Suppose "myscript. Ahh I see what you mean although the script I was trying to run was always going to be in the current directory — dbr.
Popen ['myscript. The python. Hm, it seems you can exclude the. Good point, although in the actual script that caused the error I used os. Of course the forward slash has been valid on Windows since prehistoric times and still is, so that's not a problem.
Stefan, that would be the shell complaining and not the underlying Windows API. Robbie Robbie 2 2 gold badges 7 7 silver badges 19 19 bronze badges. So controlling subprocesses on windows is not as simple as posix style. Peter Moore Peter Moore 1, 10 10 silver badges 21 21 bronze badges. This pipe allows the command to send its output to another command.
The output is an open file that can be accessed by other programs. Here the command parameter is what you'll be executing, and its output will be available via an open file. The argument mode defines whether or not this output file is readable 'r' or writable 'w'. Appending a 'b' to the mode will open the file in binary mode. Thus, for example "rb" will produce a readable binary file object. In order to retrieve the exit code of the command executed, you must use the close method of the file object.
The bufsize parameter tells popen how much data to buffer, and can assume one of the following values:. This method is available for Unix and Windows platforms, and has been deprecated since Python version 2. If you're currently using this method and want to switch to the Python 3 version, here is the equivalent subprocess version for Python The code above will ask the operating system to list all files in the current directory.
The output of our method, which is stored in p , is an open file, which is read and printed in the last line of the code. The of this code in the context of my current directory result is as follows:.
This method is very similar to the previous one. The main difference is what the method outputs. In this case it returns two file objects, one for the stdin and another file for the stdout.
The popen2 method is available for both the Unix and Windows platforms. However, it is found only in Python 2. Again, if you want to use the subprocess version instead shown in more detail below , use the following instead:. This code will produce the same results as shown in the first code output above. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful?
Please rate your experience Yes No. Any additional feedback? Project: kano-toolset Author: KanoComputing File: processes. Project: multibootusb Author: mbusb File: gen. Project: pywren-ibm-cloud Author: pywren File: utils. Project: jawfish Author: war-and-code File: pydoc. Project: jawfish Author: war-and-code File: subprocess. Execute the string 'cmd' in a shell with os.
A trailing newline is stripped from the output. The exit status for the command can be interpreted according to the rules for the C function wait.
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