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What I do in the command line:
cat file1 file2 file3 > myfile What I want to do with python:
import subprocess, shlex my_cmd = 'cat file1 file2 file3 > myfile' args = shlex.split(my_cmd) subprocess.call(args) # spits the output in the window i call my python program 
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To capture the output of the subprocess. run method, use an additional argument named “capture_output=True”. You can individually access stdout and stderr values by using “output. stdout” and “output.
To start a new process, or in other words, a new subprocess in Python, you need to use the Popen function call. It is possible to pass two parameters in the function call. The first parameter is the program you want to start, and the second is the file argument.
The subprocess. popen() is one of the most useful methods which is used to create a process. This process can be used to run a command or execute binary. The process creation is also called as spawning a new process which is different from the current process.
In Python 3.5+ to redirect the output, just pass an open file handle for the stdout argument to subprocess.run:
# Use a list of args instead of a string input_files = ['file1', 'file2', 'file3'] my_cmd = ['cat'] + input_files with open('myfile', "w") as outfile: subprocess.run(my_cmd, stdout=outfile) As others have pointed out, the use of an external command like cat for this purpose is completely extraneous.
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