shell - How to execute '<(cat fileA fileB)' using python? -

I'm writing a Python program that uses other software I use the subprocess.popen By the order was able to pass. I am facing a new problem: I need to include as many files as two files and use it as an input for external program. The command line looks like this:

extersoftware --fq --f & lt; (Cat fileA_1 fileB_1) & lt; (Cat fileA_2 fileB_2)

I can not use shell = true because other commands have to pass me in variables, such as - fq . (They are not limited to the F - this is just one example)

A possible solution is to create the middle file, this is what I have tried to do:

  File_1 = ['cat', 'fileA_1', 'fileB_1'] p1 = popan (file_1, standout = pipe) p2 = popan (['>  

error message me Found:

Code> OSError: [Aran 2] No such file or directory What part was I wrong?

It would be better if there is no middle file for this reason, I I'm looking at the designated pipe, I do not think it is silent.

I have seen many questions which have been answered, how are they all different from my question for me.Thanks for your help.

The way the handle handles <

1. Create a pipe
2. Write a command which writes at the end
3. and <..) / Dev / fd / n where N is the input end of the pipe file descriptor ( Try Unj to <(true) ).
4. Run the command

then the command will open / dev / fd / n , and the OS will cause a duplicate of that legacy Read the end of the pipe.

We can do the same thing in Python:

  Import subprocess import OS # Open a pipe and run a command that writes at the end of the input Input_fd, output_fd = Os.pipe () subprocess.Popen (["cat", "foo.txt", "bar.txt"], shell = false, stdout = output_fd) os.close (output_fd); # Run a command that reads end using proc = subprocess.Popen (["wc", "/ dev / fd /" + str (input_fd)), / dev / fd / * to shell, shell = False , Stdout = subprocess .ppe) # Print out the command of that command proc.communicate () [0]  

For example:

  $ cat Foo.txt Hello $ cat bar .txt world $ wc & lt; (Cat foo.txt bar.txt) 2 2 12 / dev / fd / 63 $ python test.py 2 12 / dev / fd / 4