运行可执行文件，该可执行文件从文件读取输入并打印到另一个文件

Question

I am trying to run a file, map.py, from within a Python program. My code is as follows:

import sh

exe = sh.Command("./path/to/map.py")
file_in = open("./path/to/inputfile") #inputfile has no extension
out_file = "./path/to/outputfile" #outputfile has no extension
exe(_in=file_in, _out=out_file)

After running this code, I get the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/vagrant/venv/lib/python3.5/site-packages/sh.py", line 1427, in __call__
    return RunningCommand(cmd, call_args, stdin, stdout, stderr)
  File "/vagrant/venv/lib/python3.5/site-packages/sh.py", line 774, in __init__
    self.wait()
  File "/vagrant/venv/lib/python3.5/site-packages/sh.py", line 792, in wait
    self.handle_command_exit_code(exit_code)
  File "/vagrant/venv/lib/python3.5/site-packages/sh.py", line 815, in handle_command_exit_code
    raise exc
sh.ErrorReturnCode_255:

  RAN: /vagrant/exec/word_count/map.py

  STDOUT:


  STDERR:

Here is a dummy example of what map.py would be doing:

print("hi")

There should be some stdout stuff though. The program just doesn't seem to be running for me and I'm not sure why. I've been staring at this for hours, I would really appreciate the help!

Answer 1

If you want to run that code in your current python shell, you should make the parent folder modules and import that file and access it directly.

If you want to run the file in a separate process and get the results use subprocess.check_output

Answer 2

If you want to read from one file and write it to another. You could do something like this

input_f = open(input, 'r')
output_f = open('workfile', 'w')
lines = input_f.readlines()
for i in lines:
    #replicates whatever map.py does
    output_f.write(new_line)
    output_f.flush()

I think that will work for what you are trying to do.