使用subprocess.call时进行回溯

Question

import sys
import subprocess
arg1= sys.argv[1]
subprocess.call("inversion_remover.py",arg1)
subprocess.call("test3.py")
subprocess.call("test4.py")

I am getting the following traceback

Traceback (most recent call last):
  File "parent.py", line 4, in <module>
    subprocess.call("inversion_remover.py",arg1)
  File "/usr/lib/python2.7/subprocess.py", line 522, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/usr/lib/python2.7/subprocess.py", line 659, in __init__
    raise TypeError("bufsize must be an integer")
TypeError: bufsize must be an integer

How do I solve the above traceback?

Answer 1

You need to pass in the command as a list :

subprocess.call(["inversion_remover.py", arg1])
subprocess.call(["test3.py"])
subprocess.call(["test4.py"])

otherwise your arg1 value is passed on to the underlying Popen() object as the bufsize argument.

Note that the scripts must be found on the path . If you want to execute these files from the local directory either prefix the path with ./ , or extend the PATH environment variable to include the current working directory:

subprocess.call(["./inversion_remover.py", arg1])
subprocess.call(["./test3.py"])
subprocess.call(["./test4.py"])

or

import os

env = os.environ.copy()
env['PATH'] = os.pathsep.join(['.', env['PATH']])

subprocess.call(["inversion_remover.py", arg1], env=env)
subprocess.call(["test3.py"], env=env)
subprocess.call(["test4.py"], env=env)