traceback while using subprocess.call

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?