TypeError：必须是不包含空字节的字符串，在os.system（）中不能为str

Question

I am trying to write a python code which executes a C executable using the following line

os.system("./a.out \"%s\"" % payload)

where ./a.out is a C executable, and payload is a string (without spaces) given as command line argument. (The link is this . I am trying to follow example under section chaining functions)
Now I have written another C code but it takes 3 command line arguments. So my string should be arg[1] + " " + arg[2] + " " + payloadString. (The c code is converting the arg[1] and arg[2] into integer to use it in its functions). Here is the snippet of my python code:

p = "10 "  #arg[1]
p += "10 " #arg[2]
p += "string without spaces which I need as payload" #arg[3]
os.system("./a.out \"%s\"" % p)

where ./a.out is executable of my C code which takes 3 command line arguments. When I run the python code I get error:

Traceback (most recent call last):
File "this_file.py", line XX, in <module>
os.system("./a.out \"%s\"" % p)
TypeError: must be string without null bytes, not str

Can anyone help me?
PS I am new to python. Similar questions were there in stack overflow, but I am not sure how to use their answers to solve my problem.

Answer 1

在os.system调用中放入r 。

os.system(r"./a.out \"%s\"" % p)

Answer 2

Why don't you use call for this purpose. I guess it will do the work You can provide the arguments in the list Example:

from subprocess import call
call(["./a.out","10","10","string without spaces which I need as payload"])

here in your case it is equivalent to

call(["./a.out",arg[0],arg[1],arg[2]])

I think this should work