Python - cmd command execution

Operating cmd python

We can usually use the os module command execution cmd

 

Method One: os.system

os.system(执行的命令)
# 源码
def system(*args, **kwargs): # real signature unknown
    """ Execute the command in a subshell. """
    pass

 

Method two: os.popen (command execution)

os.popen (command execution)

# 源码
def popen(cmd, mode="r", buffering=-1):
    if not isinstance(cmd, str):
        raise TypeError("invalid cmd type (%s, expected string)" % type(cmd))
    if mode not in ("r", "w"):
        raise ValueError("invalid mode %r" % mode)
    if buffering == 0 or buffering is None:
        raise ValueError("popen() does not support unbuffered streams")
    import subprocess, io
    if mode == "r":
        proc = subprocess.Popen(cmd,
                                shell=True,
                                stdout=subprocess.PIPE,
                                bufsize=buffering)
        return _wrap_close(io.TextIOWrapper(proc.stdout), proc)
    else:
        proc = subprocess.Popen(cmd,
                                shell=True,
                                stdin=subprocess.PIPE,
                                bufsize=buffering)
        return _wrap_close(io.TextIOWrapper(proc.stdin), proc)

 

Difference between the two

• Only the content of the system can return back to the input, wherein the code 0 indicating success. But we have no way to get information content output
• popen can acquire the content output information , it is an object, by  () .read  to read