In Python, command line args without import?

问题

In Python, is it possible to get the command line arguments without importing sys (or any other module)?

回答1:

Yes, if you're using Linux.

If you know the process ID, you can read its /proc/{pid}/cmdline file, which contains a null-separated list of the command line arguments:

PROCESS_ID = 14766
cmdline = open("/proc/" + str(pid) + "/cmdline").read()
print cmdline.split("\0")

But it's hard to know the process ID before you start the process. But there's a solution! Look at ALL of the processes!

PROGRAM_NAME = "python2\0stack.py"
MAX_PID = int(open("/proc/sys/kernel/pid_max").read())    

for pid in xrange(MAX_PID):
    try:
        cmd = open("/proc/" + str(pid) + "/cmdline").read().strip("\0")
        if PROGRAM_NAME in cmd:
            print cmd.split("\0")
            break
    except IOError:
        continue

So if we run python2 stack.py arg1 arg2 arg3 at the shell, a list of the command line arguments will be printed. This assumes you only ever have one process running the script at a given time.

PS., MAX_PID is the maximum PID on your system. You can find it in /proc/sys/kernel/pid_max.

PPS. Never, ever, ever write code like this. This post was 49% joke.

回答2:

No. You must import sys to get sys.argv, which is where the arguments are located

回答3:

No. Command line arguments are available only in sys.argv which cannot be accessed without importing sys.
May I ask why do you not want to import sys?

回答4:

On Linux, this will give you an array identical to the one that sys.argv would return:

argv = open('/proc/self/cmdline').read().split('\0')

来源：https://stackoverflow.com/questions/27368283/in-python-command-line-args-without-import

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