[issue4629] getopt should not accept no_argument that ends with '='

[Wang Chun]

New submission from Wang Chun <yaohua2000 at gmail.com>:

Consider the following program tmp.py:

import sys, getopt
print(getopt.getopt(sys.argv[1:], '', ['help']))

The program accept "--help" without a value:

python helloworld.py --help

But if someone invoke the program like:

python helloworld.py --help=

Python should raise an error.

"--help=" is not considered as no_argument in libc's getopt implementation (tested on Mac OS X 
Leopard):

#include <getopt.h>

static struct option longopts[] = { 
        { "help", no_argument, NULL, "h" },
};

#include <getopt.h>

static struct option longopts[] = { 
        { "help", no_argument, NULL, 'h' },
};

int main(int argc, char **argv)
{
        while (getopt_long(argc, argv, "h", longopts, NULL) != -1);
        return 0;
}

macbook:~/tmp$ gcc -o tmp tmp.c
macbook:~/tmp$ ./tmp --help=
tmp: option `--help' doesn't allow an argument
macbook:~/tmp$

----------
components: Library (Lib)
messages: 77597
nosy: wangchun
severity: normal
status: open
title: getopt should not accept no_argument that ends with '='
type: behavior
versions: Python 2.1.1, Python 2.1.2, Python 2.2, Python 2.2.1, Python 2.2.2, Python 2.2.3, Python 2.3, Python 2.4, Python 2.5, Python 2.5.3, Python 2.6, Python 2.7, Python 3.0, Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4629>
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