A grep-like tool that looks for division operators.，grep-likeoperators,'''PYTHON SO

A grep-like tool that looks for division operators.，grep-likeoperators,'''PYTHON SO

'''PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2--------------------------------------------1. This LICENSE AGREEMENT is between the Python Software Foundation('PSF'), and the Individual or Organization ('Licensee') accessing andotherwise using this software ('Python') in source or binary form andits associated documentation.2. Subject to the terms and conditions of this License Agreement, PSFhereby grants Licensee a nonexclusive, royalty-free, world-widelicense to reproduce, analyze, test, perform and/or display publicly,prepare derivative works, distribute, and otherwise use Pythonalone or in any derivative version, provided, however, that PSF'sLicense Agreement and PSF's notice of copyright, i.e., 'Copyright (c)2001, 2002, 2003, 2004 Python Software Foundation; All Rights Reserved'are retained in Python alone or in any derivative version preparedby Licensee.3. In the event Licensee prepares a derivative work that is based onor incorporates Python or any part thereof, and wants to makethe derivative work available to others as provided herein, thenLicensee hereby agrees to include in any such work a brief summary ofthe changes made to Python.4. PSF is making Python available to Licensee on an 'AS IS'basis.  PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS ORIMPLIED.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO ANDDISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESSFOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOTINFRINGE ANY THIRD PARTY RIGHTS.5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHONFOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS ASA RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON,OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.6. This License Agreement will automatically terminate upon a materialbreach of its terms and conditions.7. Nothing in this License Agreement shall be deemed to create anyrelationship of agency, partnership, or joint venture between PSF andLicensee.  This License Agreement does not grant permission to use PSFtrademarks or trade name in a trademark sense to endorse or promoteproducts or services of Licensee, or any third party.8. By copying, installing or otherwise using Python, Licenseeagrees to be bound by the terms and conditions of this LicenseAgreement.'''#! /usr/bin/env python'''finddiv - a grep-like tool that looks for division operators.Usage: finddiv [-l] file_or_directory ...For directory arguments, all files in the directory whose name ends in.py are processed, and subdirectories are processed recursively.This actually tokenizes the files to avoid false hits in comments orstrings literals.By default, this prints all lines containing a / or /= operator, ingrep -n style.  With the -l option specified, it prints the filenameof files that contain at least one / or /= operator.'''import osimport sysimport getoptimport tokenizedef main():    try:        opts, args = getopt.getopt(sys.argv[1:], 'lh')    except getopt.error, msg:        usage(msg)        return 2    if not args:        usage('at least one file argument is required')        return 2    listnames = 0    for o, a in opts:        if o == '-h':            print __doc__            return        if o == '-l':            listnames = 1    exit = None    for filename in args:        x = process(filename, listnames)        exit = exit or x    return exitdef usage(msg):    sys.stderr.write('%s: %s\n' % (sys.argv[0], msg))    sys.stderr.write('Usage: %s [-l] file ...\n' % sys.argv[0])    sys.stderr.write('Try '%s -h' for more information.\n' % sys.argv[0])def process(filename, listnames):    if os.path.isdir(filename):        return processdir(filename, listnames)    try:        fp = open(filename)    except IOError, msg:        sys.stderr.write('Can't open: %s\n' % msg)        return 1    g = tokenize.generate_tokens(fp.readline)    lastrow = None    for type, token, (row, col), end, line in g:        if token in ('/', '/='):            if listnames:                print filename                break            if row != lastrow:                lastrow = row                print '%s:%d:%s' % (filename, row, line),    fp.close()def processdir(dir, listnames):    try:        names = os.listdir(dir)    except os.error, msg:        sys.stderr.write('Can't list directory: %s\n' % dir)        return 1    files = []    for name in names:        fn = os.path.join(dir, name)        if os.path.normcase(fn).endswith('.py') or os.path.isdir(fn):            files.append(fn)    files.sort(lambda a, b: cmp(os.path.normcase(a), os.path.normcase(b)))    exit = None    for fn in files:        x = process(fn, listnames)        exit = exit or x    return exitif __name__ == '__main__':    sys.exit(main())