Print lines/words/chars stats of files by extension，charsstats,'''PYTHON SO

Print lines/words/chars stats of files by extension，charsstats,'''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'''Show file statistics by extension.'''import osimport sysclass Stats:    def __init__(self):        self.stats = {}    def statargs(self, args):        for arg in args:            if os.path.isdir(arg):                self.statdir(arg)            elif os.path.isfile(arg):                self.statfile(arg)            else:                sys.stderr.write('Can't find %s\n' % file)                self.addstats('<???>', 'unknown', 1)    def statdir(self, dir):        self.addstats('<dir>', 'dirs', 1)        try:            names = os.listdir(dir)        except os.error, err:            sys.stderr.write('Can't list %s: %s\n' % (file, err))            self.addstats(ext, 'unlistable', 1)            return        names.sort()        for name in names:            if name.startswith('.#'):                continue # Skip CVS temp files            if name.endswith('~'):                continue# Skip Emacs backup files            full = os.path.join(dir, name)            if os.path.islink(full):                self.addstats('<lnk>', 'links', 1)            elif os.path.isdir(full):                self.statdir(full)            else:                self.statfile(full)    def statfile(self, file):        head, ext = os.path.splitext(file)        head, base = os.path.split(file)        if ext == base:            ext = '' # E.g. .cvsignore is deemed not to have an extension        ext = os.path.normcase(ext)        if not ext:            ext = '<none>'        self.addstats(ext, 'files', 1)        try:            f = open(file, 'rb')        except IOError, err:            sys.stderr.write('Can't open %s: %s\n' % (file, err))            self.addstats(ext, 'unopenable', 1)            return        data = f.read()        f.close()        self.addstats(ext, 'bytes', len(data))        if '\0' in data:            self.addstats(ext, 'binary', 1)            return        if not data:            self.addstats(ext, 'empty', 1)        #self.addstats(ext, 'chars', len(data))        lines = data.splitlines()        self.addstats(ext, 'lines', len(lines))        del lines        words = data.split()        self.addstats(ext, 'words', len(words))    def addstats(self, ext, key, n):        d = self.stats.setdefault(ext, {})        d[key] = d.get(key, 0) + n    def report(self):        exts = self.stats.keys()        exts.sort()        # Get the column keys        columns = {}        for ext in exts:            columns.update(self.stats[ext])        cols = columns.keys()        cols.sort()        colwidth = {}        colwidth['ext'] = max([len(ext) for ext in exts])        minwidth = 6        self.stats['TOTAL'] = {}        for col in cols:            total = 0            cw = max(minwidth, len(col))            for ext in exts:                value = self.stats[ext].get(col)                if value is None:                    w = 0                else:                    w = len('%d' % value)                    total += value                cw = max(cw, w)            cw = max(cw, len(str(total)))            colwidth[col] = cw            self.stats['TOTAL'][col] = total        exts.append('TOTAL')        for ext in exts:            self.stats[ext]['ext'] = ext        cols.insert(0, 'ext')        def printheader():            for col in cols:                print '%*s' % (colwidth[col], col),            print        printheader()        for ext in exts:            for col in cols:                value = self.stats[ext].get(col, '')                print '%*s' % (colwidth[col], value),            print        printheader() # Another header at the bottomdef main():    args = sys.argv[1:]    if not args:        args = [os.curdir]    s = Stats()    s.statargs(args)    s.report()if __name__ == '__main__':    main()