Bill Jefferson <shagge...@yahoo.com> added the comment: Eric..... Thanks for answering, but I don't understand the difference between "reversing a list" and "reversing it's current values". If I have a list containing elements: A, B, C, D and reverse the list's current values, I get: D, C, B, A, which is the same as reversing the list. Please explain in more detail. Perhaps you can recommend good reference material. Since sort() sorts a list ascending (and works correctly), shouldn't reverse() sort the list descending? Am I using the wrong function? I have attached my program: Bill.....
#EX38.PY Get listing of all files in a directory #http://stackoverflow.com/questions/237079/how-to-get-file-creation-modification-date-times-in-python # Answer 37 import os, datetime topDir = "C:/BrcmCDs" dateFirst = True # put dates before file names # DateFirst = False # put file names before dates def modDate(fileN): # returns a 10-place date string t = os.path.getmtime(directory+"/"+fileN) return str(datetime.datetime.fromtimestamp(t))[0:10] for directory, dirnames, filenames in os.walk(topDir): outList = [] print "Directory: ", directory print for fileA in filenames: if (fileA[0:10] == "B57IBMCD_T" and fileA[-4:] == ".zip"): dateString = modDate(fileA) if dateFirst: fileString = dateString + " " + fileA else: fileString = fileA + " " + dateString outList.append(fileString) outList.sort() # sort the file list, ascending # outList.reverse() # reverse the file list, desending print outList #show all files # now save list to a file: # https://bbs.archlinux.org/viewtopic.php?id=75839 f = open("fileList.TXT", "w") f.write("\n".join(map(lambda x: str(x), outList))) f.close() Regards from: William Jefferson Photography 514 Daniels St., #211 Raleigh, NC 27605 Cell Phone: (919) 931-6681 EMail: shagge...@yahoo.com Brides & Weddings: http://www.WilliamJeffersonPhotography.com Special Events: http://www.DancingLight.org ________________________________ From: Eric V. Smith <rep...@bugs.python.org> To: shagge...@yahoo.com Sent: Tuesday, April 10, 2012 5:45 PM Subject: [issue14542] reverse() doesn't reverse sort correctly Eric V. Smith <e...@trueblade.com> added the comment: list.reverse() does not reverse a list, it reverses its current values. Help on built-in function reverse: reverse(...) L.reverse() -- reverse *IN PLACE* >>> ---------- nosy: +eric.smith resolution: -> invalid stage: -> committed/rejected status: open -> closed _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue14542> _______________________________________ ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue14542> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
