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/usr/share/doc/python-apt/examples/progress.py is in python-apt-doc 0.8.3ubuntu7.

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#!/usr/bin/python

import sys
import time

import apt


class TextProgress(apt.OpProgress):

    def __init__(self):
        self.last=0.0

    def update(self, percent):
        if (self.last + 1.0) <= percent:
            sys.stdout.write("\rProgress: %i.2          " % (percent))
            self.last = percent
        if percent >= 100:
            self.last = 0.0

    def done(self):
        self.last = 0.0
        print "\rDone                      "


class TextFetchProgress(apt.FetchProgress):

    def __init__(self):
        pass

    def start(self):
        pass

    def stop(self):
        pass

    def updateStatus(self, uri, descr, shortDescr, status):
        print "UpdateStatus: '%s' '%s' '%s' '%i' " % (
            uri, descr, shortDescr, status)

    def update_status_full(self, uri, descr, shortDescr, status, fileSize, 
                           partialSize):
        print "update_status_full: '%s' '%s' '%s' '%i' '%d/%d'" % (
            uri, descr, shortDescr, status, partialSize, fileSize)

    def pulse(self):
        print "Pulse: CPS: %s/s; Bytes: %s/%s; Item: %s/%s" % (
            apt.SizeToStr(self.currentCPS), apt.SizeToStr(self.currentBytes),
            apt.SizeToStr(self.totalBytes), self.currentItems, self.totalItems)
        return True

    def pulse_items(self, items):
        print "Pulse: CPS: %s/s; Bytes: %s/%s; Item: %s/%s" % (
            apt.SizeToStr(self.currentCPS), apt.SizeToStr(self.currentBytes),
            apt.SizeToStr(self.totalBytes), self.currentItems, self.totalItems)
        print "Pulse-Items: "
        for itm in items:
            uri, descr, shortDescr, fileSize, partialSize = itm
            print " - '%s' '%s' '%s' '%d/%d'" % (
                uri, descr, shortDescr, partialSize, fileSize)
        return True

    def mediaChange(self, medium, drive):
        print "Please insert medium %s in drive %s" % (medium, drive)
        sys.stdin.readline()
        #return False


class TextInstallProgress(apt.InstallProgress):

    def __init__(self):
        apt.InstallProgress.__init__(self)
        pass

    def startUpdate(self):
        print "StartUpdate"

    def finishUpdate(self):
        print "FinishUpdate"

    def statusChange(self, pkg, percent, status):
        print "[%s] %s: %s" % (percent, pkg, status)

    def updateInterface(self):
        apt.InstallProgress.updateInterface(self)
        # usefull to e.g. redraw a GUI
        time.sleep(0.1)


class TextCdromProgress(apt.CdromProgress):

    def __init__(self):
        pass

    # update is called regularly so that the gui can be redrawn

    def update(self, text, step):
        # check if we actually have some text to display
        if text != "":
            print "Update: %s %s" % (text.strip(), step)

    def askCdromName(self):
        print "Please enter cd-name: ",
        cd_name = sys.stdin.readline()
        return (True, cd_name.strip())

    def changeCdrom(self):
        print "Please insert cdrom and press <ENTER>"
        answer = sys.stdin.readline()
        return True


if __name__ == "__main__":
    c = apt.Cache()
    pkg = c["3dchess"]
    if pkg.isInstalled:
        pkg.markDelete()
    else:
        pkg.markInstall()

    res = c.commit(TextFetchProgress(), TextInstallProgress())

    print res