This will give you the latest information on your USPS package. Just give it the USPS tracking number of your package, and it will give you a status or summary if valid. Requires PyQt4 and requests to run.

tracpac.py

#!/usr/bin/env python

from PyQt4.QtCore import *
from PyQt4.QtGui import *
import requests, os, sys
from xml.etree import ElementTree

"""
This will give you the latest information on your USPS package. Just
give it the USPS tracking number of your package, and it will give you
a status or summary if valid. Requires PyQt4 and requests to run.
"""
class TracPac( QWidget ):
    def __init__( self ):
        super( TracPac, self ).__init__( )
        self.setWindowTitle( 'TRACPAC' )
        self.trackingNumberLine = QLineEdit( )
        self.summaryLine = QTextEdit( )
        self.summaryLine.setReadOnly( True )
        self.summaryArea = QTextEdit( )
        self.summaryArea.setReadOnly( True )
        self.setStyleSheet("""
        QWidget {
        font-size: 14pt;
        font-family: Consolas;
        }""")
        qf = QFont( )
        qf.setFamily( 'Consolas' )
        qf.setPointSize( 14 )
        qfm = QFontMetrics( qf )
        self.summaryLine.setFixedWidth( 35 * qfm.width( 'A' ) )
        self.summaryLine.setFixedHeight( 40 )
        #
        myLayout = QVBoxLayout( )
        self.setLayout( myLayout )
        #
        topWidget = QWidget( )
        topLayout = QGridLayout( )
        topWidget.setLayout( topLayout )
        topLayout.addWidget( QLabel( 'TRACKING NO:' ), 0, 0, 1, 1 )
        topLayout.addWidget( self.trackingNumberLine, 0, 1, 1, 2 )
        myLayout.addWidget( topWidget )
        #
        midWidget = QWidget( )
        midLayout = QGridLayout( )
        midWidget.setLayout( midLayout )
        midLayout.addWidget( QLabel( 'SUMMARY:' ), 0, 0, 1, 1 )
        midLayout.addWidget( self.summaryLine, 0, 1, 1, 2 )
        myLayout.addWidget( midWidget )
        #
        botWidget = QGroupBox( 'DESCRIPTION' )
        botLayout = QHBoxLayout( )
        botWidget.setLayout( botLayout )
        botLayout.addWidget( self.summaryArea )
        myLayout.addWidget( botWidget )
        #
        self.trackingNumberLine.returnPressed.connect( self.processTracking )
        quitAction = QAction( self )
        quitAction.setShortcuts( ['Ctrl+Q', 'Esc' ] )
        quitAction.triggered.connect( sys.exit )
        self.addAction( quitAction )
        printAction = QAction( self )
        printAction.setShortcut( 'Ctrl+P' )
        def printDialog( ):
            while( True ):
                fname = str( QFileDialog.getSaveFileName( self, 'Save Screenshot',
                                                          os.getcwd( ),
                                                          filter = '*.png' ) )
                if fname.lower().endswith('.png') or len( os.path.basename( fname ) ) == 0:
                    break
            if fname.lower( ).endswith( '.png' ):
                qpm = QPixmap.grabWidget( self )
                qpm.save( fname )
        printAction.triggered.connect( printDialog )
        self.addAction( printAction )
        #
        self.setFixedWidth( self.sizeHint( ).width( ) )
        self.setFixedHeight( 300 )
        self.show( )

    def processTracking( self ):
        self.summaryLine.setText( "" )
        self.summaryArea.setPlainText( "" )
        trackNo = str( self.trackingNumberLine.text( ) ).strip( )
        if len(trackNo) == 0:
            return
        mainURL = 'http://production.shippingapis.com/ShippingAPI.dll'
        xmlDoc = """
        <TrackRequest USERID="426PERSO4722">
        <TrackID ID="%s"></TrackID>
        </TrackRequest>""" % ''.join( trackNo.split() )
        xmlDoc = ''.join( xmlDoc.split('\n'))
        xmlDoc = ''.join( xmlDoc.split('\t'))
        params = { 'API' : 'TrackV2', 'XML' : xmlDoc }
        response = requests.get( mainURL, params = params )
        if response.status_code != 200:
            return
        tree = ElementTree.fromstring( response.content )
        if len(list(tree.iter('TrackDetail'))) != 0:
            elem = min( tree.iter('TrackDetail') )
            self.summaryLine.setText( elem.text.strip( ) )
        elem = min( tree.iter( 'TrackSummary' ) )
        self.summaryArea.setPlainText( elem.text.strip( ) )

if __name__=='__main__':
    app = QApplication([])
    tp = TracPac( )
    result = app.exec_( )