Python Qt4 PortScanner

Qt4PortScanner.py

import sys
import PyQt4.QtGui as QtGui
import socket

'''
Qt4 Version Of Python PortScanner (https://gist.github.com/T31337/93cf239fff8314b182e2)

License:
 This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>
GUI PortScanner By: T31337

Please Note, This Porgram Claims To Be "Not Responding" During Scan,
However, If You Wait, It Should Complete And Start Responding Again!
'''

class PortScanner():
    def __init__(self):
        app = QtGui.QApplication(sys.argv)
        self.scanner()
        sys.exit(app.exec_())

    def pscan(self,port):
        try:
            target = self.server.text()
            s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
            s.connect((target,port))
            return True
        except:
            return False

    def scan(self):
        if self.server.text() == "":
            msg = QtGui.QMessageBox()
            msg.setWindowTitle("PortScanner")
            msg.setIcon(3)
            msg.setText("ERROR:\r\nPlease Enter A Server URL Or IP ADDRESS")
            msg.exec_()
            pass
        else:
            msg = QtGui.QMessageBox()
            msg.setWindowTitle("PortScanner")
            msg.setText("Please Wait For Scan To Complete\r\nWindow May Appear Frozen During Scan\r\nResults Will Appear In Window When Done.")
            msg.setIcon(2)
            msg.exec_()
            self.scanBtn.setEnabled(False)
            self.message.setText("Scan For "+self.server.text())
            print('Scanning',self.server.text())
            for x in range(self.port.value(),self.port2.value()+1):
                if self.pscan(x):
                    print('Port ',x,': Open!')
                    msg = "Port "+str(x)+" Is Open!"
                    self.message.append(msg)
                else:
                    print('port ',x,': Closed!')
                    msg = "Port "+str(x)+" Is Closed!"
                    self.message.append(msg)
            self.scanBtn.setEnabled(True)

    def scanner(self):
        win = QtGui.QDialog()
        self.server = QtGui.QLineEdit()
        self.port = QtGui.QSpinBox()
        self.port.setMaximum(49151)
        self.port.setMinimum(0)
        self.port2 = QtGui.QSpinBox()
        self.port2.setMaximum(49151)
        self.port2.setMinimum(0)
        self.message = QtGui.QTextEdit()
        self.message.setReadOnly(True)
        self.scanBtn = QtGui.QPushButton()
        self.scanBtn.setText("Scan!")
        self.scanBtn.clicked.connect(self.scan)
        layout = QtGui.QGridLayout()
        layout.setSpacing(10)
        layout.addWidget(QtGui.QLabel("Server:"), 0, 0, 1, 1)
        layout.addWidget(QtGui.QLabel("Starting Port:"), 2, 0, 1, 1)
        layout.addWidget(QtGui.QLabel("Ending Port:"), 4, 0, 1, 1)
        layout.addWidget(self.server, 0, 1, 2, 2)
        layout.addWidget(self.port, 2, 1, 2, 2)
        layout.addWidget(self.port2, 4, 1, 2, 2)
        layout.addWidget(self.message, 6, 0, 2, 3)
        layout.addWidget(self.scanBtn, 8, 0, 2, 3)
        win.setWindowTitle("PortScanner")
        win.setLayout(layout)
        win.setGeometry(100, 100, 250, 350)
        win.exec_()
        sys.exit()

if __name__ == '__main__':
    gui = PortScanner()