start.py

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# -*- coding: cp936 -*-
from __future__ import division   #y要引用这个的 不然是除法会出错的，这个解决了除法自动为0的问题的，这个是向未来的Qt引用的用法
import sys
from PyQt4 import QtCore, QtGui
from random_str import Ui_Form


class StartQt4(QtGui.QMainWindow):
    def __init__(self, parent= None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_Form()
        self.ui.setupUi(self)

        QtCore.QObject.connect(self.ui.str_gnr,QtCore.SIGNAL("clicked()"),self.str_generate)
        QtCore.QObject.connect(self.ui.cmpr,QtCore.SIGNAL("clicked()"),self.str_compare)


    def str_generate(self):
        import random
        import string
        rd = random.randrange(1,40,2)
        txt = string.join(random.sample(
            [chr(i) for i in range(48,123)],rd)).replace(" ","")     #是把字符都串起来，并且将其中的空格都替换没了，就是这样的
        self.ui.random_str.setText(txt)
                                                              
    def str_compare(self):
        line = self.ui.lineEdit.text()
        txt = self.ui.random_str.text()        
        if len(txt)>= len(line):
            leng= len(line)
        else:
            leng=len(txt)
        cnt = 0   
        for n in range(leng):
            if line[n] == txt[n]:
                cnt = cnt +1                
        bi = cnt / len(txt)*100
        self.ui.cor_rate.setText("%f%%"%bi)

if __name__== "__main__":
    app = QtGui.QApplication(sys.argv)
    myapp = StartQt4()
    myapp.show()
    sys.exit(app.exec_())