Tuesday, May 31, 2022

Upgrade 04: PyQt6 Desktop App Template

The desktop app template has been upgraded to include a tool to update code of the mdi window without exiting entirely from the application. 

Procedure:

Close the main window, update the code from the IDE window and press the "Recompile" button. The main window will be reloaded with the new changes.

The output:



The code:

Can be downloaded from this github repository: https://github.com/bclme/python_desktop_app_template



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Sunday, May 29, 2022

PyQt6 Dynamic Programming

This demo program shows how to update a python file and reload it to update the running program without restarting the whole python app.

The output:


The code:

inputs.py:

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A = 1.6
B = 7.5
C = 1.5

main.py:



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import inputs
import importlib
import sys
import os
from PyQt6.QtWidgets import QApplication,  QWidget, QPushButton, QLabel

class Window(QWidget):

    def __init__(self):
        super(Window, self).__init__()

        self.initUI()

    def initUI(self):
        D = inputs.A + inputs.B + inputs.C
        self.lbl1 =  QLabel(('Inputs:  A:  ' + str(inputs.A) + '  B: ' + str(inputs.B) + '  C: ' + str(inputs.C)), self)
        self.lbl1.setGeometry(25, 25, 150, 35)
        
        self.lbl2 =  QLabel('Sum: '+ str(D), self)
        self.lbl2.setGeometry(25, 50, 150, 35)
        
        pb1 = QPushButton('Update', self)
        pb1.setGeometry(25, 100, 120, 30)
        
        pb1.clicked.connect(self.onClick_pb1)
        
        pb2 = QPushButton('Recompile', self)
        pb2.setGeometry(150, 100, 120, 30)        
        pb2.clicked.connect(self.onClick_pb2)
        
        

        self.setGeometry(25, 45, 350, 150)
        self.setWindowTitle('Post 37')
        self.show()
        
 
    def onClick_pb2(self):
 
       importlib.reload(inputs)
       
    def onClick_pb1(self):
 
       D = inputs.A + inputs.B + inputs.C
       self.lbl2.setText('Sum: '+ str(D))
       self.lbl1.setText('Inputs:  A:  ' + str(inputs.A) + '  B: ' + str(inputs.B) + '  C: ' + str(inputs.C))
        



    
def onClick_pb1():
    exit()

def main():

    app = QApplication(sys.argv)
    ex = Window()
    sys.exit(app.exec())


if __name__ == '__main__':
    main()

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Upgrade 03: PyQt6 Desktop App Template

The Desktop App Template has been upgraded to include global variables(for example: username must be stored in a global variable upon successful login), the global variable(username) is displayed permanently at right-most corner of the status bar, I did some minor code refactoring of the main window by adding a separate function for configuring the right sidebar and lastly, I made the side menu bar(treeview) database driven which means the treeview items are stored in a mysql table.

The output is the same as the original screen(from Upgrade 02) with the exception of the username getting displayed permanently at the status bar.


The mysql table definition:

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CREATE TABLE `tbsidebar` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `parent` varchar(25) NOT NULL,
 `node1` int(11) NOT NULL,
 `name` varchar(25) NOT NULL,
 `node_name` varchar(25) NOT NULL,
 PRIMARY KEY (`id`)
 ) ENGINE=MyISAM AUTO_INCREMENT=16 DEFAULT CHARSET=latin1

The code:

Can be downloaded from this github repository: https://github.com/bclme/python_desktop_app_template

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Monday, May 23, 2022

Create a 3-Layer Back Propagation Neural Network with Sigmoid, SGD and Relu Activation Function

 The demo program shows how to create a 3-layer back propagation neural network with sigmoid, stocastic gradient descent(sgd) and rectified linear unit(relu) activation function. The dataset used is the same as in this post (Predictive Model: Customer Subsciption(Continue/Discontinue) with Tensorflow). The dataset can be downloaded from kaggle. I used 50 records from the dataset.

The program is derived from this article.

The result in the original post using tensorflow is 79% accuracy while this program's result is 86%.

Read more »
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Saturday, May 14, 2022

Tensorflow: Save and Load Model to retrain

 This demo program show how to save a trained model and then load it for retraining. I splitted the original file into 2 which I used in this post "Predictive Model: Customer Subsciption (Continue/Discontinue) with Tensorflow". 


The output:

Orignal Model Accuracy result:


Loaded Model Accuracy result:


The code:

First program:


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import os
import pandas as pd
from sklearn.model_selection import train_test_split
from tensorflow.keras.models import Sequential, load_model
from tensorflow.keras.layers import Dense, Flatten
from sklearn.metrics import accuracy_score
from sklearn.metrics import ConfusionMatrixDisplay, classification_report, confusion_matrix
from matplotlib import style
import tensorflow as tf
from tensorflow import keras


style.use('classic')
df = pd.read_csv('cont_subs.csv')
X = pd.get_dummies(df.drop(['cont_subs', 'Customer ID'], axis=1))
y = df['cont_subs'].apply(lambda x: 1 if x=='Yes' else 0)
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=.15)
X.columns

y_train.head()

model = Sequential()
model.add(Dense(units=64, activation='relu', input_dim=len(X_train.columns)))
model.add(Dense(units=128, activation='relu'))
model.add(Dense(units=128, activation='relu'))
model.add(Dense(units=1, activation='sigmoid'))

checkpoint_path = "training_1/cp.ckpt"
checkpoint_dir = os.path.dirname(checkpoint_path)

# Create a callback that saves the model's weights
cp_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_path,
                                                 save_weights_only=True,
                                                 verbose=1)

model.compile(loss='binary_crossentropy', optimizer='sgd', metrics='accuracy')

model.fit(X_train, y_train, epochs=256, batch_size=32, callbacks=[cp_callback])

y_hat = model.predict(X_test)
y_hat = [0 if val < 0.5 else 1 for val in y_hat]

print('Model Accuracy' + str(accuracy_score(y_test, y_hat)))

# Display the model's architecture
model.summary()

cm = confusion_matrix(y_test, y_hat)
disp = ConfusionMatrixDisplay(confusion_matrix = cm)
disp.plot()

model.save('my_model')

 

The Loaded Model Program:

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import os
import pandas as pd
from sklearn.model_selection import train_test_split
from tensorflow.keras.models import Sequential, load_model
from tensorflow.keras.layers import Dense, Flatten
from sklearn.metrics import accuracy_score
from sklearn.metrics import ConfusionMatrixDisplay, classification_report, confusion_matrix
from matplotlib import style
import tensorflow as tf
from tensorflow import keras


style.use('classic')
df = pd.read_csv('cont_subs1.csv')
X = pd.get_dummies(df.drop(['cont_subs', 'Customer ID'], axis=1))
y = df['cont_subs'].apply(lambda x: 1 if x=='Yes' else 0)
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=.15)
X.columns
y_train.head()

new_model = tf.keras.models.load_model('my_model')

# Check its architecture
new_model.summary()
new_model = Sequential()
new_model.add(Dense(units=64, activation='relu', input_dim=len(X_train.columns)))
new_model.add(Dense(units=128, activation='relu'))
new_model.add(Dense(units=1, activation='sigmoid'))

checkpoint_path = "training_1/cp.ckpt"
checkpoint_dir = os.path.dirname(checkpoint_path)

# Create a callback that saves the model's weights
cp_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_path,
                                                 save_weights_only=True,
                                                 verbose=1)

new_model.compile(loss='binary_crossentropy', optimizer='sgd', metrics='accuracy')
new_model.fit(X_train, y_train, epochs=256, batch_size=32, callbacks=[cp_callback])
new_model.evaluate(X_train, y_train, verbose=2)
y_hat = new_model.predict(X_test)
y_hat = [0 if val < 0.5 else 1 for val in y_hat]

#accuracy_score(y_test, y_hat)
print('Loaded Model Accuracy' + str(accuracy_score(y_test, y_hat))) 


model.save('my_model')

new_model.summary()

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Thursday, May 12, 2022

Create a Rich Text Document with Image and Printpreview using QTextEdit in PyQt6

This demo program shows how to create a rich text document with an image and print preview the contents.

The Output:




The code:

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from PyQt6.QtWidgets import QWidget, QPushButton, QApplication, QTextEdit
from PyQt6.QtCore import Qt
from PyQt6 import QtPrintSupport

import sys
class Example(QWidget):

    def __init__(self):
        super().__init__()

        self.initUI()


    def initUI(self):
    
        self.etext = QTextEdit(self)  
        self.etext.setReadOnly(True)        
        self.etext.setGeometry(25, 40, 300, 300)
        redText = "<span style=\" font-size:8pt; font-weight:600; color:#ff0000;\" >"
        redText = redText  + "I want this text red"
        redText = redText  + "</span>"
        self.etext.append(redText)

        blackText = "<p><span style=' font-size:12pt;'>CENTER</span></p>"      
        self.etext.append(blackText)
        self.etext.setAlignment(Qt.AlignmentFlag.AlignCenter)
        
        img = "<p><img src='balloon.png' style='width:50px;height:60px;' ></p>"
        self.etext.append(img)
        self.etext.setAlignment(Qt.AlignmentFlag.AlignRight)
        
        self.redb = QPushButton('Preview', self)       
        self.redb.setGeometry(250, 370, 80, 40)
        self.redb.clicked.connect(self.handlePreview)
        self.setGeometry(200, 100, 350, 430)
        self.setWindowTitle('Post 33')
        self.show()
        
    def handlePreview(self):
        dialog = QtPrintSupport.QPrintPreviewDialog()
        dialog.paintRequested.connect(self.etext.print)
        dialog.exec()  
def main():
    
    app = QApplication(sys.argv)
    ex = Example()
    
    sys.exit(app.exec())
   

if __name__ == '__main__':
    main()

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Wednesday, May 11, 2022

Upgrade 02: PyQt6 Desktop App Template

This demo program add another improvement of the desk top app template(original post here). The newly added feature is a the ability to login, a simple password encryption(sha256) and connecting to sa mysql database. Also added a top layer file that should perform system configuration before the splash screen is shown.

 

Login Info:

  UserName : admin

  Password :  Appl3Tr33.456

The output:

 


The mysql table:

 

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CREATE TABLE `tbusr` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `username` varchar(256) NOT NULL,
 `userpassword` varchar(2048) NOT NULL,
 PRIMARY KEY (`id`),
 UNIQUE KEY `ind_usr` (`username`)
 ) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=latin1

 

The code:

The python code to encrypt the password:

 

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import os
import hashlib
import hmac
password = "Appl3Tr33.456"
password = password.encode()
#salt = os.urandom(16)
password_hash = hashlib.pbkdf2_hmac("sha256", password, salt, 100000)

salt = b'4\xa8y\x8e\xca\xfb\x7f\x8e\xd5\x97v\x14\xc7[Z\xd0'
print(salt)
print(password_hash)

popular_app.py:

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from imports import *
from splash import SplashScreen
class App(a.QWidget):
    def __init__(self, parent=None):
        super().__init__()
        self.setWindowTitle("")
        self.do_logging()
        self.setFixedSize(0, 0)
        self.hide()
        t.sleep(1)
        self.splash1 = SplashScreen()
        self.splash1.show() 
    def do_logging(self):
        print("Do something here...")
 
        
def main():

    app = a.QApplication(s.argv)
    app.setStyleSheet('''
        #title_label {
            font-size: 50px;
            color: #F0B21A;
        }
        #desc_label {
            font-size: 15px;
            color: #F0B21A;
        }
        #loading_label {
            font-size: 20px;
            color: #F0B21A;
        }
        QFrame {
            background-color: #2F339B;
            color: #c8c8c8;
        }
    ''')
    ex = App()
    s.exit(app.exec())


if __name__ == '__main__':
    main()


login.py:


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from imports import *
import mysql.connector as mysql
import hashlib
import hmac
import pandas as pd
from mainw import Window2

TIME_LIMIT = 100
class WindowApp(a.QMainWindow):
    def __init__(self, parent=None):
        super().__init__()
        self.setWindowTitle("Login")
        self.setFixedSize(320, 245)
        self.quit = g.QAction("Quit", self)
        self.quit.triggered.connect(self.closeEvent)
        self.move(400, 200) 
        lblusr =  a.QLabel('UserName', self)
        lblusr.setStyleSheet('QLabel {background-color: transparent; color: black;}')
        lblusr.setGeometry(25, 55, 100, 30) 
        self.txtusr = a.QLineEdit('', self) 
        
        self.txtusr.setGeometry(100, 55, 150, 30)  
        lblpwd =  a.QLabel('Password', self)
        lblpwd.setStyleSheet('QLabel {background-color: transparent; color: black;}')
        lblpwd.setGeometry(25, 100, 100, 30) 
        self.txtpwd = a.QLineEdit('', self) 
        self.txtusr.setPlaceholderText("Enter Username Here")
        self.txtpwd.setPlaceholderText("Enter Password Here")
        self.txtpwd.setGeometry(100, 100, 150, 30) 
        self.txtpwd.setEchoMode(a.QLineEdit.EchoMode.Password)        
        self.pblogin = a.QPushButton('Login', self)
        self.pblogin.setEnabled(False)
        self.pblogin.setGeometry(100, 165, 65, 25)
        self.pblogin.clicked.connect(self.onClick_pb3)  
        self.txtpwd.textChanged.connect(self.on_text_changed)
        self.txtusr.textChanged.connect(self.on_text_changed)
        pbcanc = a.QPushButton('Cancel', self)
        pbcanc.setGeometry(180, 165, 65, 25)
        pbcanc.clicked.connect(self.onClick_pb4)  
        self.statusBar = a.QStatusBar()
        self.setStatusBar(self.statusBar)
        self.statusBar.showMessage("Ready", 5000)        
        #self.show()
        
        self.progressBar = a.QProgressBar()
        self.progressBar.setStyleSheet("""QProgressBar {
            background-color: transparent;
            color: #9B2F6A;
            border-style: none;
            border-radius: 5px;
            text-align: center;
            font-size: 10px;
        }
        QProgressBar::chunk {
            border-radius: 5px;
            background-color: qlineargradient(spread:pad x1:0, x2:1, y1:0.511364, y2:0.523, stop:0 #E1F01A);
        }""")
        self.statusBar.addPermanentWidget(self.progressBar)
        self.progressBar.move(30, 40)
        self.progressBar.setFixedSize(120, 20)
        #self.progressBar.setValue(100)
    def on_text_changed(self):
        self.pblogin.setEnabled(bool(self.txtusr.text()) and bool(self.txtpwd.text()))
        
    def closeEvent(self, event):
        close = a.QMessageBox()
        close.setIcon(a.QMessageBox.Icon.Question)
        close.setWindowTitle('Pls confirm')
        close.setStyleSheet('QLabel {background-color: transparent; color: black;}')
        close.setText("Do you really want to quit?")
        close.setStandardButtons(a.QMessageBox.StandardButton.Yes | a.QMessageBox.StandardButton.Cancel)
        close = close.exec()

        if close == a.QMessageBox.StandardButton.Yes:
            event.accept()
        else:
            event.ignore()
    def onClick_pb3(self):
        db = mysql.connect(
             host = "localhost",
             user = "root",
             passwd = "",
             database = "pop_app"
        )
        cursor = db.cursor()
        t1 = self.txtusr.text()
        t2 = self.txtpwd.text()
        salt = b'4\xa8y\x8e\xca\xfb\x7f\x8e\xd5\x97v\x14\xc7[Z\xd0'
        print(t2)
        t2 = hashlib.pbkdf2_hmac("sha256", t2.encode(), salt, 100000)
        
        t1 = repr(str(t1))
        t2 = repr(str(t2))
        print(t2)
        query = "SELECT * FROM tbusr where username = %s and userpassword  = %s" %(t1, t2)
        cursor.execute(query)
        records = cursor.fetchall()
        df = pd.DataFrame(records) 
        count = 0
        while count < TIME_LIMIT:
            count += 1
            t.sleep(0.01)
            self.progressBar.setValue(count)
        if df.empty:    
            self.statusBar.showMessage("User not found!", 5000)
            self.txtusr.setStyleSheet('QLineEdit {background-color: #ffe6e6; color: black;}')
            self.txtusr.repaint()
            t.sleep(1.5)  
            self.txtusr.setStyleSheet('QLineEdit {background-color: white; color: black;}')
            self.txtusr.repaint()
        else:
            self.statusBar.showMessage("User found!", 5000)
            self.statusBar.repaint()
            t.sleep(2)
            self.showWindow2()
            
            self.hide()
            
        #self.w = Window2()       
        #self.w.show()
        
    def showWindow2(self):
        self.mdiwindow = Window2()
        self.mdiwindow.show()
    def onClick_pb4(self):
        self.quit 
        self.close()    
          
if __name__ == "__main__":       
    app = a.QApplication(s.argv)
    app.setStyleSheet('''        
        QProgressBar {
            background-color: #000000;
            color: #9B2F6A;
            border-style: none;
            border-radius: 4px;
            text-align: center;
            font-size: 10px;
        }
        QProgressBar::chunk {
            border-radius: 4px;
            background-color: qlineargradient(spread:pad x1:0, x2:1, y1:0.511364, y2:0.523, stop:0 #E1F01A);
        }
    ''')
    splash = WindowApp()
    splash.show()
    s.exit(app.exec())

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Monday, May 2, 2022

Global Variables Handling across PyQt6 Windows

This demo program shows how to handle global variables across files or PyQt6 windows and execute a function from another file.


The output:




The code:

config.py:

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a = 0
b = "empty"

update.py:

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import config

config.a = 10
config.b = "alphabet"

def update(arg1, arg2):
    config.a = arg1
    config.b = arg2
    
def add(arg1, arg2):
    return arg1 + arg2

main.py:

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from imports import *
from main1 import WindowApp1
import config
import update



class WindowApp(a.QMainWindow):
    def __init__(self, parent=None):
        super().__init__()
        self.setWindowTitle("Post 31")
        self.setFixedSize(320, 245)
        
        lbla =  a.QLabel('Global a: ', self)        
        lbla.setGeometry(25, 55, 100, 30) 
        
        self.txta = a.QLineEdit(str(config.a), self)        
        self.txta.setGeometry(100, 55, 50, 30) 
        
        self.lbla_r =  a.QLabel(str(config.a), self)        
        self.lbla_r.setGeometry(170, 55, 50, 30)
        
        lblb =  a.QLabel('Global b: ', self)        
        lblb.setGeometry(25, 100, 100, 30) 
        
        self.txtb = a.QLineEdit(config.b, self) 
        self.txtb.setGeometry(100, 100, 50, 30) 
        
        self.lblb_r =  a.QLabel(config.b, self)        
        self.lblb_r.setGeometry(170, 100, 50, 30) 
        
        self.pblogin = a.QPushButton('Login', self)
        self.pblogin.setGeometry(50, 195, 65, 25)
        self.pblogin.clicked.connect(self.onClick_pb3)
        
        pbcanc = a.QPushButton('Update', self)
        pbcanc.setGeometry(125, 195, 65, 25)
        pbcanc.clicked.connect(self.onClick_pb4)
        
        pbcalc = a.QPushButton('Function', self)
        pbcalc.setGeometry(200, 195, 65, 25)
        pbcalc.clicked.connect(self.onClick_pb5)
        
        lblf =  a.QLabel('Function: ', self)        
        lblf.setGeometry(25, 140, 75, 30) 
        
        self.txtfa = a.QLineEdit(self) 
        self.txtfa.setGeometry(100, 140, 40, 30)
        
        lblfp =  a.QLabel('+', self)        
        lblfp.setGeometry(150, 140, 10, 30) 
        
        self.txtfb = a.QLineEdit(self) 
        self.txtfb.setGeometry(165, 140, 40, 30)
        
        self.lblf_r =  a.QLabel( self)        
        self.lblf_r.setGeometry(215, 140, 40, 30)
        
    def onClick_pb3(self):
        self.mdiwindow = WindowApp1()
        self.mdiwindow.show()
        self.hide()
    def onClick_pb4(self): 
          
        a = int(self.txta.text())
        b = self.txtb.text()

        update.update(a,b)
        
        self.lbla_r.setText(str(config.a))
        self.lblb_r.setText(config.b)
 
    def onClick_pb5(self):
        self.lblf_r.setText('= ' + str(update.add(int(self.txtfa.text()),int(self.txtfb.text())))) 

if __name__ == "__main__":       
    app = a.QApplication(s.argv)
 
    splash = WindowApp()
    splash.show()
    s.exit(app.exec())

main1.py:

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from imports import *
import config




class WindowApp1(a.QMainWindow):
    def __init__(self, parent=None):
        super().__init__()
        self.setWindowTitle("Post 31")
        self.setFixedSize(320, 245)
        self.lbla =  a.QLabel('Global a: ', self)        
        self.lbla.setGeometry(25, 55, 100, 30) 
        
        self.lblb =  a.QLabel('Global b: ', self)        
        self.lblb.setGeometry(25, 100, 100, 30)
        
        self.pblogin = a.QPushButton('End', self)
        self.pblogin.setGeometry(100, 165, 65, 25)
        self.pblogin.clicked.connect(self.onClick_pb3)
        pbcanc = a.QPushButton('Print', self)
        pbcanc.setGeometry(180, 165, 65, 25)
        pbcanc.clicked.connect(self.onClick_pb4)
        
        
    def onClick_pb3(self):       
        self.close()
        
    def onClick_pb4(self): 
     
        self.lbla.setText('Global a: ' + str(config.a))
        self.lblb.setText('Global b: ' + config.b)
if __name__ == "__main__":       
    app = a.QApplication(s.argv)
 
    splash = WindowApp1()
    splash.show()
    s.exit(app.exec())

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