MongoDB logical operators explained @BroCodez

Uploaded July 2024 | Updated September 2026, 1 week ago

#MongoDB #course #tutorial

db.students.find({$and: [{fullTime:true}, {age:{$lte:22}}]})
db.students.find({$or: [{fullTime:true}, {age:{$lte:22}}]})
db.students.find({$nor: [{fullTime:true}, {age:{$lte:22}}]})
db.students.find({age:{$not:{$gte:30}}})

$Code a stopwatch using Python! ⏱ #python #pythontutorial #pythoncourse 00:00:00 intro 00:00:16 pip install PyQt5 00:00:37 imports 00:01:56 class Stopwatch(QWidget) 00:02:28 if name 00:03:54 START HERE 00:05:57 method declarations 00:06:55 initUI() 00:09:40 setStyleSheet() 00:12:28 signals and slots 00:13:33 methods definitions # Python PyQt5 Stopwatch import sys from PyQt5.QtWidgets import (QApplication, QWidget, QLabel, QPushButton, QVBoxLayout, QHBoxLayout) from PyQt5.QtCore import QTimer, QTime, Qt class Stopwatch(QWidget): def init (self): super(). init () self.time = QTime(0, 0, 0, 0) self.time_label = QLabel(00:00:00.00, self) self.start_button = QPushButton(Start, self) self.stop_button = QPushButton(Stop, self) self.reset_button = QPushButton(Reset, self) self.timer = QTimer(self) self.initUI() def initUI(self): self.setWindowTitle(Stopwatch) vbox = QVBoxLayout() vbox.addWidget(self.time_label) self.setLayout(vbox) self.time_label.setAlignment(Qt.AlignCenter) hbox = QHBoxLayout() hbox.addWidget(self.start_button) hbox.addWidget(self.stop_button) hbox.addWidget(self.reset_button) vbox.addLayout(hbox) self.setStyleSheet( QPushButton, QLabel{ padding: 20px; font-weight: bold; font-family: calibri; } QPushButton{ font-size: 50px; } QLabel{ font-size: 120px; background-color: hsl(200, 100%, 85%); border-radius: 20px; } ) self.start_button.clicked.connect(self.start) self.stop_button.clicked.connect(self.stop) self.reset_button.clicked.connect(self.reset) self.timer.timeout.connect(self.update_display) def start(self): self.timer.start(10) def stop(self): self.timer.stop() def reset(self): self.timer.stop() self.time = QTime(0, 0, 0, 0) self.time_label.setText(self.format_time(self.time)) def format_time(self, time): hours = time.hour() minutes = time.minute() seconds = time.second() milliseconds = time.msec() // 10 return f{hours:02}:{minutes:02}:{seconds:02}.{milliseconds:02} def update_display(self): self.time = self.time.addMSecs(10) self.time_label.setText(self.format_time(self.time)) if name main : app = QApplication(sys.argv) stopwatch = Stopwatch() stopwatch.show() sys.exit(app.exec_())$

Python PyQt5 setup a basic GUI Application! 🖥️

Create Python checkboxes in 5 minutes! ✅

Learn runtime polymorphism in 5 minutes! 🤷‍♂️

$Add CSS to Python in 10 minutes! 🎨 #pythontutorial #python #pythonprogramming 00:00:00 intro 00:00:21 imports 00:00:47 buttons setup 00:01:35 layout manager 00:03:10 apply CSS to a class 00:06:12 apply CSS to an id 00:08:17 advanced colors 00:09:56 pseudo-classes # PyQt5 setStyleSheet() import sys from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, QWidget, QHBoxLayout class MainWindow(QMainWindow): def init (self): super(). init () self.button1 = QPushButton(#1) self.button2 = QPushButton(#2) self.button3 = QPushButton(#3) self.initUI() def initUI(self): central_widget = QWidget() self.setCentralWidget(central_widget) hbox = QHBoxLayout() hbox.addWidget(self.button1) hbox.addWidget(self.button2) hbox.addWidget(self.button3) central_widget.setLayout(hbox) self.button1.setObjectName(button1) self.button2.setObjectName(button2) self.button3.setObjectName(button3) self.setStyleSheet( QPushButton{ font-size: 40px; font-family: Arial; padding: 15px 75px; margin: 25px; border: 3px solid; border-radius: 15px; } QPushButton#button1{ background-color: hsl(0, 100%, 64%); } QPushButton#button2{ background-color: hsl(122, 100%, 64%); } QPushButton#button3{ background-color: hsl(204, 100%, 64%); } QPushButton#button1:hover{ background-color: hsl(0, 100%, 84%); } QPushButton#button2:hover{ background-color: hsl(122, 100%, 84%); } QPushButton#button3:hover{ background-color: hsl(204, 100%, 84%); } ) if name main : app = QApplication(sys.argv) window = MainWindow() window.show() sys.exit(app.exec_())$

Lets code a BANK PROGRAM with C programming! 💵