Python Object Oriented Programming (OOP) - For Beginners

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Recommends carlosdafield · 2021-11 · Stack Overflow · on “Don't understand cause of this TypeError”

You have two issues here. 1) A class is meant to create as an object, so do obj.calc_bmi(weight,height) 2) self.wieght and self.height need to be set by the values passed in Here's a working solution class bmi: def __init__(self): self.weight = 0 self.height = 0 def calc_bmi(self,weight,height): self.weight = weight self.height = height if self.height<=0: print("!!!DIVISON BY ZERO ERROR!!!") return None self.bm = self.weight /self.height * self.height return self.bm def main(): obj = bmi() weight = float(input("Enter weight")) height = float(input("Enter height")) result = obj.calc_bmi(weight,height) print(f"Your bmi is {result}") main() Watch this video and you will understand everything (

Recommends carlosdafield · 2021-12 · Stack Overflow · on “How do I rewrite this code to fetch the details from a table from postgres DB in OOP format?”

Heres an example of the same code but with a class. class ConnectDB: # Special method that runs when initialized def __init__(self): self.db = self.connect() def connect(self): return psycopg2.connect(host='localhost', database='Country Details', user='postgres', password='root') def _tuplesToStrings(self,rows): return [rows[row][0] for row in range(len(rows))] def getCountries(self): cur = self.db.cursor() cur.execute("SELECT country_name FROM country_details") rows = cur.fetchall() country_list = self._tuplesToStrings(rows) cur.close() return country_list # Special method that runs when the object falls out of scope. def __del__(self): self.db.close() And heres how you would use it. db = C

Recommends ori raisfeld · 2023-02 · Stack Overflow · on “My Simple combat system isn't working properly”

you only lower the health if health is above 0, so it's going to repeat forever for no reason def health_damage(): sum = int(d_health[0]) - damage if sum > 0: d_health.remove(d_health[0]) d_health.append(str(sum)) begin_game() if int(d_health[0]) <= 0: clear() print( "You defeated the dragon!" ) just remove the sum part and directly remove the if statment. it doesnt help with anything. you should instead do this: d_health = 100 damage = random.int(1, 7) def health_damage(): d_health -= damage # the -= is a better looking version of d_health = d_health - damage if int(d_health) <= 0: clear() print( "You defeated the dragon!" ) while True: if input(""): quit() else: clear() begin_game() (btw a

Recommends agustinvaca · 2023-04 · Stack Overflow · on “How do I get the return value from a function?”

As detailed in this answer [LINK] , you can either declare a global variable before on_click() , and set that variable inside on_click() using the global keyword before the name of the variable. It would be preferable however to create a class for your button, and create a member variable that you set inside an on_click() method and can later access with a getter method. If you need a refresher on OOP concepts, I would recommend this article [LINK] , or this video [this video] .

Recommends Advik · 2024-06 · Stack Overflow · on “How do I use tkraise on another frame class in Tkinter”

The Problem The error you're encountering is because the sign_in function is defined inside the widgets method, making it a nested function. In this context, it does not automatically get self as its first parameter. To fix this, you need to move the sign_in function to be a method of the login_page class instead of being inside widgets. Additionally, to raise the main frame after a successful login, you need to pass a reference to the main frame instance to the login_page instance. Here’s a corrected version of your code: from customtkinter import * global d_text d_text = '' class software(CTk): def __init__(self): super().__init__() self.geometry('1000x800') self.Main = main(self) self.Log

Cites Swerve · 2021-05 · Stack Overflow · on “get_grade() missing 1 required positional argument: 'self'”

I was trying to Imitate a video ( [this video] ) I'm facing the problem whenever I run the code I got an error for the 'self' argument * the first line should be with no indent but for StackOverflow I indeed the whole code with 4 taps. class Student: def __init__(self, name, age, grade): self.name = name self.age = age self.grade = grade # 0 - 100 def get_grade(self): return self.grade class Course: def __init__(self, name, max_students): self.name = name self.max_students = max_students self.students = [] def add_student(self, student): if len(self.students) < self.max_students: self.students.append(student) return True return False def get_average_grade(self): value = 0 for student in self.stud