Scientific Calculator

[Spacecowboy]

Hi,

Im new with coding and python and try to rebuild a scientific calculator.
I have the buttons and screen etc, but now i want to add commands to the buttons.
When i run the code and press one of the number buttons it wont show up in the window.
Every hint is welcome!

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from tkinter import * import math import parser import tkinter.messagebox     mainFr = Tk() mainFr.title("CalcPy v1.1") operator = "" mainFr.configure(background="gray8") mainFr.resizable(width=FALSE, height=FALSE) mainFr.geometry("440x500+0+0")     calc = Frame(mainFr) calc.grid()   class Rekenmachine():     def __init__(self):         self.total = 0         self.current = ""         self.input_value = True         self.check_sum = False         self.op = ""         self.results = False       def numberEnter(self, num):         self.reuslt = False         firstnum = txtDisplay.get()         secondnum = str(num)         if self.input_value:             self.current = secondnum             self.input_value = False         else:             if secondnum == '.':                 if secondnum in firstnum:                     return             self.current = firstnum + secondnum         self.display(self.current)         def display(self, value):         txtDisplay.delete(0, END)         txtDisplay.insert(0, value)     added_value = calc     #===============DISPLAY================================== txtDisplay = Entry(calc, font=("arial", 20, "bold"), bd=10, width=28, justify=RIGHT) txtDisplay.grid(row=0, column=0, columnspan=4, pady=1) txtDisplay.insert(0, "0")             #===============BUTTON BASIC=================================== numberpad = "789456123" i = 0 btn = [] for j in range(2, 5):     for k in range(3):         btn.append(Button(calc, width=6, height=2, font=("arial", 20, "bold"), bg="gray75", text=numberpad[i]))         btn[i].grid(row=j, column=k, pady=1)         #================LAST ADDED CODE ======================================================         btn[i] ["command"] = lambda x= numberpad[i]: added_value.numberEnter(x) #=======================================================================================               i += 1         btnClear = Button(calc, text=chr(67), width=6, height=2,font=("arial", 20, "bold"), bg="OrangeRed2").grid(row=1, column=0, pady=1) btnClall = Button(calc, text=chr(67) + chr(69), width=6, height=2,font=("arial", 20, "bold"), bg="OrangeRed3").grid(row=1, column=1, pady=1) btnRoot = Button(calc, text="√", width=6, height=2,font=("arial", 20, "bold"), bg="orange").grid(row=1, column=2, pady=1) btnAdd = Button(calc, text="+", width=6, height=2,font=("arial", 20, "bold"), bg="orange").grid(row=1, column=3, pady=1) btnMin = Button(calc, text="-", width=6, height=2,font=("arial", 20, "bold"), bg="orange").grid(row=2, column=3, pady=1) btnDef = Button(calc, text="/", width=6, height=2,font=("arial", 20, "bold"), bg="orange").grid(row=3, column=3, pady=1) btnX = Button(calc, text="x", width=6, height=2,font=("arial", 20, "bold"), bg="orange").grid(row=4, column=3, pady=1) btnZero = Button(calc, text=",", width=6, height=2,font=("arial", 20, "bold"), bg="orange").grid(row=5, column=0, pady=1) btnDot = Button(calc, text="0", width=6, height=2,font=("arial", 20, "bold"), bg="gray75").grid(row=5, column=1, pady=1) btnSpec = Button(calc, text=chr(177), width=6, height=2,font=("arial", 20, "bold"), bg="orange").grid(row=5, column=2, pady=1) btnEq = Button(calc, text="=", width=6, height=2,font=("arial", 20, "bold"), bg="orange").grid(row=5, column=3, pady=1)

[Clunk_Head]

You have made

1	class Rekenmachine()

but you haven't instantiated it anywhere. To use the functions of that class you must make an instance of that class.

[Spacecowboy]

@Clunk_Head can u give me the example so I can understand it better. Do I need to call the class: Rekenmachine?

[Clunk_Head]

@Clunk_Head can u give me the example so I can understand it better. Do I need to call the class: Rekenmachine?

Happy to, but can you post the directions to the assignment first? You may not need to use the class.

[Spacecowboy]

##UPDATE##

@ line 47 changed to : added_value = Rekenmachine

There is now an error

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btn[i] ["command"] = lambda x= numberpad[i]: added_value.numberEnter(x) TypeError: numberEnter() missing 1 required positional argument: 'num'

---

@Clunk_Head the assignment before was a simple calculator without class

[Clunk_Head]

##UPDATE##

@ line 47 changed to : added_value = Rekenmachine

There is now an error

1 2 3

btn[i] ["command"] = lambda x= numberpad[i]: added_value.numberEnter(x) TypeError: numberEnter() missing 1 required positional argument: 'num'

---

@Clunk_Head the assignment before was a simple calculator without class

try

1	btn[i] ["command"] = lambda: added_value.numberEnter(numberpad[i])

but if you don't need a class in the program then you can simplify your code quite a bit by removing it, turning the instance variables into global variables, and defining the functions independent of a class.