Scientific Calculator

[Clunk_Head]

##UPDATE##

@ line 47 changed to : added_value = Rekenmachine

There is now an error

   
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

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.