Function not working as intended, python, TKinter

Question

Im having trouble calling an variable from a function within another function.

I have two functions:

def refineRate(event):

    if refineRate(event) == int():
        refine = int(refineRate(event))
        return refine

    else:
        refine = float(refineRate(event))
        return refine

and:

def veldCalc(event):

    minValue = open("mineral_value.csv", "r")
    veld = minValue.readlines()[0]
    minValue.close()
    veld = veld[0:3]
    veld = int(veld)
    veld = veld / 100 * refineRate(event)
    refinedVeld = veld * int(veldCalc)
    print (refinedVeld)

I also have two entry where the user of the calculator can enter some figures.

repro = Label(root, text="Reprocessing %")
repro_entry = Entry(root)
repro.grid(row=0, column=0)
repro_entry.grid(row=0, column=1)


veld = Label(root, text="Veldspar: ")
veld_entry = Entry(root)
veld.grid(row=1, column=0)
veld_entry.grid(row=1, column=1)

repro_entry.bind("<KeyPress>", refineRate)
veld_entry.bind("<KeyPress>", veldCalc)

What i need is for the user to input there refineRate and which should then get passed through the function and stored for later use. the when they enter the amount they have, the veldCalc function should then pull the users refine rate from the previous function and do the math but im getting the following errors

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Ganjena\AppData\Local\Programs\Python\Python36-32\lib\tkinter\__init__.py", line 1699, in __call__
    return self.func(*args)
  File "C:/Users/Ganjena/Desktop/Course/Projects/helloworld/ORE FUNCTIONS/Ore Calculator.py", line 5, in refineRate
    if refineRate(event) == int():
  File "C:/Users/Ganjena/Desktop/Course/Projects/helloworld/ORE FUNCTIONS/Ore Calculator.py", line 5, in refineRate
    if refineRate(event) == int():
  File "C:/Users/Ganjena/Desktop/Course/Projects/helloworld/ORE FUNCTIONS/Ore Calculator.py", line 5, in refineRate
    if refineRate(event) == int():
  [Previous line repeated 990 more times]
RecursionError: maximum recursion depth exceede

any idea to why this isn't working? Thank you in advance.

The recursion in your first function will never stop, you always have a recursive call in your if condition... — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Apr 9, 2017 at 20:08
ok i think i understand, and how could i stop this? but its not a loop so why does it continue to run itself? — Gromit
– Gromit, Commented Apr 9, 2017 at 20:10
Because it's a recursive function that always calls itself, like try def f(): f() You never reach your else block because each time you call the function, it checks the if condition, and calls itself again... endlessly (well, until Python errors you out). And indeed, you always end up using a recursive call... so I don't know what you expect to happen or what your function is usppose to do. — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Apr 9, 2017 at 20:11
all i want it to do is take the user input check if its a int or a float and then store it to be used in the veldCalc funtion — Gromit
– Gromit, Commented Apr 9, 2017 at 20:15
The rest of your code is very strange as well. For example, in your second function, what do you expect veld * int(veldCalc) to do? veldCalc is the function itself! — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Apr 9, 2017 at 20:18

Community · Accepted Answer · 2017-05-23 12:10:22Z

0

You seem to have a misconception of how to get the user-input value inside a tk.Entry widget. The proper way is to use the .get() method on the widget.

Here is a minimal example to get you started:

# (Use Tkinter/tkinter depending on Python version)
import Tkinter as tk 

class App(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.repro = tk.Label(self, text="Reprocessing %")
        self.repro_entry = tk.Entry(self)
        self.repro.grid(row=0, column=0)
        self.repro_entry.grid(row=0, column=1)
        self.repro_entry.bind("<Return>", self.refineRate)
        self.mainloop()

    def refineRate(self, evt):
        # Get the user input and print it in the terminal
        userRepro = self.repro_entry.get()
        print(userRepro)

# Launch the GUI
app = App()

Then, to check whether the user input is a float or an int, you can use the technique described in this link.

edited May 23, 2017 at 12:10

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answered Apr 10, 2017 at 16:55

Josselin

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