CODEWITHSUNDEEP
pythonclassconstructor
Thomas Sullivan
Thomas Sullivan

Reputation: 11

Passing a variable - Python

I am trying to figure out why I cannot pass a variable from a widget entry to a variable meant to be the username within a class of objects.

As written it throws the following error: TypeError: enter() missing 1 required positional argument: 'self'

class User:
    'a class to define users'
    def __init__(self, username, goal, contra, gender, weight):
        self.username = username
        self.goal = goal
        self.contra = contra
        self.gender = gender
        self.weight = weight

'Adds date and current weight to an array to track progress'
    #def weighIn[date, weight]:
    def setUser(self, username):
        self.username = string
def enter(self):
    global e1
    global string
    string = e1.get() 
    setUser()

namescreen = Tk.Tk()
namescreen.title("Current Exercise")

var = StringVar()
label = Label( namescreen, textvariable=var)
var.set("Hi! What is your name?")
label.pack()
usr = StringVar()
e1 = Entry(namescreen, textvariable=usr)
e1.pack()
b1 = tkinter.Button(namescreen, text ="Enter", command =enter)
b1.pack()


namescreen.bind('<Return>', enter)
namescreen.mainloop()

I have also tried adding newUser = User.init(self, "Default"...) and it tells me that self is not defined. I am not sure what I am doing wrong.

Upvotes: 0

Views: 69

Answers (1)

Alex F
Alex F

Reputation: 2274

First off, in your enter function you cant call setUser() without an instance of class User because it's a member function.

Second, you should include the enter function as a member function of class User. Then you need to create a User object and bind the button to User.event and not just event.

This code will run correctly though.

import Tkinter as Tk

class User:
    'a class to define users'
    def __init__(self, username, goal, contra, gender, weight):
        self.username = username
        self.goal = goal
        self.contra = contra
        self.gender = gender
        self.weight = weight

    'Adds date and current weight to an array to track progress'
    #def weighIn[date, weight]:
    def setUser(self, username):
        self.username = string
        print('Username is {}'.format(self.username))
    def enter(self):
        global e1
        global string
        string = e1.get() 
        self.setUser(string)

namescreen = Tk.Tk()
namescreen.title("Current Exercise")

user = User('','','','','')

var = Tk.StringVar()
label = Tk.Label( namescreen, textvariable=var)
var.set("Hi! What is your name?")
label.pack()
usr = Tk.StringVar()
e1 = Tk.Entry(namescreen, textvariable=usr)
e1.pack()
b1 = Tk.Button(namescreen, text ="Enter", command =user.enter)
b1.pack()


namescreen.bind('<Return>', user.enter)
namescreen.mainloop()

Upvotes: 1

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