Tkinter widgets on incorrect Frame

Question

I'm trying to size entry boxes using pixels, so I am having to create a frame to get the correct size. I am also using a class to create tkinter Entry boxes so that I can put placeholders into the boxes. These both work separately; yet, when put together, the entry box refuses to go onto the correct frame even though I have specified the frame.

import Tkinter as tk
from Tkinter import *

class GUI:

    def __init__(self, root):
        self.usernameFrame = Frame(root, height=50, width=300, bg="GREEN", bd=3)
        self.usernameFrame.pack_propagate(0)
        self.usernameFrame.pack()

        self.usernameEntry = EntryPlaceholder(self.usernameFrame, "Username")
        self.usernameEntry.pack()


class EntryPlaceholder(Entry, object):

    def __init__(self, master=None, placeholder="placeholder"):
       super(EntryPlaceholder, self).__init__()

       self.placeholder = placeholder

       self.bind("<FocusIn>", self.clearText)
       self.bind("<FocusOut>", self.insertText)

       self.insertText()

    def insertText(self, *args):
        if self.get() == "":
            self.insert(0, self.placeholder)

    def clearText(self, *args):
        if self.get() == self.placeholder:
            self.delete(0, END)

root = tk.Tk()
gui = GUI(root)
root.mainloop()

The widget just gets placed onto the root frame.

Answer 1

Consider this code:

def __init__(self, master=None, placeholder="placeholder"):
   super(EntryPlaceholder, self).__init__()

You aren't passing master on to the __init__ of EntryPlaceHolder , so it's being put in the root window.

That code needs to be this:

def __init__(self, master=None, placeholder="placeholder"):
   super(EntryPlaceholder, self).__init__(master)