Learning Python/Tkinter and struggling with the text object

Thanks in advance for any help! I'm just learning Python and Tkinter. Can 
anyone suggest why this program does not insert 'some text' into text box 
t1 when the start button is clicked? No errors are thrown when I run the 
program in PyCharm

from tkinter import *

class Window(Frame):
    t1 = []
    def __init__(self, master=None)
        Frame.__init__(self, master)
        self.master = master
        self.master.title("My Title")
        StartButton = Button(self, text="Start", command=self.start, bg=
'#006ba6', fg="white")
        StartButton.grid(row=0, columnspan=3, sticky=(N, S, W, E))
        Label(self, text="Your Name").grid(row=1, sticky=(N, S, W, E))
        t1 = Text(self, height=2)
        t1.grid(row=1, column=1, sticky=(N, S, W, E))
        self.t1.insert( 0, 'some text')
        quitButton = Button(self, text="Quit", command=self.client_quit, 
bg='#006ba6', fg="white")
        quitButton.grid(row=5, columnspan=3, sticky=(N, S, W, E))
        self.grid(sticky=(N, S, W, E))

    def start(self):
        self.t1.insert(0, 'some text')

    def client_quit(self):
        exit()

root = Tk()
root.geometry()
app = Window(root)
root.mainloop()

Alan Dickman
IBM Cloud Technical Sales Specialist, Process Transformation
North America Public Sector
Email: [email protected] 
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