Python Tkitner : unknown option "-height". Can't change the size of button

This is one of the prime examples of why global imports are bad.You write at the top:

from tkinter import *from tkinter.ttk import *

This means that you import everything from tkinter and tkinter.ttk into your main.py namespace. Then you write for example:

frame3 = Frame(self, bg="grey")....lblCol = Label(frame2, text="Column", width=7)

These are Frame/Label objects, but which ones? The one in tkinter or the one in tkinter.ttk? If it is the first, you will have to set the height with -height, else you will have to use tkinter.ttk.Style(). Same with the -bg for the frame.

Solution:

import tkinter as tkclass Example(tk.Frame):    def __init__(self,master):        super().__init__()        master.minsize(width=350, height=160)        master.maxsize(width=650, height=500)        self.initUI()    def initUI(self):        self.master.title("Hank (version 3)")        self.pack(fill=tk.BOTH, expand=True)        frame1 = tk.Frame(self)        frame1.pack(fill=tk.X)        #dataset        lbl1 = tk.Label(frame1, text="Dataset file_name", width=18)        lbl1.pack(side=tk.LEFT, padx=5, pady=5)        entryDataset= tk.Entry(frame1)        entryDataset.pack(fill=tk.X, padx=5, expand=True)        #row col begin        frame2 = tk.Frame(self)        frame2.pack(fill=tk.X)        lblRow = tk.Label(frame2, text="Row", width=6)        lblRow.pack(side=tk.LEFT, padx=5, pady=5)        entryRow = tk.Entry(frame2, width=5)        entryRow.pack(side=tk.LEFT, padx=0, expand=True)        lblCol = tk.Label(frame2, text="Column", width=7)        lblCol.pack(side=tk.LEFT, padx=5, pady=5)        entryCol = tk.Entry(frame2, width=5)        entryCol.pack(side=tk.LEFT, padx=5, expand=True)        lblBegin = tk.Label(frame2, text="Start at", width=6)        lblBegin.pack(side=tk.LEFT, padx=5, pady=5)        entryBegin = tk.Entry(frame2, width=5)        entryBegin.pack(side=tk.LEFT, padx=0, expand=True)        frame3 = tk.Frame(self, bg="grey")        frame3.pack(fill=tk.BOTH, expand=True)        frame4 = tk.Frame(self)        frame4.pack(fill=tk.BOTH, expand=True)        startbutton = tk.Button(frame4, text="Start Clustering", height="100", width="100")        startbutton.pack(side=tk.RIGHT, padx=5, pady=5)def main():    root = tk.Tk()    root.geometry("300x160+300+160")    app = Example(root)    root.mainloop()if __name__ == '__main__':    main()

I did it here with the tkinter widgets. You can obviously do import tkinter.ttk as ttk and rewrite the code using those, it is just a matter of taste.