import tkinter as tk
from tkinter import filedialog


def saveas():
    global text
    t=text.get("1.0", "end-1c")
    savelocation=filedialog.asksaveasfilename()
    file1=open(savelocation,"w+")
    file1.write(t)
    file1.close()


root=tk.Tk("Text Editor")

text=tk.Text(root)
text.grid()

botton=tk.Button(root,text="Save",command=saveas)
botton.grid()
root.mainloop()