import Tkinter as tk 
def fileSave():
    c.postscript(file='XXX.ps',height=300, width=300, fontmap=(font,size_font),colormode="mono")
        
master1 = tk.Tk()
master1.geometry('300x300')
frame1=tk.Frame(master1)
frame1.pack(side=tk.TOP,fill=tk.X)
frame2=tk.Frame(master1)
frame2.pack(side=tk.TOP, fill=tk.BOTH,expand=tk.NO)
font = 'txt'
size_font=30
button_seve=tk.Button(frame1,text="save",font=('txt 12'),command = fileSave)
button_seve.pack(side = tk.LEFT)
canvas=tk.Canvas(frame2)
c=canvas
c.pack(side=tk.LEFT, fill=tk.BOTH, expand=tk.YES)
t=u'\u2205'
c.create_text(100,100,text=t, font=(font,size_font),fill='black')
c.create_line(120,120,120,80,fill='black')
master1.mainloop()