python3 tkinter.ttk TreeView

Question

I'm creating a ttk.Treeview widget, using python3.8 I do not want the #0 column to stretch. I've tried every possible value for the "stretch" attribute to no avail.

stretch=tk.NO

stretch=False

stretch=0

Below is a example snippet

alarmframe = ttk.Treeview(master,selectmode='extended')
alarmframe['columns'] = ("alarmname","timestamp")
alarmframe.pack(side='top',anchor='nw')
alarmframe.column("#0",width=20,stretch=False)
      
for row in range(6) :
   alarmframe.insert('','end',values=("Alarm" + str(row)) ```