CODE EXAMPLE FOR PYTHON

tree view width

tree["columns"]=("one","two","three")
tree.column("#0", width=270, minwidth=270, stretch=tk.NO)
tree.column("one", width=150, minwidth=150, stretch=tk.NO)
tree.column("two", width=400, minwidth=200)
tree.column("three", width=80, minwidth=50, stretch=tk.NO)