from tkinter import *
from tkinter.ttk import *

root = Tk()
tree = Treeview(root,selectmode="extended",columns=("A","B"))

tree.pack(expand=YES, fill=BOTH)

tree.heading("#0", text="C/C++ compiler")
tree.column("#0",minwidth=80,width=100, stretch=NO)

tree.heading("A", text="A")   
tree.column("A",minwidth=0,width=200, stretch=NO)

tree.heading("B", text="B")   
tree.column("B",minwidth=0,width=300)

root.mainloop()
dfb0a54c21b002d0b1d027cf6ae4b40f740e94c3
<mask token>

<mask token>
tree.pack(expand=YES, fill=BOTH)
tree.heading('#0', text='C/C++ compiler')
tree.column('#0', minwidth=80, width=100, stretch=NO)
tree.heading('A', text='A')
tree.column('A', minwidth=0, width=200, stretch=NO)
tree.heading('B', text='B')
tree.column('B', minwidth=0, width=300)
root.mainloop()

<mask token>
root = Tk()
tree = Treeview(root, selectmode='extended', columns=('A', 'B'))
tree.pack(expand=YES, fill=BOTH)
tree.heading('#0', text='C/C++ compiler')
tree.column('#0', minwidth=80, width=100, stretch=NO)
tree.heading('A', text='A')
tree.column('A', minwidth=0, width=200, stretch=NO)
tree.heading('B', text='B')
tree.column('B', minwidth=0, width=300)
root.mainloop()

from tkinter import *
from tkinter.ttk import *
root = Tk()
tree = Treeview(root, selectmode='extended', columns=('A', 'B'))
tree.pack(expand=YES, fill=BOTH)
tree.heading('#0', text='C/C++ compiler')
tree.column('#0', minwidth=80, width=100, stretch=NO)
tree.heading('A', text='A')
tree.column('A', minwidth=0, width=200, stretch=NO)
tree.heading('B', text='B')
tree.column('B', minwidth=0, width=300)
root.mainloop()

from tkinter import *
from tkinter.ttk import *

root = Tk()
tree = Treeview(root,selectmode="extended",columns=("A","B"))

tree.pack(expand=YES, fill=BOTH)

tree.heading("#0", text="C/C++ compiler")
tree.column("#0",minwidth=80,width=100, stretch=NO)

tree.heading("A", text="A")   
tree.column("A",minwidth=0,width=200, stretch=NO)

tree.heading("B", text="B")   
tree.column("B",minwidth=0,width=300)

root.mainloop()