Adding values to specific column in treeview Tkinter

问题

I made a treeview, and I want to add values in first and second column and then the program needs to calculate the values that will put in third column when you press the ENTER button (I used events and binds). I do not know how to put values in the specific column in treeview , I always get this error:

TypeError: 'float' object is not subscriptable

I know how to insert values in every column at once, but I do not know how to insert only one value to a specific column, without changing the values in other columns. This is the function that I wrote:

def PlannedCosPerSize(event):

    try:
        for child in tree.get_children():
            Size=round(float(tree.item(child,"values")[1]),2)
            PlannedCost=round(float(tree.item(child,"values")[2]),2)
            PlanCostPerSize=float(round(PlannedCost/Size,2))

            tree.insert("","end", values=(PlanCostPerSize)[4])

            print(PlanCostPerSize)


    except IndexError:
        Error=messagebox.showinfo("error","You have error")
        pass

tree.bind('<Return>', PlannedCosPerSize)  # validate with Enter

回答1:

The insert method is creating a new item in the Treeview but what you want to do is editing an existing item, so this is not the method to use.

One possibility is to use the set method of the Treeview to either get or set the value in a specific column:

treeview.set(item, '#1') will give you the value in the first column.
treeview.set(item, '#3', new_value) will change the value of the third column into new_value.

You can also use the column's name (the one given in columns= when creating the Treeview) instead of '#<column number>'.

Another possibility is to use the item method:

old_values = treeview.item(item, 'values') will give you the values of the item.
treeview.item(item, values=(old_values[0], old_values[1], new_value)) will change the last value of the item.

Documentation on the Treeview widget: https://anzeljg.github.io/rin2/book2/2405/docs/tkinter/ttk-Treeview.html

来源：https://stackoverflow.com/questions/50024404/adding-values-to-specific-column-in-treeview-tkinter

标签

python

tkinter

treeview