Tags are available for ttk.Treeview items, so it is possible to bind event sequences for specific rows of our contacts table.

Let's suppose that we want to open a new window to write an email to a contact when we double-click on it; however, this should only work for records where the email field is filled in.

We can easily implement this by conditionally adding a tag to the items while inserting them, and then calling tag_bind() on the widget instance with the "<Double-Button-1>" sequence—here we simply refer to the implementation of the send_email_to_contact() handler function by its name:

    columns = ("Last name", "First name", "Email")
    tree = ttk.Treeview(self, show="headings", columns=columns)

    for contact in csv.reader(f):
        email = contact[2]
        tags = ("dbl-click",) if email else ()
        self.tree.insert("", tk.END, values=contact, tags=tags)

    tree.tag_bind("dbl-click", "<Double-Button-1>", send_email_to_contact)

Similar to what happens when binding events to Canvas items, always remember to add the tagged items to ttk.Treeview before calling tag_bind(), because the bindings are only added to existing matching items.