python tkinter - 从树视图列添加值

Question

我的 GUI 中有树视图（n=行，3 列）。当用户在标签中输入值并按下按钮时，行会不断增加。假设用户输入了 3 个值，即 3 行被插入到我的树视图中。现在，我想将其中一列中的值相加并将其显示在另一个标签中。我该怎么做？

def __init__(self, parent, controller):
    self.entry=ttk.Entry(self,width=10,)
    self.entry.grid(row=2, column=2, ) #value entered by the user and displayed in Temp column
    self.entry1=ttk.Entry(self,width=10,)
    self.entry1.grid(row=2, column=3, )#value entered by the user and displayed in time column
    ttk.Button(self, text='Enter', command=self.insert_data).grid(row=2,column=4, )#calling the method insert data to insert the values entered by the user
    self.tree = ttk.Treeview( self, columns=('Temp','time'))
    self.tree.heading('#0', text='Number')
    self.tree.heading('#1', text='Temp')
    self.tree.heading('#2', text='time')
    self.tree.column('#1', stretch=tk.YES)
    self.tree.column('#2', stretch=tk.YES)
    self.tree.column('#0', stretch=tk.YES)
    self.tree.grid(row=5, columnspan=4, sticky='nsew')
    self.treeview = self.tree
    # Initialize the counter
    self.i = 1

    ttk.Label(self, text='Sum').grid(row=6, column=1, sticky='e') 
    ttk.Label(self,width = 10,).grid(row=6, column=2, sticky="e") #***I want to display the sume of values entered in the column 'Temp' in this label
def insert_data(self):

    self.treeview.insert('', 'end', text=str(self.i), values=(self.entry.get(), self.entry1.get()+"h"))
    # Increment counter
    self.i = self.i + 1 

Answer 1

如果我了解您想计算插入到 treeview 列中的总值。为此，您需要首先使用tree.get_children() 获取treeview 中的内容，然后对其进行迭代并使用index 来获取要汇总值的列。在我的代码中是index[0]。我函数中的这个sum1 += 表示将列中的所有值相加。

您可以将索引更改为 [1] 查看总值。

import tkinter as tk
import tkinter.ttk as ttk


def my_values_cal():
    sum1 = 0.0
    for child in tree.get_children():
        sum1 += float(tree.item(child, "values")[0])
        lab.config(text=sum1)

        print(sum1)



root = tk.Tk()

tree =ttk.Treeview(root, column=("col1", "col2", "col3"), show="headings")
tree.heading('#1', text='Number')
tree.heading('#2', text='Temp')
tree.heading('#3', text='time')


tree.insert("", tk.END, values=(24, "09", "2:00 AM"))
tree.insert("", tk.END, values=(34, "04", "5:00 AM"))
tree.insert("", tk.END, values=(40, "09", "1:00 PM"))
tree.insert("", tk.END, values=(94, "01", "23:00 PM"))
tree.insert("", tk.END, values=("38", "21", "21:00 AM"))

tree.pack()

lab = tk.Label(root, text="Total")
lab.pack()


b = tk.Button(root, text="CALCULATE", command=my_values_cal)
b.pack()


root.mainloop()