如何在特定时间间隔刷新tkinter表（用于更新）？

Question

规格：

Python3， PostgreSQL中， psycopg2， tkinnter提前

感谢

class MultiColumnListbox(object): 
"""use a ttk.TreeView as a multicolumn ListBox""" 

def __init__(self): 
    self.tree = None 
    self._setup_widgets() 
    self._build_tree() 

def _setup_widgets(self): 
    s = """WOW CALL LIST""" 
    msg = ttk.Label(wraplength="4i", justify="left", anchor="n", 
     padding=(10, 2, 10, 6), text=s) 
    msg.pack(fill='x') 
    container = ttk.Frame() 
    container.pack(fill='both', expand=True) 
    # create a treeview with dual scrollbars 
    self.tree = ttk.Treeview(columns=car_header, show="headings") 
    vsb = ttk.Scrollbar(orient="vertical", 
     command=self.tree.yview) 
    hsb = ttk.Scrollbar(orient="horizontal", 
     command=self.tree.xview) 
    self.tree.configure(yscrollcommand=vsb.set, 
     xscrollcommand=hsb.set) 
    self.tree.grid(column=0, row=0, sticky='nsew', in_=container) 
    vsb.grid(column=1, row=0, sticky='ns', in_=container) 
    hsb.grid(column=0, row=1, sticky='ew', in_=container) 
    container.grid_columnconfigure(0, weight=1) 
    container.grid_rowconfigure(0, weight=1) 



def _build_tree(self): 



     for col in car_header: 
      self.tree.heading(col, text=col.title(), 
       command=lambda c=col: sortby(self.tree, c, 0)) 
      # adsjust the column's width to the header string 
      self.tree.column(col, 
       width=tkFont.Font().measure(col.title())) 

     for item in car_list: 
      self.tree.insert('', 'end', values=item) 
      # adjust column's width if necessary to fit each value 
      for ix, val in enumerate(item): 
       col_w = tkFont.Font().measure(val) 
       if self.tree.column(car_header[ix],width=None)<col_w: 
        self.tree.column(car_header[ix], width=col_w) 

def sortby(tree, col, descending): 
    """sort tree contents when a column header is clicked on""" 
    # grab values to sort 
    data = [(tree.set(child, col), child) \ 
     for child in tree.get_children('')] 
    # if the data to be sorted is numeric change to float 
    #data = change_numeric(data) 
    # now sort the data in place 
    data.sort(reverse=descending) 
    for ix, item in enumerate(data): 
     tree.move(item[1], '', ix) 
    # switch the heading so it will sort in the opposite direction 
    tree.heading(col, command=lambda col=col: sortby(tree, col, \ 
     int(not descending))) 

# the test data ... 

con = psycopg2.connect("dbname='wowcall' user='postgres' password='Admin@123'") 
cur = con.cursor() 

cur.execute("SELECT * FROM wowdata") 
car_list = cur.fetchall() 


car_header = ['WOW ID',' Agent Name','Customer No'] 

if __name__ == '__main__': 
    root = tk.Tk() 
    root.title("WOW Call") 
    listbox = MultiColumnListbox() 
    root.mainloop() 

如何自动刷新表中特定的时间间隔？

如何在特定的时间间隔内自动刷新表格？ 如何在特定的时间间隔内自动刷新表格？

Answer 1

编写一个刷新表的函数。在这一功能，有它调用本身after：

def refresh_table(): 
    <do whatever you need to refresh the table> 

    # call again in 10 seconds 
    root.after(10000, refresh_table) 

然后，一旦调用该函数，它将运行，直到程序退出。

refresh_table()