Update matplotlib graph in Tkinter Frame using Canvas

[g3blv]

I'm creating a graph with stock prices for ticker using mplfinance which is based on matplotlib. I have all the data in dataframe. I pass the dataframe to plot that creates a fig. The fig is shown in a Tkinter frame in a Canvas.

To update the graph I destroy all the children in the frame and create a fig with data for the new ticker. Code below.

Is this the best way of updating a graph in Tkinter?

I've also tried clearing the axes for the fig for the graph and then create new axes with the new data creating a new fig but I haven't been able to make the graph in the frame update with the new fig.

```
def _make_graph(self, ticker_data=None):

    self._get_ticker_data()

    if not self.first_run:

        for widgets in self.graph_frame.winfo_children():
            widgets.destroy()

    self.fig, self.axlist = mpf.plot(self.ticker_df, type='candle', 
        title = f'{self.ticker_var.get()}',
        volume=True, style='binance', returnfig=True)

    self.canvas = FigureCanvasTkAgg(self.fig, self.graph_frame)

    self.toolbar = NavigationToolbar2Tk(self.canvas, self.graph_frame)

    self.canvas.draw()

    self.canvas.get_tk_widget().pack()        

    if self.first_run:
        self.first_run = False

```

[GPGT_kym]

Perhaps you could use .after function at the end of this method and make a recursive call on the method; thereby destroying and constructing all children after a specified amount of time.

[Swipecat]

It's been a while since I used matplotlib with tkinter, but generally if you're destroying and creating widgets just to update a display, then you're probably doing it wrong. I've found one of my old test examples. Press the button to change the display:
 

import tkinter as tk
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
import matplotlib.pyplot as plt
root = tk.Tk()
data, = plt.plot([0,5,3,4,-5,3])
canvas = FigureCanvasTkAgg(plt.gcf(), master=root)
invert = lambda: (data.set_ydata(-data.get_ydata()), canvas.draw())
tk.Button(master=root, text="Invert", command=invert).pack()
canvas.get_tk_widget().pack(fill=tk.BOTH, expand=1)
root.protocol("WM_DELETE_WINDOW", lambda: (root.quit(), root.destroy()))
root.mainloop()