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I am trying to embed the panda plot to Tkinter.
I am able to display it; however I receive AttributeError: 'NoneType' object has no attribute 'update_idletasks' error, when the program first run and close.
Here is my code:

import matplotlib
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk
from matplotlib.figure import Figure
import pandas as pd
import tkinter as tk
import os
matplotlib.use("TkAgg")


LOCO_ANCHOR_DATA = "data_loco/loco_anchor"
POS_DATA = "data_loco/pos_data"


class ReportWindow:
 def __init__(self, master):
 self.master = master

 tk.Label(self.master, text="Report").grid(row=0, column=0)
 self.lf = tk.LabelFrame(self.master, text="Plot").grid(row=1, column=0, padx=3, pady=3)
 self.draw_plot()

 def draw_plot(self):
 fig = self.plot_data()

 canvas = FigureCanvasTkAgg(fig, master=self.lf)
 canvas.get_tk_widget().grid(row=1, column=0, padx=5, pady=5)

 def read_anchor_file(self, data_path=LOCO_ANCHOR_DATA):
 anchor_csv_path = os.path.join(data_path, "anchor_pos.csv")
 # print(pd.read_csv(csv_path))
 return pd.read_csv(anchor_csv_path)

 def read_pos_file(self, data_path=POS_DATA):
 pos_csv_path = os.path.join(data_path, "real_time_data.csv")
 # print(pd.read_csv(pos_csv_path))
 return pd.read_csv(pos_csv_path)

 def plot_data(self):
 fig = Figure(figsize=(5,4), dpi=100)
 plt.rc('grid', linestyle="--", color='black')
 axis = fig.add_subplot(111)
 anchor_pos_data = self.read_anchor_file()
 drone_pos_data = self.read_pos_file()
 drone_pos_data.plot(kind="scatter", x="xpos", y="ypos", alpha=0.4,
 s=50, label="Real Time Position",
 c="zpos", cmap=plt.get_cmap("jet"), colorbar=True, ax=axis)
 anchor_pos_data.plot(kind="scatter", x="y_direction", y="x_direction",
 label="Anchor Positions",
 color=(0, 0, 0), colorbar=False, ax=axis)
 plt.colormaps()
 plt.title("Flight Path Map")
 plt.grid(True)
 plt.legend(loc=0)
 # plt.show()
 return fig


if __name__ == '__main__':
 root = tk.Tk()
 report_gui = ReportWindow(master=root)
 root.mainloop()

Even though I am passing a Figure object, why do I still receive that error?

Best Regards

SOLUTION:

In python when you do a().b(), the result of the expression is whatever b() returns, therefore LabelFrame(...).grid(...) will return None.

So solution is changing the LabelFrame initializing to the followings:

self.lf = tk.LabelFrame(self.master, text="Plot")
self.lf.grid(row=1, column=0, padx=3, pady=3)

Then I stoped seeing the "update_idletasks" issue