当我打开应用程序时，它会打开，当我单击图像时它会打开，但是当我再次按n键时，它会抛出一个异常提示
“流已经听过”。
这是我的代码：
import time
from time import sleep
from datetime import datetime
import math # provides math functions
from tkinter import * # provides GUI capability
from tkinter import ttk
from tkinter import messagebox
import tkinter as tk
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
# Set root window to center of screen. Parameters are size of window itself.
def center_window(self, width=300, height=200):
# get screen width and height
screen_width = self.winfo_screenwidth()
screen_height = self.winfo_screenheight()
# calculate position x and y coordinates
x = (screen_width/2) - (width/2)
y = (screen_height/2) - (height/2)
self.geometry('%dx%d+%d+%d' % (width, height, x, y))
def alldone(*args):
global running
running = False
root = Tk() # Create base window class as root
root.wm_title("Green Canyon APFM System Ver: 0.6")
center_window(root,1024,580)
running = True
root.protocol("WM_DELETE_WINDOW", alldone) # Define routine to call if window closes
time_plot = []
clear_plot = []
plot_plot = []
draw_plot = []
figure3 = plt.Figure(figsize=(9.9,5.8), dpi=100)
ax3 = figure3.add_subplot(111)
ax3.plot(time_plot,clear_plot,"r-", label="clear() call") # Red line
ax3.plot(time_plot,plot_plot,"g-", label="plot() calls") # Green line
ax3.plot(time_plot,draw_plot,"b-", label="clear() call") # Blue line
scatter3 = FigureCanvasTkAgg(figure3, root)
scatter3.get_tk_widget().grid(column=0, row=0, rowspan=2)
ax3.legend(loc=6)
ax3.set_xlabel('Time (secs)')
ax3.set_ylabel('Task time (sec) for the calls')
ax3.set_title(' EndTime = '+datetime.now().strftime("%H:%M:%S"))
ax3.grid()
scatter3.draw()
loopclock = time.time()
pclock = 0.0
"""-------------------------------------------------------------------------------
Main Loop
-------------------------------------------------------------------------------"""
t2=t3=t4=t5=t6=t7=t8=0.0
t2a=t3a=t4a=t5a=t6a=t7a=t8a=0.0
nn = 0
while running:
c2 = time.time()
"""----------------------------------------------------------------------
This segment update the plot on the screen
----------------------------------------------------------------------"""
ax3.clear()
c3 = time.time()
t2 = c3 - c2
ax3.plot(time_plot,clear_plot,"r-", label="clear() call") # Red line
ax3.plot(time_plot,plot_plot,"g-", label="plot() calls") # Green line
ax3.plot(time_plot,draw_plot,"b-", label="draw() call") # Blue line
c4 = time.time()
t3 = c4 - c3
ax3.legend(loc=6)
c5 = time.time()
t4 = c5 - c4
ax3.set_xlabel('Time (secs)')
ax3.set_ylabel('Voltage (V)')
c6 = time.time()
t5 = c6 - c5
looptime = time.time() - loopclock
loopclock = time.time()
ax3.set_title(' EndTime = '+datetime.now().strftime("%H:%M:%S")+
" LT="+f"{looptime:.2f}"+
f"\n {nn:4d}|{t2:.3f}|{t3:.3f}|{t4:.3f}|{t5:.3f}|{t6:.3f}|{t7:.3f}|{t8:.3f}")
ax3.grid()
c7 = time.time()
t6 = c7 - c6
scatter3.draw()
c8 = time.time()
t7 = c8 - c7
root.update()
c9 = time.time()
t8 = c9 - c8
# print out the max values in every 15 second intervals for plotting
t2a = max(t2,t2a)
t3a = max(t3,t3a)
t4a = max(t4,t4a)
t5a = max(t5,t5a)
t6a = max(t6,t6a)
t7a = max(t7,t7a)
t8a = max(t8,t8a)
nn += 1
if time.time() > pclock + 15.0:
pclock = time.time()
print(f"{nn:5d},{t2a:.4f}, {t3a:.4f}, {t4a:.4f}, {t5a:.4f}, {t6a:.4f}, {t7a:.4f}, {t8a:.4f}")
t2a=t2
t3a=t3
t4a=t4
t5a=t5
t6a=t6
t7a=t7
t8a=t8
xtime = (time.time() + 2209132800) % 60.0
if len(time_plot) >= 500:
time_plot.pop(0)
clear_plot.pop(0)
plot_plot.pop(0)
draw_plot.pop(0)
if len(time_plot) > 0 and time_plot[-1] > xtime: # If we are rolling over to the next minute, decrease all the old values by 1 minute
for j in range(len(time_plot)):
time_plot[j] -= 60.0
time_plot.append(xtime)
clear_plot.append(t2)
plot_plot.append(t4)
draw_plot.append(t7)
root.quit()
sys.exit()