ValueError: shape mismatch: objects cannot be broadcast to a single shape

[诗岑]

向各位大神求教

import matplotlib.pyplot as plt
import matplotlib.font_manager as font_manager
import numpy as np
import csv
f=open("C:/Users/jyz_1/Desktop/datamodi.csv","r")
y_list=[]
t0=eval(input("时间间隔:"))
POINTS = 10*t0+1
y_list = [0] * POINTS
indx = 0
fig, ax = plt.subplots()
ax.set_ylim([0,40])
ax.set_xlim([0, POINTS])
ax.set_autoscale_on(False)
ax.set_xticks(range(0, 10*t0, t0))
ax.set_yticks(range(0,40,5))
ax.grid(True)
line_y, = ax.plot(range(POINTS), y_list, label='y output', color='cornflowerblue')
ax.legend(loc='upper center', ncol=4, prop=font_manager.FontProperties(size=10))
def y_output(ax):
    global indx, y_list, line_y
    if indx == 20:
        indx = 0
    indx += 1
    f=open("C:/Users/jyz_1/Desktop/datamodi.csv","r")
    y_list=[]
    reader=csv.reader(f)
    for low in reader:
        for y in low:
            y_list=np.append(y_list,eval(y))
    line_y.set_ydata(y_list)
    ax.draw_artist(line_y)
    ax.figure.canvas.draw()
timer = fig.canvas.new_timer(interval=100)
timer.add_callback(y_output, ax)
timer.start()
plt.show()  

报错：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\tkinter\__init__.py", line 1883, in __call__
    return self.func(*args)
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\tkinter\__init__.py", line 804, in callit
    func(*args)
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\site-packages\matplotlib\backends\_backend_tk.py", line 114, in _on_timer
    TimerBase._on_timer(self)
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\site-packages\matplotlib\backend_bases.py", line 1187, in _on_timer
    ret = func(*args, **kwargs)
  File "C:\Users\jyz_1\Desktop\sensor_ver1.py", line 32, in y_output
    ax.draw_artist(line_y)
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\site-packages\matplotlib\axes\_base.py", line 2644, in draw_artist
    a.draw(self.figure._cachedRenderer)
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\site-packages\matplotlib\lines.py", line 759, in draw
    self.recache()
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\site-packages\matplotlib\lines.py", line 679, in recache
    self._xy = np.column_stack(np.broadcast_arrays(x, y)).astype(float)
  File "<__array_function__ internals>", line 5, in broadcast_arrays
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\site-packages\numpy\lib\stride_tricks.py", line 264, in broadcast_arrays
    shape = _broadcast_shape(*args)
  File "C:\Users\jyz_1\AppData\Local\Programs\Python\Python38-32\lib\site-packages\numpy\lib\stride_tricks.py", line 191, in _broadcast_shape
    b = np.broadcast(*args[:32])
ValueError: shape mismatch: objects cannot be broadcast to a single shape