matplotlib和枕頭（PIL）不兼容？

Question

我有以下程序，如果我運行該程序將不起作用：

import tkinter as tk
import matplotlib.pyplot as plt
import numpy as np
from PIL import Image, ImageTk

##MATPLOTLIB STUFF --------------------------------------------
fig, ax = plt.subplots(figsize = (5,5))

x = np.arange(10)
y = np.random.randn(10)

ax.plot(x,y)
fig.savefig('image1.png', bboxtoinches = 'tight')


##PIL STUFF --------------------------------------------------
root = tk.Tk()

graph = ImageTk.PhotoImage(file="image1.png")
w1 = tk.Label(root, image=graph).pack(side='right')

explanation = "A matplotlib plot"
w2 = tk.Label(root, justify=tk.LEFT, padx=10, 
text=explanation).pack(side='left')

root.mainloop()

但是，如果我刪除了matplotlib的東西並運行，它可以工作嗎

import tkinter as tk
import matplotlib.pyplot as plt
import numpy as np
from PIL import Image, ImageTk

##PIL STUFF --------------------------------------------------
root = tk.Tk()

graph = ImageTk.PhotoImage(file="image1.png")
w1 = tk.Label(root, image=graph).pack(side='right')

explanation = "A matplotlib plot"
w2 = tk.Label(root, justify=tk.LEFT, padx=10, 
text=explanation).pack(side='left')

root.mainloop()

事實上，似乎引起問題的那條線是

fig, ax = plt.subplots(figsize = (5,5))

如果我包括此行，則會出現以下錯誤：

Traceback (most recent call last):
  File "proj_1_images.py", line 20, in <module>
    w1 = tk.Label(root, image=graph).pack(side='right')
  File "C:\Users\Luke Polson\AppData\Local\Programs\Python\Python36\lib\tkinter\__init__.py", line 2760, in __init__
    Widget.__init__(self, master, 'label', cnf, kw)
  File "C:\Users\Luke Polson\AppData\Local\Programs\Python\Python36\lib\tkinter\__init__.py", line 2293, in __init__
    (widgetName, self._w) + extra + self._options(cnf))
_tkinter.TclError: image "pyimage10" doesn't exist

為什么matplotlib會導致此錯誤？

Answer 1

代碼對我來說運行順利，您的問題是pyimage10存儲在內存中，但是找不到路徑，重新啟動內核並清除內存中所有已聲明的變量將解決此問題。