python中使用import matplotlib.pyplot as plt的plt保存图片的时候，前三次总是没问题，第四次总是报错。
报错如下：
Exception ignored in: <bound method Image.__del__ of <tkinter.PhotoImage object at 0x000001B31B4E6470>>
Traceback (most recent call last):
File "C:\Python\Python36\lib\tkinter\__init__.py", line 3507, in __del__
self.tk.call('image', 'delete', self.name)
RuntimeError: main thread is not in main loop
Exception ignored in: <bound method Image.__del__ of <tkinter.PhotoImage object at 0x000001B31B4D5EB8>>
Traceback (most recent call last):
File "C:\Python\Python36\lib\tkinter\__init__.py", line 3507, in __del__
self.tk.call('image', 'delete', self.name)
RuntimeError: main thread is not in main loop
Exception ignored in: <bound method Image.__del__ of <tkinter.PhotoImage object at 0x000001B31B52F128>>
Traceback (most recent call last):
File "C:\Python\Python36\lib\tkinter\__init__.py", line 3507, in __del__
self.tk.call('image', 'delete', self.name)
RuntimeError: main thread is not in main loop
Tcl_AsyncDelete: async handler deleted by the wrong thread
解决办法：
# import matplotlib.pyplot as plt
import matplotlib
matplotlib.use('Agg')
from matplotlib import pyplot as plt
用下面的三行替换掉引用的一行即可
import sympy as sp # 导入sympy包
x = sp.Symbol('x') # 定义符号变量
f = x**3 - 3*x**2 + 3*x - 9/16 # 定义要求解的一元
三次
方程
x = sp.solve(f) # 调用solve函数求解方程
x # solve函数的返回结果是一个列表
# x的值为[0.240852757031084,1.37957362148446-0.657440797623999*I,1.379573621484
Python
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Trace...
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self.tk.call('image', 'delete', self.name)
RuntimeError: main thread is not in main loop
Tcl_AsyncDelete: async handler deleted by the wrong thread
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Exception ignored in: <bound method PhotoImage.__del__ of <tkinter.PhotoImage object at 0x0000000014FCFB70>>Traceback (most recent call last): File "C:\
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File "C:/Users/86177/PycharmProjects/untitled/csdn浏览量.py", line 1, in <module>
import requests
File "G:\PyCharm 2019.3\1\lib\site-packages\requests\__i
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