目录

1、问题展示

2.问题原因

3.问题解决方案

4、修改代码如下

4.1 修改前

4.2修改后

5、代码执行结果

1、问题展示

<code>Traceback (most recent call last):

File "E:\workspace\python_project\aitest\test1.py", line 20, in <module>

do_test()

File "E:\workspace\python_project\aitest\test1.py", line 15, in do_test

plt.plot(x, y, 'r-', linewidth=3)

File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 3575, in plot

return gca().plot(

File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 2525, in gca

return gcf().gca()

File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 1000, in gcf

return figure()

File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 934, in figure

manager = new_figure_manager(

File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 464, in new_figure_manager

_warn_if_gui_out_of_main_thread()

File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 441, in _warn_if_gui_out_of_main_thread

canvas_class = cast(type[FigureCanvasBase], _get_backend_mod().FigureCanvas)

File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 280, in _get_backend_mod

switch_backend(rcParams._get("backend")) # type: ignore[attr-defined]

File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 343, in switch_backend

canvas_class = module.FigureCanvas

AttributeError: module 'backend_interagg' has no attribute 'FigureCanvas'. Did you mean: 'FigureCanvasAgg'?

2.问题原因

从问题中可以看到 ：module  是设置成 backend_interagg 即 backend  是 agg 

从源码中，我们可以看到，matplotlib.pylot 的默认 backend 是设置成agg的

源码

<code> global _backend_mod

# make sure the init is pulled up so we can assign to it later

import matplotlib.backends

if newbackend is rcsetup._auto_backend_sentinel:

current_framework = cbook._get_running_interactive_framework()

mapping = {'qt': 'qtagg',

'gtk3': 'gtk3agg',

'gtk4': 'gtk4agg',

'wx': 'wxagg',

'tk': 'tkagg',

'macosx': 'macosx',

'headless': 'agg'}

if current_framework in mapping:

candidates = [mapping[current_framework]]

else:

candidates = []

candidates += [

"macosx", "qtagg", "gtk4agg", "gtk3agg", "tkagg", "wxagg"]

# Don't try to fallback on the cairo-based backends as they each have

# an additional dependency (pycairo) over the agg-based backend, and

# are of worse quality.

for candidate in candidates:

try:

switch_backend(candidate)

except ImportError:

continue

else:

rcParamsOrig['backend'] = candidate

return

else:

# Switching to Agg should always succeed; if it doesn't, let the

# exception propagate out.

switch_backend("agg")

rcParamsOrig["backend"] = "agg"

return

3.问题解决方案

修改backend 方案,由于是通过 matplotlib引入 ，因此可以将matplotlib.backends进行修改

# make sure the init is pulled up so we can assign to it later

import matplotlib.backends

backends的参数有如下

if newbackend is rcsetup._auto_backend_sentinel:

current_framework = cbook._get_running_interactive_framework()

mapping = {'qt': 'qtagg',

'gtk3': 'gtk3agg',

'gtk4': 'gtk4agg',

'wx': 'wxagg',

'tk': 'tkagg',

'macosx': 'macosx',

'headless': 'agg'}

if current_framework in mapping:

candidates = [mapping[current_framework]]

else:

candidates = []

candidates += [

"macosx", "qtagg", "gtk4agg", "gtk3agg", "tkagg", "wxagg"]

我们修改 backend 配置：matplotlib.use(‘TkAgg’)

4、修改代码如下

4.1 修改前

import matplotlib.pyplot as plt

def do_test():

plt.plot([1, 2, 3, 4])

plt.ylabel('some numbers')

plt.show()

if __name__ == '__main__':

do_test()

4.2修改后

import matplotlib

import matplotlib.pyplot as plt

matplotlib.use('TkAgg')

def do_test():

plt.plot([1, 2, 3, 4])

plt.ylabel('some numbers')

plt.show()

if __name__ == '__main__':

do_test()

5、代码执行结果

执行官网例子，将列表画成线