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_testplt.plot(x, y, 'r-', linewidth=3)File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 3575, in plotreturn gca().plot(File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 2525, in gcareturn gcf().gca()File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 1000, in gcfreturn figure()File "E:\workspace\python_project\aitest\venv\lib\site-packages\matplotlib\pyplot.py", line 934, in figuremanager = 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_threadcanvas_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_modswitch_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_backendcanvas_class = module.FigureCanvas
AttributeError: module 'backend_interagg' has no attribute 'FigureCanvas'. Did you mean: 'FigureCanvasAgg'?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
global _backend_mod# make sure the init is pulled up so we can assign to it laterimport matplotlib.backendsif 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:continueelse:rcParamsOrig['backend'] = candidatereturnelse:# Switching to Agg should always succeed; if it doesn't, let the# exception propagate out.switch_backend("agg")rcParamsOrig["backend"] = "agg"return解决方案
1、安装matplotlib3.5.0及以下版本
pip install matplotlib==3.5.0
2、指定后端TkAgg
import matplotlib
matplotlib.use('TkAgg')拓展
一次性显示多个图
plt.figure()
#figure1代码plt.figure()
#figure2代码
#……plt.show()
#只需要每张图前加入figure()，最后加show()即可多条曲线绘制在一张图
plt.figure()
plt.plot(x1,y1)
plt.plot(x2,y2)
#……
plt.show()
#一个figure()+一个show()一次只弹出一个独立窗口
#figure1
plt.figure()
plt.show()
#figure2
plt.figure()
plt.show()
#程序会一直等待手动关闭一个窗口后再继续运行代码
