错误：ModuleNotFoundError：没有名为“pyqtgraph”的模块？

我一直在努力导入 pyqtgraph 模块。这实际上仅与导入有关：pip3 install pyqtgraph不起作用。我的代码：from PyQt5 import QtGui
import PyQt5
import numpy as np
from PyQt5.QtWidgets import QMainWindow, QApplication, QMessageBox
import pyqtgraph as pg
import time
叶子：

<ipython-input-37-14dc06d126e4> in <module>
     31 import numpy as np
     32 from PyQt5.QtWidgets import QMainWindow, QApplication, QMessageBox
---> 33 import pyqtgraph as pg
     34 import time
     35 import sys

ModuleNotFoundError: No module named 'pyqtgraph'