pyuic5的唯一问题是每次更改ui文件时都必须重新创建python文件。
你也可以加载ui文件，这样你就不用每次都重新开始。

from PyQt5.QtWidgets import QMainWindow, QApplication, QPushButton, QLineEdit
from PyQt5 import uic
import sys

class UI(QMainWindow):
    def __init__(self):
        super(UI, self).__init__()

        # Load the ui file
        uic.loadUi("test_UI.ui", self)

        # Define our widgets
        self.btn = self.findChild(QPushButton, "submitBtn")
        self.lineEdit = self.findChild(QLineEdit, "lineEdit")

        # Show the app
        self.show()

app = QApplication(sys.argv)
UIWindow = UI()
app.exec_()