Python:从另一个文件访问类方法变量

Question

我有一个PyQt5 GUI代码，它有一个Ui_MainWindow类，这个类有一个setupUI方法。这是我的gui.py:

import io
import sys
import os
import core as c
from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(1022, 637)
MainWindow.setMinimumSize(QtCore.QSize(1022, 637))
MainWindow.setMaximumSize(QtCore.QSize(1022, 637))
font = QtGui.QFont()
font.setKerning(False)
MainWindow.setFont(font)
MainWindow.setMouseTracking(True)
MainWindow.setFocusPolicy(QtCore.Qt.NoFocus)
.
.
.
self.lineEditSiteX = QtWidgets.QLineEdit(self.centralwidget)
self.actionCalculate.triggered.connect(c.cal) # Here is where I'm stuck!!!!!!!!!!!!!!!!!!!!

if __name__ == "__main__":
import sys
app = QtWidgets.QApplication.instance()
if app is None:
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())

在上面的评论中，我试图从另一个名为core.py的文件中调用一个函数，如下所示：

import gui
def cal():
val = gui.Ui_MainWindow().lineEditSiteX.value()
return val ** (1/val*2)

我只是想当有人点击Calculte时，lineEdit值将通过core.py文件访问。但它给了我一个attributeError。我该怎么做？

Answer 1

您有两个错误：

• 业务逻辑不应该依赖于GUI，而GUI应该只使用业务逻辑
• PyQt建议创建一个从适当的小部件继承的类，并使用QtDesigner生成的类(有关更多信息，请阅读此处(

考虑到上述情况，解决方案为：

核心.py

def cal(val):
return val ** (1/val*2)

gui.py

import io
import sys
import os
import core as c
from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets

class Ui_MainWindow(object):
def setupUi(self, MainWindow):
# ... 
self.lineEditSiteX = QtWidgets.QLineEdit(self.centralwidget)

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
super().__init__(self, parent)
self.setupUi(self)
self.actionCalculate.triggered.connect(self.on_actionCalculate)
@QtCore.pyqtSlot()
def on_actionCalculate(self):
try:
val = float(self.lineEditSiteX.text())
except ValueError:
print("error")
finally:
res = c.cal(val)
print(res)

if __name__ == "__main__":
import sys
app = QtWidgets.QApplication.instance()
if app is None:
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())