class MyLineEdit(QLineEdit):
  clicked = pyqtSignal()
  def mouseReleaseEvent(self, QMouseEvent):
    if QMouseEvent.button()==Qt.LeftButton:
      self.clicked.emit()

def eventFilter(self, widget, event):
  if widget == self.edit:
    if event.type() == QEvent.FocusOut:
      pass
    elif event.type() == QEvent.FocusIn:
      self.clicked.emit()   #當(dāng)焦點(diǎn)再次落到edit輸入框時(shí)，發(fā)送clicked信號(hào)出去
    else:
      pass
  return False

from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import sys

#方法1
class mylineedit(QLineEdit):
  clicked=pyqtSignal()  #定義clicked信號(hào)
  def mouseReleaseEvent(self, QMouseEvent):
    if QMouseEvent.button()==Qt.LeftButton:
      self.clicked.emit()   #發(fā)送clicked信號(hào)

class Wind(QDialog):
  clicked=pyqtSignal()
  def __init__(self):
    super().__init__()
    self.lnd=mylineedit()
    self.edit=QLineEdit()
    self.edit.installEventFilter(self)  #方法2(1)

    vb=QVBoxLayout()
    vb.addWidget(self.lnd)
    vb.addWidget(self.edit)
    self.setLayout(vb)

    self.lnd.clicked.connect(self.showData)
    self.clicked.connect(self.showData)   #該clicked信號(hào)是W1的信號(hào)而非edit的信號(hào)，但可以實(shí)現(xiàn)焦點(diǎn)落到edit時(shí)觸發(fā)信號(hào)

  # 方法2(2)
  def eventFilter(self, widget, event):
    if widget == self.edit:
      if event.type() == QEvent.FocusOut:
        pass
      elif event.type() == QEvent.FocusIn:
        self.clicked.emit()   #當(dāng)焦點(diǎn)再次落到edit輸入框時(shí)，發(fā)送clicked信號(hào)出去
      else:
        pass
    return False

  def showData(self):
    print('ok')

if __name__=="__main__":
  app=QApplication(sys.argv)
  w=Wind()
  w.show()
  sys.exit(app.exec_())