下面是整个脚本的有效部分，仅是必要的部分。在下面的步骤中，我解释了输入的工作方式（如果要运行程序），因为我正在使用一个检测用户何时按Enter键的库（该库为“ pynput” ）。 。以防万一，如果与此问题有关。如果要正确运行程序，请按照正确的顺序进行操作。
问题部分在脚本的末尾。如果您运行此脚本，请执行以下操作，您会在控制台中看到以下内容："I'M A PRINT FUNCTION WORKING FINE"在这些行之前；
print (list(y))
del list(y)[0]
print (type(y))
这是我的问题开始的地方。它不会引发任何错误（我希望应该有NameError：未定义名称'y'），它不会关闭PyQt5窗口，也不会在整个脚本的任何地方'y' 中未定义任何内容时做出响应。我在此处放置了一个测试按钮以表明该程序在此部分之后可以正常工作。
为什么在任何地方都没有定义y时它没有引发任何错误，或者至少关闭了PyQt5的主窗口？就像它忽略它并继续工作一样，根本没有响应。
我在这里缺少什么吗？还是我不了解PyQt5主循环如何工作？
要正确运行程序的输入步骤
例如要输入第一个QLineEdit（“ SET”标签旁边的）；
1-按'a'
2-按Enter
3-按'b'
4-按Enter
5-按Enter
例如要输入第二个QLineEdit（“ TOP”标签旁边的）；
1-按'a'
2-按Enter键
3-按Enter
4-按'a'
5-按Enter
6-按“ b”
7-按Enter
8-按Enter
9-按下Enter
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from pynput.keyboard import Key, Listener
from itertools import combinations
import sys
import re
class Window(QMainWindow):
def __init__(self):
super(Window, self).__init__()
##BELOW DETECTS WHEN THE USER PRESS ENTER
self.listener = Listener(on_press=self.on_press)
self.listener.start()
self.listener1 = Listener(on_press=self.on_press_top)
##CENTERING THE SCREEN
def center(self):
qr = QMainWindow.frameGeometry()
cp = QDesktopWidget().availableGeometry().center()
qr.moveCenter(cp)
self.move(qr.topLeft())
##JUST GUI
self.setWindowTitle("Foo")
self.setFixedSize(950, 710)
self.setStyleSheet("background-color: rgb(119,136,153)")
QApplication.setOverrideCursor(Qt.PointingHandCursor)
##SET -LINE EDIT
self.kume_edit = QLineEdit(self)
self.kume_edit.setText("{")
self.kume_edit.setStyleSheet("QLineEdit{ background-color: orange; color: blue; font: 11 }")
fnt = self.kume_edit.font()
fnt.setPointSize(15)
self.kume_edit.setFont(fnt)
self.kume_edit.setGeometry(140, 300, 300, 30)
##
##SET -LABEL
self.kume_label = QLabel(self)
self.kume_label.setText("SET:")
self.kume_label.setStyleSheet("QLineEdit{ background-color: orange; color: blue; font: 11 }")
fnt1 = self.kume_label.font()
fnt1.setPointSize(15)
self.kume_label.setFont(fnt1)
self.kume_label.setGeometry(50, 300, 60, 32)
##
##TOPOLOGY -LINE EDIT
self.top_edit = QLineEdit(self)
self.top_edit.setText("{{")
self.top_edit.setStyleSheet("QLineEdit{ background-color: orange; color: blue; font: 11 }")
fnt2 = self.top_edit.font()
fnt2.setPointSize(15)
self.top_edit.setFont(fnt2)
self.top_edit.setGeometry(140, 400, 300, 30)
##
##TOPOLOGY -LABEL
self.topo_label = QLabel(self)
self.topo_label.setText("TOP:")
self.topo_label.setStyleSheet("QLineEdit{ background-color: orange; color: blue; font: 11 }")
fnt3 = self.topo_label.font()
fnt3.setPointSize(15)
self.topo_label.setFont(fnt3)
self.topo_label.setGeometry(50, 400, 80, 32)
##
##FUNCTION CHANGES THIS LABEL WHEN THE DESIRED CONDITION OCCURS
self.top_label = QLabel(self)
fnt4 = self.top_label.font()
fnt4.setPointSize(15)
self.top_label.setFont(fnt4)
self.top_label.setGeometry(140, 450, 900, 30)
##
##BUTTON SHOWS THAT THE PROGRAM WORKING FINE
##CLICK THIS BUTTON BEFORE AND AFTER YOU RUN
but = QPushButton(self)
but.setGeometry(500,400,50,50)
but.setText("Click Me")
but.clicked.connect(self.but_test)
self.count_test = 0
##
self.top_ = 0
self.kord_ = 300
self.show()
def but_test(self): #########CLICK THIS BUTTON
self.count_test += 1 #########TO SEE THAT ITS WORKING AFTER 'print(type(y))' PART
self.top_label.setText("The program working fine {}".format(self.count_test))
def on_press(self,key): #########THIS DETECTS WHEN THE USER PRESS "ENTER" IN 'SET QLINEEDIT'
if key == Key.enter:
if self.kume_edit.text()[-1] == ",":
self.kume_edit.setText(self.kume_edit.text()[:-1] + "}")
self.kume_edit.setReadOnly(True)
self.listener1.start()
self.listener.stop()
else:
self.kume_edit.setText(self.kume_edit.text() + ",")
def on_press_top(self,key): #########THIS DETECTS WHEN THE USER PRESS "ENTER" IN 'TOPOLOGY QLINEEDIT'
if key == Key.enter:
self.top_ += 15
if self.top_ > 220:
self.kord_ += 15
self.top_edit.setGeometry(140, 400, self.kord_, 30)
if self.top_edit.text()[-1] == "{":
self.top_edit.setText(self.top_edit.text()[:-2])
self.top_edit.setText(self.top_edit.text() + "}")
self.top_edit.setReadOnly(True)
self.top_edit.setGeometry(140, 400, self.kord_, 30)
self.topoloji_mi() #####################HERE THE FUNCTION IS CALLED - ONLY HERE
self.listener1.stop()
elif self.top_edit.text()[-1] == ",":
self.top_edit.setText(self.top_edit.text()[:-1] + "}")
self.top_edit.setText(self.top_edit.text() + ",")
self.top_edit.setText(self.top_edit.text() + "{")
else:
self.top_edit.setText(self.top_edit.text() + ",")
def kumetop(self): #############THIS JUST RETURNS TWO LISTS
reg = r"\{(.*?)\}"
matches = re.findall(reg, self.top_edit.text()[1:-1])
top_set = []
top_set.append(set())
for x in matches:
top_set.append(set(x.split(",")))
kume_set = []
for x in self.kume_edit.text():
if x.isalnum():
kume_set.append(set(x.split(",")))
return kume_set,top_set
def topoloji_mi(self): #################PROB FUNCTION #######################################
kume_set,top_set = self.kumetop() ###TAKING THE LISTS
for x in combinations(top_set, 2):
################WHATS THIS
print ("IM A PRINT FUNCTION WORKING FINE") ###THIS PRINT WORKS
print(list(y))
del list(y)[0] #######PYCHARM RAISE NO ERROR, WINDOW IS ALSO WORKING
print (type(y)) ###CLICK THE TEST BUTTON
if len(z) == len(list(y)) and all([z.count(i) == list(y).count(i) for i in kume_set]):
self.top_label.setText("BLABLABLA")
print("IM NOT WORKING")
def close_application(self):
sys_exit()
def run():
app = QApplication(sys.argv)
GUI = Window()
sys.exit(app.exec_())
run()