python - 从另一个类调用列表实例

Question

我想在第二个窗口上访问根据用户选择在主窗口上创建的列表。

该列表创建于 MainWindow下on_cc_pick方法。列表 creditcards .

在第二个窗口上，我想通过 CreditCardForm 访问它

当我尝试时。 MainWindow.creditcards或MainWindow.creditcardsb它告诉我对象没有属性creditcards/b。

当我尝试在 MainWindow 类下执行全局变量时:

class MainWindow(QtWidgets.QWidget):
     creditcards = []

它始终默认为空列表。

这是我的代码，本质上我想访问名为 creditcardsb 的列表在类 MainWindow 上创建下def on_cc_pick(self,text):上课CreditCardForm下def savecsv(self):

class AddCreditCard(QtWidgets.QMainWindow):

    def __init__(self, parent = None):
        super(AddCreditCard, self).__init__(parent)
        creditcardform = CreditCardForm(self)
        self.setCentralWidget(creditcardform)

class CreditCardForm(QtWidgets.QWidget):

    def savecsv(self):
        **print(MainWindow.creditcardsb)**

    def __init__(self, parent):
        super(CreditCardForm, self).__init__(parent) 
        self.addname = QtWidgets.QPushButton('Save')
        self.connect(self.addname,QtCore.SIGNAL("clicked()"), self.savecsv)

class MainWindow(QtWidgets.QWidget):


    def CreateCCForm(self):
        self.addwindow.show()

    def on_cc_pick(self, text):
        NickName = []
        Account = []
        with open(refdirectory + '/' + str(text) + '.csv') as csvDataFile:
            csvReader = csv.reader(csvDataFile)
            for row in csvReader:
                NickName.append(row[0])
                Account.append(row[1])

        **creditcardsb = list(zip(NickName,Account))
        self.creditcards = creditcardsb**


    def __init__(self, parent = None):
        super(MainWindow,self).__init__(parent)
        self.pickcard = QtWidgets.QComboBox(self)
        CreditCardNames = ['cc1','cc2','cc3']

        for cc in CreditCardNames:
             self.pickcard.addItem(cc)
        self.addcard = QtWidgets.QPushButton('Add Card')
        self.pickcard.activated[str].connect(self.on_cc_pick)
        self.connect(self.addcard, QtCore.SIGNAL("clicked()"),self.CreateCCForm)

        self.addwindow = AddCreditCard(self)

这些是我正在使用的导入，并非全部与我的问题相关:

from subprocess import Popen
from selenium import webdriver
from bs4 import BeautifulSoup
import string
import time
import random
import csv
import pandas as pd
from pick import pick
import requests
import re
import urllib.request
from urllib.request import urlopen
from selenium.webdriver.common.by import By
from tkinter import *
import tkinter as tk
import tkinter.filedialog as filedialog
import os
import pyodbc
from decimal import *
import sys
from PySide2 import QtCore, QtGui, QtWidgets
from datetime import datetime, date
from decimal import Decimal

Answer 1

不要使用静态变量，因为您要传输的属性不取决于类，而是取决于对象。所以正确的做法是创建一个更新窗口数据的方法。此外，假设 CreditCardForm 始终是 AddCreditCard 的子级，您可以使用 parentWidget() 获取 AddCreditCard来自CreditCardForm。

import os
import csv
from PySide2 import QtCore, QtWidgets

class AddCreditCard(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(AddCreditCard, self).__init__(parent)
        creditcardform = CreditCardForm()
        self.setCentralWidget(creditcardform)
        self._creditcards = []

    def setCreditcards(self, creditcards):
        self._creditcards = creditcards

    def creditcards(self):
        return self._creditcards

class CreditCardForm(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(CreditCardForm, self).__init__(parent) 
        self.addname = QtWidgets.QPushButton('Save')
        self.addname.clicked.connect(self.savecsv)
        lay = QtWidgets.QHBoxLayout(self)
        lay.addWidget(self.addname)

    @QtCore.Slot()
    def savecsv(self):
        creditcards = self.parentWidget().creditcards()
        print(creditcards)

class MainWindow(QtWidgets.QWidget):
    def __init__(self, parent = None):
        super(MainWindow,self).__init__(parent)
        self.addwindow = AddCreditCard(self)

        self.pickcard = QtWidgets.QComboBox()
        self.pickcard.activated[str].connect(self.on_cc_pick)
        creditcardnames = ['cc1','cc2','cc3']
        self.pickcard.addItems(creditcardnames)

        self.addcard = QtWidgets.QPushButton('Add Card')
        self.addcard.clicked.connect(self.addwindow.show)

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(self.addcard)
        lay.addWidget(self.pickcard)

    @QtCore.Slot(str)
    def on_cc_pick(self, text):
        creditcards = []
        refdirectory = ""
        filename = os.path.join(refdirectory, "{}.csv".format(text))
        with open(filename) as csvDataFile:
            csvReader = csv.reader(csvDataFile)
            for row in csvReader:
                creditcards.append((row[0], row[1]))
        self.addwindow.setCreditcards(creditcards)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())