从另一个 class 调用列表实例

Question

我想访问在我的主 window 上根据用户选择创建的列表，在我的第二个 window.

该列表是在 MainWindow 中使用 on_cc_pick 方法创建的。列表 creditcards.

在第二个 window，我想在 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 下做一个全局变量时 Class:

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

它始终默认为一个空列表。

这是我的代码，本质上我想访问在 class MainWindow 下 def on_cc_pick(self,text): 上创建的名为 creditcardsb 的列表 class CreditCardForm 在 def savecsv(self):

下

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进口产品，并非都与我的问题相关：

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，因为要传输的属性不依赖于 class，而是依赖于对象。所以正确的做法是创建一个方法来更新 window 的数据。此外，假设 CreditCardForm 将始终是 AddCreditCard 的子代，您可以使用 parentWidget() 从 CreditCardForm.

获得 AddCreditCard

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_())

从另一个 class 调用列表实例

calling a list instance from another class

python

pyside2