我正在编写用于制作桌面应用程序的代码。我想在弹出屏幕时自动单击Refresh button，以刷新较早的记录。但是不知何故，我无法这样做。
我已经写了一个代码来更新标签，但是没有用。
之后，我尝试在self.refresh_record()之间的方法中调用__init__，该方法也正在更新标签，但是随后进行了无限递归。
class ClassMainWindow(QMainWindow, MainWindow.Ui_MainWindow):
"""Welcome to the class of MainWindow (obviously) """
def __init__(self):
"""Constructor with no legacy of parameter"""
# noinspection PyArgumentList
QMainWindow.__init__(self)
self.setupUi(self)
self.showMaximized()
"""
# for updating date label right on MainWindow
self.lbl_date.setText("Date: " + str(datetime.now().date()) + "\n (YYYY-MM-DD)")
self.lbl_date.setFont(QFont('Arial', 15)) # we have to update a label's font after doing explicit modification on it
self.lbl_buy.setText("Buy: " + str(Entry.total_buy_method()))
self.lbl_buy.setFont(QFont('Arial', 15))
self.lbl_sell.setText("Sell: " + str(Entry.total_sell_method()))
self.lbl_sell.setFont(QFont('Arial', 15))
"""
# declaration of all instance variables
self.add_record_dialog_object = ClassAddRecordDialog()
self.self_object = None # instance variable for showing window again with fresh content
self.delete_record_dialog_object = ClassDeleteRecordDialog()
self.graph_dialog = Window()
# calls of event handlers
self.btn_add_record.clicked.connect(self.pop_up_add_record_dialog)
self.btn_refresh.clicked.connect(self.refresh_record)
self.btn_delete_record.clicked.connect(self.pop_up_delete_record_dialog)
self.btn_statistics.clicked.connect(self.pop_up_statistics_dialog)
# assigned shortcuts to some reputed actions which has high frequency of usage
self.shortcut1 = QtWidgets.QShortcut(QtGui.QKeySequence(QtCore.Qt.Key_R), self)
# noinspection PyUnresolvedReferences
self.shortcut1.activated.connect(self.refresh_record)
self.shortcut2 = QtWidgets.QShortcut(QtGui.QKeySequence(QtCore.Qt.Key_A), self)
# noinspection PyUnresolvedReferences
self.shortcut2.activated.connect(self.pop_up_add_record_dialog)
self.shortcut3 = QtWidgets.QShortcut(QtGui.QKeySequence(QtCore.Qt.Key_D), self)
# noinspection PyUnresolvedReferences
self.shortcut3.activated.connect(self.pop_up_delete_record_dialog)
self.shortcut4 = QtWidgets.QShortcut(QtGui.QKeySequence(QtCore.Qt.Key_S), self)
# noinspection PyUnresolvedReferences
self.shortcut4.activated.connect(self.pop_up_statistics_dialog)
# to count number of rows in Data.csv file in order to write it in tabular form
with open("Data.csv", "r") as file_of_main2:
file_reader = csv.reader(file_of_main2, delimiter=",")
rows = len(list(file_reader)) - 1
# to set number of rows and columns of table
self.tbl_widget_existing_records.setRowCount(rows)
self.tbl_widget_existing_records.setColumnCount(7)
# to set specific column width of table widget (column_index, size)
self.tbl_widget_existing_records.setColumnWidth(0, 70)
self.tbl_widget_existing_records.setColumnWidth(1, 60)
self.tbl_widget_existing_records.setColumnWidth(3, 60) # third column (index2) is by default well-settled
self.tbl_widget_existing_records.setColumnWidth(4, 85)
self.tbl_widget_existing_records.setColumnWidth(5, 85)
self.tbl_widget_existing_records.setColumnWidth(6, 600)
# these are self-explanatory statements
file_of_data = pd.read_csv("Data.csv")
dict_index_to_headers = {0: "Date", 1: "Type", 2: "Product", 3: "Quantity", 4: "Price_Per_Unit",
5: "Total_Price", 6: "Description"}
# to assign column name to @table
self.tbl_widget_existing_records.setHorizontalHeaderLabels(["Date", "Type", "Product Name", "Quantity",
"Price per Unit", "Total Price", "Description"])
# when we want to write content from file to table...
for i in range(rows):
for j in dict_index_to_headers:
self.value = str(file_of_data.at[i, dict_index_to_headers[j]])
self.tbl_widget_existing_records.setItem(i, j, QTableWidgetItem(self.value))
# definitions of event handlers
def refresh_record(self):
"""In order to re-load fresh data of MainWindow into table"""
self.close()
self.self_object = ClassMainWindow() # specified ClassName here because I'm afraid of MaximumRecursiveError
self.self_object.retranslateUi(self.self_object)
self.self_object.showMaximized()
# for updating date label right on MainWindow
self.self_object.lbl_date.setText("Date: " + str(datetime.now().date()) + "\n (YYYY-MM-DD)")
self.self_object.lbl_date.setFont(QFont('Arial', 15)) # we have to update a label's font after doing explicit modification on it
self.self_object.lbl_buy.setText("Buy: " + str(Entry.total_buy_method()))
self.self_object.lbl_buy.setFont(QFont('Arial', 15))
self.self_object.lbl_sell.setText("Sell: " + str(Entry.total_sell_method()))
self.self_object.lbl_sell.setFont(QFont('Arial', 15))