Nothing happens when I try to run this program [closed]

I have absolutely zero knowledge of coding, just trying to make this program work but nothing happens i am using python and visual studio code. code is generated by Chat GPT 3. Whenever I try to run the program or open the .py file nothing happens. Please help.

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import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QLineEdit, QVBoxLayout, QHBoxLayout, QPushButton

class ProductCostCalculator(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Product Cost Calculator")
        self.product_costs = {}

        # Create labels and line edits for cost inputs
        self.product_name_label = QLabel("Product Name")
        self.product_name_input = QLineEdit()
        self.cost_price_label = QLabel("Cost Price")
        self.cost_price_input = QLineEdit()
        self.customs_fees_label = QLabel("Customs Fees")
        self.customs_fees_input = QLineEdit()
        self.handling_fees_label = QLabel("Handling Fees")
        self.handling_fees_input = QLineEdit()
        self.other_costs_label = QLabel("Other Costs")
        self.other_costs_input = QLineEdit()
        self.shipping_cost_label = QLabel("Shipping Cost")
        self.shipping_cost_input = QLineEdit()

        # Create "Add Product" button
        self.add_product_button = QPushButton("Add Product")
        self.add_product_button.clicked.connect(self.add_product)

        # Create markup input and label
        self.markup_label = QLabel("Markup Percentage")
        self.markup_input = QLineEdit()
        self.calculate_button = QPushButton("Calculate")
        self.calculate_button.clicked.connect(self.calculate)

        # Create layout for cost inputs
        self.cost_input_layout = QVBoxLayout()
        self.cost_input_layout.addWidget(self.product_name_label)
        self.cost_input_layout.addWidget(self.product_name_input)
        self.cost_input_layout.addWidget(self.cost_price_label)
        self.cost_input_layout.addWidget(self.cost_price_input)
        self.cost_input_layout.addWidget(self.customs_fees_label)
        self.cost_input_layout.addWidget(self.customs_fees_input)
        self.cost_input_layout.addWidget(self.handling_fees_label)
        self.cost_input_layout.addWidget(self.handling_fees_input)
        self.cost_input_layout.addWidget(self.other_costs_label)
        self.cost_input_layout.addWidget(self.other_costs_input)
        self.cost_input_layout.addWidget(self.shipping_cost_label)
        self.cost_input_layout.addWidget(self.shipping_cost_input)
        self.cost_input_layout.addWidget(self.add_product_button)

        # Create layout for markup input
        self.markup_input_layout = QHBoxLayout()
        self.markup_input_layout.addWidget(self.markup_label)
        self.markup_input_layout.addWidget(self.markup_input)
        self.markup_input_layout.addWidget(self.calculate_button)

        # Create main layout and add sub-layouts
        self.main_layout = QVBoxLayout()
        self.main_layout.addLayout(self.cost_input_layout)
        self.main_layout.addLayout(self.markup_input_layout)
        self.setLayout(self.main_layout)

        def add_product(self):
         product_name = self.product_name_input.text()
         cost_price = float(self.cost_price_input.text())
         customs_fees = float(self.customs_fees_input.text())
         handling_fees = float(self.handling_fees_input.text())
         other_costs = float(self.other_costs_input.text())
         shipping_cost = float(self.shipping_cost_input.text())

         total_cost = cost_price + customs_fees + handling_fees + other_costs + shipping_cost
         self.product_costs[product_name] = total_cost

    def calculate(self):
        markup = float(self.markup_input.text())
        for product_name, total_cost in self.product_costs.items():
            gross_profit = (markup / 100) * total_cost
            selling_price = total_cost + gross_profit
            print(f"{product_name}:")
            print(f"Total Cost: ${total_cost}")
            print(f"Gross Profit: ${gross_profit}")
            print(f"Selling Price: ${selling_price}\n")

        if __name__ == '__main__':
         app = QApplication(sys.argv)
        calculator = ProductCostCalculator()
        calculator.show()
        sys.exit(app.exec_())

Trying to make this calculator work since a very long time. Any help at all would be so appreciated

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