Ошибка: Trailling coma not allowed without surrounding parenthness

У меня нет Visual Studio и PySide2.
У меня установлен PyQt5, но это практически одно и тоже, что и PySide2.

И если заменить

"widght: 70px;\n"
"borders: none;\n"

на

"width: 70px;\n"
"border: none;\n"

и запустить из терминала/CMD python main.py, то вот что получается.

Попробуйте установить свои импорты и запустить из консоли.

main.py

import sys

# PySide2
#from PySide2.QtCore import *
#from PySide2.QtGui import *
#from PySide2.QtWidgets import *

# PyQt5
from PyQt5.Qt import *

# ? from ui import Ui_Form
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        if MainWindow.objectName():
            MainWindow.setObjectName(u"MainWindow")
        MainWindow.resize(370, 426)
        # ? "borders: none;\n"
        # ? "widght: 70px;\n"
        MainWindow.setStyleSheet(u"QPushButton{\n"
"background-color: #737373;\n"
"height: 70px;\n"
"width: 70px;\n"
"font-size: 14 px;\n"
"font-weight: bold;\n"
"text-align: center;\n"
"border: none;\n"                 
"}\n"
"\n"
"QPushButton:hover{\n"
"   background-color: silver;\n"
"}\n"
"\n"
"QPushButton:pressed{\n"
"   background-color:gold;\n"
"}")

        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName(u"centralwidget")
        self.gridLayoutWidget = QWidget(self.centralwidget)
        self.gridLayoutWidget.setObjectName(u"gridLayoutWidget")
        self.gridLayoutWidget.setGeometry(QRect(20, 80, 331, 301))
        self.gridLayout = QGridLayout(self.gridLayoutWidget)
        self.gridLayout.setObjectName(u"gridLayout")
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.pushButton_3 = QPushButton(self.gridLayoutWidget)
        self.pushButton_3.setObjectName(u"pushButton_3")

        self.gridLayout.addWidget(self.pushButton_3, 2, 2, 1, 1)

        self.pushButton_2 = QPushButton(self.gridLayoutWidget)
        self.pushButton_2.setObjectName(u"pushButton_2")

        self.gridLayout.addWidget(self.pushButton_2, 2, 1, 1, 1)

        self.pushButton_6 = QPushButton(self.gridLayoutWidget)
        self.pushButton_6.setObjectName(u"pushButton_6")

        self.gridLayout.addWidget(self.pushButton_6, 1, 2, 1, 1)

        self.pushButton_4 = QPushButton(self.gridLayoutWidget)
        self.pushButton_4.setObjectName(u"pushButton_4")

        self.gridLayout.addWidget(self.pushButton_4, 1, 0, 1, 1)

        self.pushButton_7 = QPushButton(self.gridLayoutWidget)
        self.pushButton_7.setObjectName(u"pushButton_7")

        self.gridLayout.addWidget(self.pushButton_7, 0, 0, 1, 1)

        self.pushButton_8 = QPushButton(self.gridLayoutWidget)
        self.pushButton_8.setObjectName(u"pushButton_8")

        self.gridLayout.addWidget(self.pushButton_8, 0, 1, 1, 1)

        self.pushButton_9 = QPushButton(self.gridLayoutWidget)
        self.pushButton_9.setObjectName(u"pushButton_9")

        self.gridLayout.addWidget(self.pushButton_9, 0, 2, 1, 1)

        self.pushButton_5 = QPushButton(self.gridLayoutWidget)
        self.pushButton_5.setObjectName(u"pushButton_5")

        self.gridLayout.addWidget(self.pushButton_5, 1, 1, 1, 1)

        self.pushButton = QPushButton(self.gridLayoutWidget)
        self.pushButton.setObjectName(u"pushButton")

        self.gridLayout.addWidget(self.pushButton, 2, 0, 1, 1)

        self.pushButton_10 = QPushButton(self.gridLayoutWidget)
        self.pushButton_10.setObjectName(u"pushButton_10")

        self.gridLayout.addWidget(self.pushButton_10, 3, 1, 1, 1)

        self.verticalLayoutWidget = QWidget(self.centralwidget)
### +++       
        self.verticalLayoutWidget.setStyleSheet('background-color: #99f;')

        self.verticalLayoutWidget.setObjectName(u"verticalLayoutWidget")
        self.verticalLayoutWidget.setGeometry(QRect(19, 9, 331, 61))
        self.verticalLayout = QVBoxLayout(self.verticalLayoutWidget)
        self.verticalLayout.setObjectName(u"verticalLayout")
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)

        MainWindow.setCentralWidget(self.centralwidget)

        self.statusbar = QStatusBar(MainWindow)
        self.statusbar.setObjectName(u"statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)

        QMetaObject.connectSlotsByName(MainWindow)
    # setupUi

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"MainWindow", None))
        self.pushButton_3.setText(QCoreApplication.translate("MainWindow", u"9", None))
        self.pushButton_2.setText(QCoreApplication.translate("MainWindow", u"8", None))
        self.pushButton_6.setText(QCoreApplication.translate("MainWindow", u"6", None))
        self.pushButton_4.setText(QCoreApplication.translate("MainWindow", u"4", None))
        self.pushButton_7.setText(QCoreApplication.translate("MainWindow", u"1", None))
        self.pushButton_8.setText(QCoreApplication.translate("MainWindow", u"2", None))
        self.pushButton_9.setText(QCoreApplication.translate("MainWindow", u"3", None))
        self.pushButton_5.setText(QCoreApplication.translate("MainWindow", u"5", None))
        self.pushButton.setText(QCoreApplication.translate("MainWindow", u"7", None))
        self.pushButton_10.setText(QCoreApplication.translate("MainWindow", u"0", None))
    # retranslateUi


class MainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)

        self.setupUi(self)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec())

Уберите запятую в конце строки импорта:

from PySide2.QtGui import QFontDatabase, QIcon, QLinearGradient, QPalette, QPainter, QPixmap,

т.е.

from PySide2.QtGui import QFontDatabase, QIcon, QLinearGradient, QPalette, QPainter, QPixmap

Или добавив скобки:

from PySide2.QtGui import (QFontDatabase, QIcon, QLinearGradient, QPalette, QPainter, QPixmap,)