Ps：水平有限，欢迎建议和挑错

根据上章读者留言，补充完整的QTableWidget
中间耽误太久的时间，实在不好意思。
完整代码如下：

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
import pandas as pd
import numpy as np


class Ui_MainWindow(QMainWindow):

    def __init__(self):
        super(QtWidgets.QMainWindow,self).__init__()
        self.setupUi(self)
        self.retranslateUi(self)

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(666, 488)
        self.centralWidget = QtWidgets.QWidget(MainWindow)
        self.centralWidget.setObjectName("centralWidget")
        self.retranslateUi(MainWindow)

        self.tableWidget = QtWidgets.QTableWidget(self.centralWidget)
        self.tableWidget.setGeometry(QtCore.QRect(0, 60, 813, 371))
        self.tableWidget.setObjectName("tableWidget")
        self.tableWidget.setColumnCount(0)
        self.tableWidget.setRowCount(0)
        self.tableWidget.setStyleSheet("selection-background-color:pink")
        self.tableWidget.setEditTriggers(QAbstractItemView.NoEditTriggers)
        self.tableWidget.raise_()

        self.pushButton = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton.setGeometry(QtCore.QRect(90, 20, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.pushButton.setText("打开")
        MainWindow.setCentralWidget(self.centralWidget)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

        self.pushButton.clicked.connect(self.openfile)
        self.pushButton.clicked.connect(self.creat_table_show)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "一颗数据小白菜"))


    def openfile(self):

        ###获取路径===================================================================

        openfile_name = QFileDialog.getOpenFileName(self,'选择文件','','Excel files(*.xlsx , *.xls)')

        #print(openfile_name)
        global path_openfile_name


        ###获取路径====================================================================

        path_openfile_name = openfile_name[0]


    def creat_table_show(self):
        ###===========读取表格，转换表格，===========================================
        if len(path_openfile_name) > 0:
            input_table = pd.read_excel(path_openfile_name)
        #print(input_table)
            input_table_rows = input_table.shape[0]
            input_table_colunms = input_table.shape[1]
        #print(input_table_rows)
        #print(input_table_colunms)
            input_table_header = input_table.columns.values.tolist()
        #print(input_table_header)

        ###===========读取表格，转换表格，============================================
        ###======================给tablewidget设置行列表头============================

            self.tableWidget.setColumnCount(input_table_colunms)
            self.tableWidget.setRowCount(input_table_rows)
            self.tableWidget.setHorizontalHeaderLabels(input_table_header)

        ###======================给tablewidget设置行列表头============================

        ###================遍历表格每个元素，同时添加到tablewidget中========================
            for i in range(input_table_rows):
                input_table_rows_values = input_table.iloc[[i]]
                #print(input_table_rows_values)
                input_table_rows_values_array = np.array(input_table_rows_values)
                input_table_rows_values_list = input_table_rows_values_array.tolist()[0]
            #print(input_table_rows_values_list)
                for j in range(input_table_colunms):
                    input_table_items_list = input_table_rows_values_list[j]
                #print(input_table_items_list)
                # print(type(input_table_items_list))

        ###==============将遍历的元素添加到tablewidget中并显示=======================

                    input_table_items = str(input_table_items_list)
                    newItem = QTableWidgetItem(input_table_items) 
                    newItem.setTextAlignment(Qt.AlignHCenter|Qt.AlignVCenter)
                    self.tableWidget.setItem(i, j, newItem)  

        ###================遍历表格每个元素，同时添加到tablewidget中========================
        else:
            self.centralWidget.show()

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

效果如图：

1.gif