[PyQt] Help with PyQt5

[Alfalfa]

This should get you started. I suggest you edit the .ui file with Qt Designer.
Also you will likely need to read Qt documentation to progress with your project, for now these should be revelant:

https://doc.qt.io/qt-5/qfiledialog.html
https://doc.qt.io/qt-5/qtreewidget.html
https://doc.qt.io/qt-5/qtreewidgetitem.html

---

example.py

#!/usr/bin/python3
import os
import sys
from PyQt5 import QtGui, QtWidgets, QtCore, uic

LOCAL_DIR = os.path.dirname(os.path.realpath(__file__)) + '/'


class Main(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        self.ui = uic.loadUi(LOCAL_DIR + '/gui_main.ui', self)
        self.setWindowTitle("Window tite example")
        self.statusBar().showMessage("Current file: " + self.browsePrompt())
        self.setTreeData()
        self.show()

    def browsePrompt(self):
        browser = QtWidgets.QFileDialog()
        browser.setNameFilter("Spreadsheets (*.xls *.xlsx)")
        if browser.exec_():
            return(browser.selectedFiles()[0])
        return "None"

    def setTreeData(self):
        item = QtWidgets.QTreeWidgetItem()
        item.setText(0, "data 1")
        item.setText(1, "data 2")

        subItem = QtWidgets.QTreeWidgetItem()
        subItem.setText(0, "subdata 1")
        subItem.setText(1, "subdata 2")

        item.addChild(subItem)
        self.ui.treeWidget.addTopLevelItem(item)
        self.ui.treeWidget.expandAll()

def main():
    global app
    app = QtWidgets.QApplication([])
    main = Main()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

gui_main.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
     <widget class="QTreeWidget" name="treeWidget">
      <column>
       <property name="text">
        <string>Column 1</string>
       </property>
      </column>
      <column>
       <property name="text">
        <string>Column 2</string>
       </property>
      </column>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>20</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>