HDF5 store added to application does not keep data after closing application

Question

I have an application, which uses a HDF5-file to store dataframes. I included the file with PyInstaller into the application. When I run the application I can save data to the store. I can access the data as long as the program is running. But after closing the application all data, which I have stored in the HDF5-file is gone.

A minimal example, which produces this, is:

from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
import pandas as pd
import sys, os
import h5py

class MyApp(QMainWindow):
    def __init__(self):
        super().__init__()
        self.window_width, self.window_height = 200, 200
        self.setMinimumSize(self.window_width, self.window_height)
        self.button = QPushButton("Save", self)
        self.button.move(0, 50)
        self.button.clicked.connect(self.save)
        self.button = QPushButton("Load", self)
        self.button.move(0, 100)
        self.button.clicked.connect(self.load)
        self.button = QPushButton("Delete", self)
        self.button.move(0, 150)
        self.button.clicked.connect(self.delete)
        self.df = pd.DataFrame(data = [1, 2, 3])

    def load(self):
        h5File = self.resource_path("test.h5")
        self.df = pd.read_hdf(h5File, "data")
        print(self.df)

    def save(self):
        h5File = self.resource_path("test.h5")
        frame = [self.df, self.df]
        self.df = pd.concat(frame)
        self.df.to_hdf(h5File, "data")

    def delete(self):
        h5File = self.resource_path("test.h5")
        with h5py.File(h5File, 'r+') as store:
            del store["data"]
        self.df = pd.DataFrame(data = [1, 2, 3])

    def resource_path(self, relative_path):
        """ Get absolute path to resource, works for dev and for PyInstaller """

        try:
         # PyInstaller creates a temp folder and stores path in _MEIPASS
            base_path = sys._MEIPASS
        except Exception:
            base_path = os.path.abspath(".")

        return os.path.join(base_path, relative_path)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    myapp = MyApp()
    myapp.show()

    try:
        sys.exit(app.exec_())
    except SystemExit:
        print('Closing Window...')

I can save df in the store and then load it too. When I close the program, however, the memory is empty again.

The spec-file, which I use with PyInstaller is:

block_cipher = None


a = Analysis(['test.py'],
             pathex=['C:\\Users\\mazze\\PycharmProjects\\LawRefrences\\test8.py'],
             binaries=[],
             datas=[],
             hiddenimports=[],
             hookspath=[],
             runtime_hooks=[],
             excludes=[],
             win_no_prefer_redirects=False,
             win_private_assemblies=False,
             cipher=block_cipher,
             noarchive=False)
pyz = PYZ(a.pure, a.zipped_data,
             cipher=block_cipher)

a.datas += [("test.h5","C:\\Users\\mazze\\PycharmProjects\\LawRefrencer\\test.h5", "DATA")]

exe = EXE(pyz,
          a.scripts,
          a.binaries,
          a.zipfiles,
          a.datas,
          [],
          name='test8',
          debug=False,
          bootloader_ignore_signals=False,
          strip=False,
          upx=True,
          upx_exclude=[],
          runtime_tmpdir=None,
          console=True )