Python GUI for Reporting Creation

The project is to create a reporting tool GUI in python with basic functionality. The input of the of the script will be one or multiple .txt files or .csv-files which values can be separated by commas, semi-colon, tab, etc. The GUI should allow to read in these files by searching for the files on their computer. Once read-in, the GUI allows the user to visualize the input files and allows to adjust individual numbers, titles, add/delete rows and columns. Furthermore, the users has the optionality to create additional rows and colums which compute minimum, maximum, average and sum. In addition to this, the header is a picture which is also inserted by the user and can be changed. Similarly, the font size and color can be changed. As the input can be multiple or just a single file, the user can choose breaks which part of the input file is put in which page of the report. Lastly, these individual adjustments which are done by the user can be saved by the user in order that they can reuse the once created report in a next iteration but with new data. At the end, the user can create the report which is then saved as a PDF file.
The coding should be documented and be as much as possible in functional-form.