Need help to display data from a file

[Dzib]

Hi,

I'm new to Python and trying to code my first little app, I have difficulties reading data from a file.
The goal of the app is that the user enter data corresponding to a person in a GUI (Last Name, First Name, Rank and Service). These data are stored as a list in a json file.
I would like then the data to be displayed in a treeview, each item of the list in its own column, and that's where I'm stuck.
Here's my code:
If you have advices regarding the code or the way to store (json? sqlite? list? dict?...) they're more than welcome

from tkinter import *
from tkinter import ttk
import json

window=Tk()
window.title("Add Record")
window.geometry("720x500")
tree=ttk.Treeview(window, columns=("Last Name", "First Name", "Rank", "Service"))
tree.grid(column=0, row=4, columnspan=4, pady=5)
tree.column("#0", width=0, minwidth=0)
tree.column("#1", width=200)
tree.column("#2", width=200)
tree.column("#3", width=80)
tree.column("#4", width=150)
tree.heading("#1",text="Last Name")
tree.heading("#2",text="First Name")
tree.heading("#3",text="Rank")
tree.heading("#4",text="Service")

def Quit():
    window.destroy()
    
def AddRecord():
    CRUMember=[txtLastName.get(), txtFirstName.get(), txtRank.get(), txtService.get()]
    with open("CRUMembers.json", "a") as file:
        json.dump(CRUMember, file)
        file.write("\n")
        txtLastName.delete(0, END)
        txtFirstName.delete(0, END)
        txtRank.delete(0, END)
        txtService.delete(0, END)
        txtLastName.focus()
        
def DispRecord():
    with open("CRUMembers.json") as file:
        for line in file:
            line=line.strip()
            CRUMember=file.readlines()
            for p in range(len(CRUMember)):
                tree.insert("", "end", values=(CRUMember[p], CRUMember[p+1], CRUMember[p+2], CRUMember[p+3]))

lblLastName=Label(window, text="Last Name", font=("Calibri", "14"))
lblLastName.grid(column=0, row=0, sticky=E, ipadx=5, padx=10, pady=5)
lblFirstName=Label(window, text="First Name", font=("Calibri", "14"))
lblFirstName.grid(column=0, row=1, sticky=E, ipadx=5, padx=10, pady=5)
lblRank=Label(window, text="Rank", font=("Calibri", "14"))
lblRank.grid(column=0, row=2, sticky=E, ipadx=5, padx=10, pady=10)
lblService=Label(window, text="Service", font=("Calibri", "14"))
lblService.grid(column=0, row=3, sticky=E, ipadx=5, padx=10, pady=10)

txtLastName=Entry(window, width=30, font=("Calibri", "14"))
txtLastName.grid(column=1, row=0)
txtFirstName=Entry(window, width=30, font=("Calibri", "14"))
txtFirstName.grid(column=1, row=1)
txtRank=Entry(window, width=30, font=("Calibri", "14"))
txtRank.grid(column=1, row=2)
txtService=Entry(window, width=30, font=("Calibri", "14"))
txtService.grid(column=1, row=3)
txtLastName.focus()

btnAddRecord=Button(window, text="Add Record", command=AddRecord, font=("Calibri", "14"), width=12)
btnAddRecord.grid(column=2, row=0, padx=10, pady=5)
btnDispRecord=Button(window, text="Display Records", command=DispRecord, font=("Calibri", "14"), width=12)
btnDispRecord.grid(column=3, row=0, pady=5, sticky=E)
btnQuit=Button(window, text="Quit", command=Quit, font=("Calibri", "14"))
btnQuit.grid(column=3, row=5, pady=5, sticky=SE)

window.mainloop()