TKINTER: Read file if entries match stored data? - python-3.x

Question

I am new to python, I am trying to create a button function that can both write new data to file and if written data matches then fetch load the data from profile.
The issue I face is here:
line 12: if firstname_info in list_of_files:
code does not run the if statement of the loop - maybe I have made an error with the variable matching the file?
Code:
from tkinter import *
import tkinter.messagebox
import os
def register_user():
firstname_info = firstname.get()
lastname_info = lastname.get()
iden_info = iden.get()
email_info = email.get()
list_of_files = os.listdir()
if firstname_info in list_of_files:
file1 = open(firstname_info, "r")
verify = file1.read().splitlines()
if lastname_info in verify:
if iden_info in verify:
if email_info in verify:
print("it worked")
else:
print("user not found")
def main_screen():
global screen
screen = Tk()
global firstname
global lastname
global iden
global email
firstname = StringVar()
lastname = StringVar()
iden = StringVar()
email = StringVar()
header = Label(text = "Header")
firstname_label = Label(text = "Firstname")
lastname_label = Label(text = "lastname")
iden_label = Label(text = "Student ID")
email_label = Label(text = "Student Email")
header.grid(row=0, column=1)
firstname_label.grid(row=1, column=0)
lastname_label.grid(row=2, column=0)
iden_label.grid(row=3, column=0)
email_label.grid(row=4, column=0)
b1 = Button(text = "Submit", command = register_user)
b1.grid(row = 5, column = 1)
global firstname_entry
global lastname_entry
global iden_entry
global email_entry
firstname_entry = Entry(textvariable = firstname)
firstname_entry.grid(row = 1, column = 1)
lastname_entry = Entry(textvariable = lastname)
lastname_entry.grid(row = 2, column = 1)
iden_entry = Entry(textvariable = iden)
iden_entry.grid(row = 3, column = 1)
email_entry = Entry(textvariable = email)
email_entry.grid(row = 4, column = 1)
screen.mainloop()
main_screen()
thanks

Answer 1

If you run your script in the same directory of the stored data, it should work as os.listdir() will search file in . directory which is current directory. However, it is better to specify the directory of the stored data in os.listdir(), like os.listdir('/path/to/stored/data'). Also, I think the following block of code:
if firstname_info in list_of_files:
file1 = open(firstname_info, "r")
verify = file1.read().splitlines()
if lastname_info in verify:
if iden_info in verify:
if email_info in verify:
print("it worked")
else:
print("user not found")
should be changed to:
if firstname_info in list_of_files:
print('user profile found')
with open(firstname_info, "r") as file1:
verify = file1.read().splitlines()
if lastname_info in verify and iden_info in verify and email_info in verify:
print("it worked")
else:
print("user info incorrect")
else:
print("user profile not found")

Answer 2

You are not writing the data from the GUI to any files.
Before reading from file which is firstname_info you should create it first.
you can modify your register_user() function as below code
def register_user():
firstname_info = firstname.get()
lastname_info = lastname.get()
iden_info = iden.get()
email_info = email.get()
list_of_files = os.listdir()
if firstname_info in list_of_files:
file1 = open(firstname_info, "r")
verify = file1.read().splitlines()
if lastname_info in verify:
if iden_info in verify:
if email_info in verify:
print("it worked")
else:
print("user not found")
else:
file1 = open(firstname_info, "w")
file1.write(lastname_info+"\n"+iden_info+"\n"+email_info)
file1.close()