How to add multiple entries in tkinter? - python-3.x

Question

I am extremely new to Tkinter. I have been trying to create something that basically calculates the average of the marks inputted. I am trying to give the user the option to choose the number of subjects, and accordingly create that many entries.
from tkinter import *
root = Tk()
x, y, d = 0, 0, {}
for i in range(1, int(input('Enter no of subjects')) + 1):
sub1 = Entry(root, width=15, borderwidth=5)
sub1.grid(row=x, column=y)
max1 = Entry(root, width=15, borderwidth=5)
max1.grid(row=x, column=y+2)
sub1label = Label(root, text='Marks attained', bg='grey', fg='white')
sub1label.grid(row=x, column=y+1)
max_sub1label = Label(root, text='Max Marks', bg='grey', fg='white')
max_sub1label.grid(row=x, column=y+3)
x += 1
root.mainloop()
Is there a way to store the data inputted each time so as to compute the percentage acquired? Or is there another method I can use?

Answer 1

You can store the values in the list and then index the list later on with the required value and get the items you wants. Here is your corrected code:
from tkinter import *
root = Tk()
def show():
for i in range(tot_sub): # Loop through the number of subjects
attained = attained_marks[i].get() # Get the indexed item from the list and use get()
max_mark = max_marks[i].get()
print(f'Attained marks: {attained}, Max marks: {max_mark}') # Print the values out
attained_marks = [] # Empty list to populate later
max_marks = [] # Empty list to populate later
tot_sub = int(input('Enter no. of subjects: ')) # Number of subjects
for i in range(tot_sub):
sub1 = Entry(root, width=15, borderwidth=5)
sub1.grid(row=i, column=0)
attained_marks.append(sub1) # Append each entry to the list
max1 = Entry(root, width=15, borderwidth=5)
max1.grid(row=i, column=2)
max_marks.append(sub1) # Append each entry to the list
sub1label = Label(root, text='Marks attained', bg='grey', fg='white')
sub1label.grid(row=i, column=1, padx=5)
max_sub1label = Label(root, text='Max Marks', bg='grey', fg='white')
max_sub1label.grid(row=i, column=3, padx=5)
root.bind('<Return>',lambda e: show()) # For demonstration of getting all the data
root.mainloop()
I have also changed the loop a bit as you don't need to initialize x,y,d and so on, as it can be easily achieved from inside the loop itself. I have also expanded the code so you can understand easily. Also I dont recommend using input() as it is for the terminal, use an Entry instead.
Alternatively: You can also use a dict and avoid the use of 2 lists, the dictionary would be something like {'Alternative Marks':[att1,att2,...],'Maximum Mark':[max1,max2,...]}, but this would make looping through and indexing a bit more lengthy.