Use an entry input as a file name Python tkinter - python-3.x

Question

I need to create an excel file then name it using a tkinter textbox, in other words I need to store the tkinter entry getvalue into a variable then assign it as a name to the file that I'll create.
Code:
import tkinter as tk
def show_entry_fields():
print("Nom du rapport global: %s" % (e1.get()))
master = tk.Tk()
tk.Label(master,
text="Nom du rapport global").grid(row=0)
e1 = tk.Entry(master)
e1.grid(row=0, column=1)
tk.Button(master,
text='Quit',
command=master.quit).grid(row=3,
column=1,
sticky=tk.W,
pady=4)
tk.Button(master,
text='Show', command=show_entry_fields).grid(row=3,
column=0,
sticky=tk.W,
pady=4)
import xlsxwriter
workbook = xlsxwriter.Workbook(e1.get()+'.xlsx')
worksheet = workbook.add_worksheet("Rapport global")
worksheet.set_column(1, 1, 25)
worksheet.set_column(1, 2, 25)
worksheet.write('F3', "Hello")
worksheet.write('G3', "world")
workbook.close()
tk.mainloop()
master.withdraw()
It creates an excel file, but with no name, I don't know how to retrieve the input entry and assign it as a file name

Answer 1

I don't have xlsxwriter but I assume that your
workbook = xlsxwriter.Workbook(e1.get()+'.xlsx')
is executed before you set a value in the entry box.
One possible solution would be:
Get the entry value and store it in a variable. To do that I create another button
called but_save. This button calls the method save_entry which get the value of
entry input and stores in a variable.
Run the script, type the desired name and press Save button.
Didn't store variable in a Microsoft Excel file format because I don't have this module
but for simplicity I store it in a text file. You should be able to store it as a xsl as well.
from tkinter import Tk, Label, Entry, Button
class Set_Name():
def __init__(self, master):
self.master = master
self.init_widgets()
def show_entry_fields(self):
print("Nom du rapport global: %s" % (self.e1.get()))
def init_widgets(self):
self.lab_1 = Label(self.master, text="Nom du rapport global")
self.lab_1.grid(row=0)
self.e1 = Entry(self.master)
self.e1.grid(row=0, column=1)
self.but_quit = Button(self.master, text='Quit', command=self.master.quit)
self.but_quit.grid(row=3, column=1, sticky='W', pady=4)
self.but_show = Button(self.master, text='Show', command=self.show_entry_fields)
self.but_show.grid(row=3, column=0, sticky='W', pady=4)
self.but_save = Button(self.master, text="Save", command=self.save_entry)
self.but_save.grid(row=3, column=2)
def save_entry(self):
# I don't have xlsxwriter.
file_name = self.e1.get() # get the string from Entry
with open(file_name, 'w', encoding='utf-8') as f:
f.write("Hello World!") # write whatever you want
if __name__ == "__main__":
root = Tk()
app = Set_Name(root)
root.mainloop()