Python error: xlsxwriter.exceptions.FileCreateError: [Errno 2] No such file or directory: ''

Question

What I am trying to do :

I am trying to save a file using filedialog. The saving part works well but if I click cancel on the dialog box choosing not to save, I get this error. How can this error be removed?

Error I am getting:

Exception in Tkinter callback

FileNotFoundError: [Errno 2] No such file or directory: ''

During handling of the above exception, another exception occurred:


xlsxwriter.exceptions.FileCreateError: [Errno 2] No such file or directory: ''

Below is my code :

import xlsxwriter
import tkinter as tk
import tkinter.ttk as ttk
from tkinter import filedialog

def save():
    filename = filedialog.asksaveasfilename(filetypes=[("Excel files", ".xlsx .xls")],defaultextension='.xlsx')
    workbook = xlsxwriter.Workbook(filename)
    worksheet = workbook.add_worksheet()
    worksheet.write('A1', 'Common Information') 
    worksheet.write('A2', 'Circumference of Tank')
    worksheet.write('C2', 'Height of Tank')
    worksheet.write('A3', 'Minimum Thickness of Tank')
    worksheet.write('C3', 'Maximum Thickness of Tank')   

    workbook.close()  

window = tk.Tk()
window.configure(background='white')

ws = window.winfo_screenwidth()
hs = window.winfo_screenheight()
w = 700 # width for the Tk root
h = 585  # height for the Tk root
x = (ws / 2) - (w / 2)
y = (hs / 2) - (h / 2)

window.geometry('%dx%d+%d+%d' % (w, h, x, y))   

canvas = tk.Canvas(window,bg="white",width=700, height=585, highlightthickness=0)
canvas.pack()


save1 = ttk.Button(canvas, text='Save', command= lambda: save())
canvas.create_window(15, 15, window=save1, anchor=tk.NW)


window.resizable(False, False)
window.mainloop()

Answer 1

Your save function will be called after you press the button.

filename = filedialog.asksaveasfilename(filetypes=[("Excel files", ".xlsx .xls")],defaultextension='.xlsx')
....

Because when you stop selecting the path,the filename will be (it is a str type but its length == 0 ).And workbook = xlsxwriter.Workbook(filename) will raise Exception.

So you should use a if statement before you save your xlsx file.

And the save() function should be:

def save():
    filename = filedialog.asksaveasfilename(filetypes=[("Excel files", ".xlsx .xls")],defaultextension='.xlsx')
    if filename:
        workbook = xlsxwriter.Workbook(filename)
        worksheet = workbook.add_worksheet()
        worksheet.write('A1', 'Common Information')
        worksheet.write('A2', 'Circumference of Tank')
        worksheet.write('C2', 'Height of Tank')
        worksheet.write('A3', 'Minimum Thickness of Tank')
        worksheet.write('C3', 'Maximum Thickness of Tank')

        workbook.close()