Tkinter delete methode

I’m using Tkinter, I defined the function below to clear entries but it only works for the entries that have default values even when I input new values in these entries it can delete them but it does not clear the entry that doesn’t have default values, Where is the problem, Why entry4 doesn’t get clear?

def clear_text():
    entry1.delete(0, END)
    entry2.delete(0, END)
    entry3.delete(0, END)
    if entry4:
        entry4.delete(0, END)

entry1 = ttk.Entry(left_frame,textvariable=text1)
entry1.insert(0,'1.5')
entry1.grid(row=0, column=1, ipadx=10, padx=0, pady=10)

entry2 = ttk.Entry(left_frame,textvariable=text2)
entry2.insert(0,'2')
entry2.grid(row=1, column=1, ipadx=10, padx=0, pady=10)

entry3 = ttk.Entry(left_frame,textvariable=text3)
entry3.grid(row=2, column=1, ipadx=10, padx=0, pady=10)
entry3.insert(0,'100')

entry4 = ttk.Entry(left_frame, textvariable=text4).grid(row=3, column=1, ipadx=10, padx=0, pady=10)

delete_button = ttk.Button(left_frame, text = "Delete", command=clear_text)
delete_button.grid(row=9, column=0, ipadx=10, padx=0, pady=10)

This is what will happen after I click the Delete button

>Solution :

This line –

entry4 = ttk.Entry(left_frame, textvariable=text4).grid(row=3, column=1, ipadx=10, padx=0, pady=10)

is the problem.

When you define a Tkinter object, it is better to separate the .pack or .grid so that the variable entry4 refers to the tkinter entry object rather than the .grid method which is a nonetype.

Try this –

entry4 = ttk.Entry(left_frame, textvariable=text4)
entry4.grid(row=3, column=1, ipadx=10, padx=0, pady=10)