global var in def

[Dotparsed]

I have text form e and button wich save value of this form to global var

button_add = Button(root, text="+", command=button_add)

Can you explain, why this code work

def button_add():
    first_number = e.get()
    global f_num
    f_num = int(first_number)

But this not

def button_add():
    global f_num = int(e.get())

Error:

Error:
    global f_num = int(e.get())
                 ^
SyntaxError: invalid syntax

For me they are same, but not(
Thanks!

[ibreeden]

Look at the definition: 7.12. The global statement. The definition allows to declare a variable as global, but not to assign a value to it. So you must do that in two lines.

[DeaD_EyE]

https://docs.python.org/3/reference/simp...-statement