askopenfilename tkinter functions and globals

Question

I'm trying to do something to let the users of my company to change their default signature of the email with some personalization.

So I don't understand why when I click this button:

 Button(master, text='Insert  Image',command=insert_image).grid(row=12,column=1,sticky=W,pady=4)

It calls this:

global image_path

def insert_image():
    image_path = filedialog.askopenfilename(initialdir="X:\\", title="Select the image you want to add")
    image_path = 'X:\\' + str(image_path)

It lets me choose the file and it seems to store it in the variable, but later, when I have to use the variable here:

    if image_path != "":
        signature.write('<br><br><img src="{}" alt="prova"><br><br>\n'.format(image_path))

It gives

NameError: name 'image_path' is not defined 

What am I doing wrong?

Answer 1

You need to create your variable in global scope and then use global inside your function.

image_path = ""

def insert_image():
    global image_path
    image_path = filedialog.askopenfilename(...)
    ...