How to get tkinter textbox text after it has been changed?

Is this the proper time to use a global variable? Should I be using stringVar? What can I do to collect the text after the user has changed it's value?

stringVar

When I add a print(my_msg) statement below the my_msg = sms_textbox.get('1.0', 'end-1c') line in the get_txtmsg() function it will print that the text has changed.

print(my_msg)

my_msg = sms_textbox.get('1.0', 'end-1c')

get_txtmsg()

The same print(my_msg) statement within the askfilename_sms() function returns "Hi, how are you?"

print(my_msg)

askfilename_sms()

"Hi, how are you?"

def askfilename_sms():
print(my_msg)

ent3 = ttk.Labelframe(
tab1, text='New Client Survey SMS')
ent3.grid(
row=3, column=0, sticky=tk.NSEW, padx=2, pady=2)

ttk.Label(
ent3, text='This....n').grid(row=0, column=-0)

def get_txtmsg():
global my_msg
my_msg = sms_textbox.get('1.0', 'end-1c')
askfilename_sms()

my_msg = "Hi, how are you?"

sms_btn = ttk.Button(
ent3, text="Send SMS Surveys",
command=lambda: get_txtmsg())
sms_btn.grid(
row=1, column=1, padx=90, pady=10)
sms_textbox = tk.Text(
ent3, height=6, width=34)
sms_textbox.insert(
'1.0', my_msg)
sms_textbox.grid(
row=0, column=1)


EDIT:

So I am not really sure why this works but I put all the functions into one function and now it works(not thrilled but maybe it is the proper way):

def get_txtmsg():
global my_msg
my_msg = sms_textbox.get('1.0', 'end-1c')
sms_msg_box = tk.messagebox.askyesno(
title='Are you ready to begin?',
message='click to send')
if sms_msg_box:
tk.messagebox.showinfo(
message='Please select New Client Report')
sms_nc_filename = filedialog.askopenfilename(
title="Select New Client file",
filetypes=(("excel files", "*.xls"), ("all files", "*.*")))
if not sms_nc_filename:
return
else:
send_sms.send_survey_text(sms_nc_filename, my_msg)

my_msg = "Hi, how are you"

sms_btn = ttk.Button(
ent3, text="Send SMS Surveys",
command=lambda: get_txtmsg())
sms_btn.grid(
row=1, column=1, padx=90, pady=10)
sms_textbox = tk.Text(
ent3, height=6, width=34)
sms_textbox.insert(
'1.0', my_msg)
sms_textbox.grid(
row=0, column=1)


get

print(my_msg)

askfilename_sms()

print(my_msg)

my_msg = sms_textbox.get('1.0', 'end-1c')

get_txtmsg()

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