try:
with open("data.json", "r") as data_file:
data = json.load(data_file)
except FileNotFoundError:
with open("data.json", "w") as data_file:
json.dump(data, data_file, ident=4)
else:
data.update(new_data)
with open("data.json", "w") as data_file :
json.dump(data, data_file, ident=4)
finally:
website_input.delete(0, END)
password_input.delete(0, END)