[Python] Transferring a variable from one function to another

I want to pass the USER_ID variable from one function to another function.

Initial function code:

@app.route('/submit', methods=['POST'])
def log():
data = request.form
login = data['login']
USER_ID = save_ID(login)


Function to which I want to pass a variable 'USER_ID':

@app.route('/save', methods=['POST'])
def save():
json_claster = json_to_dict_list('Data/claster-save.json')
list_user = {
"ID": USER_ID,
"file": request.files['file'],
}
json_claster.append(list_user)

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