What is a good way in Odoo 16 to format currency or money in a Python module?

Question

I have a module where I am trying to present the user with a friendly error message. Is there a way to do this in Odoo?

# Check if the order value matches the Easy Credit order value
ecOrderValue = client.response.json().get('orderDetails').get('originalOrderValue')
if ecOrderValue != self.sale_order.amount_total:
    errors.append((_('EasyCredit and order total mismatched! EasyCredit: %s - Order: %s') % (
        ecOrderValue, self.sale_order.amount_total)))

I tried locale and Monetary but locale just shows an error saying C is not a valid locale. Monetary converts to HTML but I just want a string.