How to print the collect and print in erpnext desk

import frappe
from frappe.model.document import Document
def get_data(document, method):
doc = frappe.get_doc("Opportunity","OPTY-00003")
frappe.msgprint("Test doc"+doc.name)
frappe.msgprint("Customer name is "+doc.customer)
frappe.msgprint("status is "+doc.status)
comments = frappe.get_list('Communication', fields=['content', 'user'], filters={'reference_name': doc.name})
for com in comments :
frappe.msgprint(com.user)
frappe.msgprint(com.content)
frappe.msgprint("comments over")