print_mapper_dict.py

import webnotes, json

webnotes.connect()

source = "Quotation"
target = "Sales Order"

doclist = webnotes.bean("DocType Mapper", "Quotation-Sales Order").doclist

map_id = {}
table_map = {}
for d in doclist.get({"doctype": "Table Mapper Detail"}):
  map_id[d.match_id] = {"from": d.from_table, "to": d.to_table}
	table_map[d.from_table] = {
		"doctype": d.to_table,
		"field_map": {}
	}
		
for d in doclist.get({"doctype": "Field Mapper Detail"}):
	table_map[map_id[d.match_id]["from"]]["field_map"][d.from_field] = d.to_field
	
print json.dumps(table_map, indent=4, sort_keys=True)