diff --git a/erpnext/accounts/report/financial_statements.py b/erpnext/accounts/report/financial_statements.py
index 5d2a35b..da8214a 100644
--- a/erpnext/accounts/report/financial_statements.py
+++ b/erpnext/accounts/report/financial_statements.py
@@ -5,6 +5,8 @@
 
 import re
 
+import functools
+
 import frappe
 from erpnext.accounts.report.utils import get_currency, convert_to_presentation_currency
 from erpnext.accounts.utils import get_fiscal_year
@@ -325,7 +327,7 @@
 			return -1
 		return 1
 
-	roots.sort(compare_roots)
+	roots.sort(key = functools.cmp_to_key(compare_roots))
 
 
 def set_gl_entries_by_account(
diff --git a/erpnext/manufacturing/doctype/bom/bom.py b/erpnext/manufacturing/doctype/bom/bom.py
index 953b4bc..4785312 100644
--- a/erpnext/manufacturing/doctype/bom/bom.py
+++ b/erpnext/manufacturing/doctype/bom/bom.py
@@ -9,6 +9,8 @@
 from frappe.website.website_generator import WebsiteGenerator
 from erpnext.stock.get_item_details import get_conversion_factor
 
+import functools
+
 from six import string_types
 
 from operator import itemgetter
@@ -585,7 +587,7 @@
 @frappe.whitelist()
 def get_bom_items(bom, company, qty=1, fetch_exploded=1):
 	items = get_bom_items_as_dict(bom, company, qty, fetch_exploded).values()
-	items.sort(lambda a, b: a.item_code > b.item_code and 1 or -1)
+	items.sort(key = functools.cmp_to_key(lambda a, b: a.item_code > b.item_code and 1 or -1))
 	return items
 
 def validate_bom_no(item, bom_no):