diff --git a/erpnext/accounts/report/purchase_register/purchase_register.py b/erpnext/accounts/report/purchase_register/purchase_register.py
index 610475a..73bb4dc 100644
--- a/erpnext/accounts/report/purchase_register/purchase_register.py
+++ b/erpnext/accounts/report/purchase_register/purchase_register.py
@@ -179,7 +179,7 @@
 	invoice_tax_map = {}
 	for d in tax_details:
 		if d.account_head in expense_accounts:
-			if invoice_expense_map[d.parent].has_key(d.account_head):
+			if d.account_head in invoice_expense_map[d.parent]:
 				invoice_expense_map[d.parent][d.account_head] += flt(d.tax_amount)
 			else:
 				invoice_expense_map[d.parent][d.account_head] = flt(d.tax_amount)
diff --git a/erpnext/accounts/report/sales_register/sales_register.py b/erpnext/accounts/report/sales_register/sales_register.py
index ace8d54..4debbd6 100644
--- a/erpnext/accounts/report/sales_register/sales_register.py
+++ b/erpnext/accounts/report/sales_register/sales_register.py
@@ -189,7 +189,7 @@
 	invoice_tax_map = {}
 	for d in tax_details:
 		if d.account_head in income_accounts:
-			if invoice_income_map[d.parent].has_key(d.account_head):
+			if d.account_head in invoice_income_map[d.parent]:
 				invoice_income_map[d.parent][d.account_head] += flt(d.tax_amount)
 			else:
 				invoice_income_map[d.parent][d.account_head] = flt(d.tax_amount)
diff --git a/erpnext/manufacturing/doctype/bom/bom.py b/erpnext/manufacturing/doctype/bom/bom.py
index c6463fa..ea33f4e 100644
--- a/erpnext/manufacturing/doctype/bom/bom.py
+++ b/erpnext/manufacturing/doctype/bom/bom.py
@@ -573,7 +573,7 @@
 		items = frappe.db.sql(query, { "qty": qty, "bom": bom }, as_dict=True)
 
 	for item in items:
-		if item_dict.has_key(item.item_code):
+		if item.item_code in item_dict:
 			item_dict[item.item_code]["qty"] += flt(item.qty)
 		else:
 			item_dict[item.item_code] = item
@@ -653,4 +653,4 @@
 				bom_list.append(child_bom)
 		count += 1
 
-	return bom_list
\ No newline at end of file
+	return bom_list
diff --git a/erpnext/stock/doctype/material_request/material_request.py b/erpnext/stock/doctype/material_request/material_request.py
index 9834183..7ddea71 100644
--- a/erpnext/stock/doctype/material_request/material_request.py
+++ b/erpnext/stock/doctype/material_request/material_request.py
@@ -32,10 +32,10 @@
 		so_items = {} # Format --> {'SO/00001': {'Item/001': 120, 'Item/002': 24}}
 		for d in self.get('items'):
 			if d.sales_order:
-				if not so_items.has_key(d.sales_order):
+				if not d.sales_order in so_items:
 					so_items[d.sales_order] = {d.item_code: flt(d.qty)}
 				else:
-					if not so_items[d.sales_order].has_key(d.item_code):
+					if not d.item_code in so_items[d.sales_order]:
 						so_items[d.sales_order][d.item_code] = flt(d.qty)
 					else:
 						so_items[d.sales_order][d.item_code] += flt(d.qty)
diff --git a/erpnext/stock/utils.py b/erpnext/stock/utils.py
index 6f8b2c9..0e9f500 100644
--- a/erpnext/stock/utils.py
+++ b/erpnext/stock/utils.py
@@ -43,7 +43,7 @@
 
 	sle_map = {}
 	for sle in stock_ledger_entries:
-		if not sle_map.has_key((sle.item_code, sle.warehouse)):
+		if not (sle.item_code, sle.warehouse) in sle_map:
 			sle_map[(sle.item_code, sle.warehouse)] = flt(sle.stock_value)
 		
 	return sum(sle_map.values())