diff --git a/erpnext/accounts/doctype/dunning/test_dunning.py b/erpnext/accounts/doctype/dunning/test_dunning.py
index c5ce514cdd..e2d4d82e41 100644
--- a/erpnext/accounts/doctype/dunning/test_dunning.py
+++ b/erpnext/accounts/doctype/dunning/test_dunning.py
@@ -29,7 +29,7 @@ class TestDunning(unittest.TestCase):
 		self.assertEqual(round(amounts.get('interest_amount'), 2), 0.44)
 		self.assertEqual(round(amounts.get('dunning_amount'), 2), 20.44)
 		self.assertEqual(round(amounts.get('grand_total'), 2), 120.44)
-	
+
 	def test_gl_entries(self):
 		dunning = create_dunning()
 		dunning.submit()
diff --git a/erpnext/accounts/doctype/pricing_rule/pricing_rule.py b/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
index aedf1c6f1a..556f49d34c 100644
--- a/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
+++ b/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
@@ -152,7 +152,7 @@ class PricingRule(Document):
 			frappe.throw(_("Valid from date must be less than valid upto date"))
 
 	def validate_condition(self):
-		if self.condition and ("=" in self.condition) and re.match("""[\w\.:_]+\s*={1}\s*[\w\.@'"]+""", self.condition):
+		if self.condition and ("=" in self.condition) and re.match(r'[\w\.:_]+\s*={1}\s*[\w\.@\'"]+', self.condition):
 			frappe.throw(_("Invalid condition expression"))
 
 #--------------------------------------------------------------------------------
diff --git a/erpnext/assets/doctype/asset/test_asset.py b/erpnext/assets/doctype/asset/test_asset.py
index 30a270c204..3cd4b802c1 100644
--- a/erpnext/assets/doctype/asset/test_asset.py
+++ b/erpnext/assets/doctype/asset/test_asset.py
@@ -566,7 +566,7 @@ class TestAsset(unittest.TestCase):
 		doc = make_invoice(pr.name)
 
 		self.assertEqual('Asset Received But Not Billed - _TC', doc.items[0].expense_account)
-	
+
 	def test_asset_cwip_toggling_cases(self):
 		cwip = frappe.db.get_value("Asset Category", "Computers", "enable_cwip_accounting")
 		name = frappe.db.get_value("Asset Category Account", filters={"parent": "Computers"}, fieldname=["name"])
diff --git a/erpnext/erpnext_integrations/doctype/mpesa_settings/test_mpesa_settings.py b/erpnext/erpnext_integrations/doctype/mpesa_settings/test_mpesa_settings.py
index d370fbcda7..3c2e59ab82 100644
--- a/erpnext/erpnext_integrations/doctype/mpesa_settings/test_mpesa_settings.py
+++ b/erpnext/erpnext_integrations/doctype/mpesa_settings/test_mpesa_settings.py
@@ -81,7 +81,7 @@ class TestMpesaSettings(unittest.TestCase):
 		integration_request.reload()
 		self.assertEqual(pos_invoice.mpesa_receipt_number, "LGR7OWQX0R")
 		self.assertEqual(integration_request.status, "Completed")
-		
+
 		frappe.db.set_value("Customer", "_Test Customer", "default_currency", "")
 		integration_request.delete()
 		pr.reload()
@@ -139,7 +139,7 @@ class TestMpesaSettings(unittest.TestCase):
 		pr.cancel()
 		pr.delete()
 		pos_invoice.delete()
-	
+
 	def test_processing_of_only_one_succes_callback_payload(self):
 		create_mpesa_settings(payment_gateway_name="Payment")
 		mpesa_account = frappe.db.get_value("Payment Gateway Account", {"payment_gateway": 'Mpesa-Payment'}, "payment_account")
diff --git a/erpnext/healthcare/doctype/therapy_plan/test_therapy_plan.py b/erpnext/healthcare/doctype/therapy_plan/test_therapy_plan.py
index d079bedb42..113fa513f9 100644
--- a/erpnext/healthcare/doctype/therapy_plan/test_therapy_plan.py
+++ b/erpnext/healthcare/doctype/therapy_plan/test_therapy_plan.py
@@ -29,7 +29,7 @@ class TestTherapyPlan(unittest.TestCase):
 		self.assertEqual(frappe.db.get_value('Therapy Plan', plan.name, 'status'), 'Completed')
 
 		patient, medical_department, practitioner = create_healthcare_docs()
-		appointment = create_appointment(patient, practitioner, nowdate())		
+		appointment = create_appointment(patient, practitioner, nowdate())
 		session = make_therapy_session(plan.name, plan.patient, 'Basic Rehab', '_Test Company', appointment.name)
 		session = frappe.get_doc(session)
 		session.submit()
diff --git a/erpnext/regional/india/utils.py b/erpnext/regional/india/utils.py
index fc227defbf..075c698fea 100644
--- a/erpnext/regional/india/utils.py
+++ b/erpnext/regional/india/utils.py
@@ -500,7 +500,7 @@ def download_ewb_json():
 
 		if not isinstance(docname, list):
 			# removes characters not allowed in a filename (https://stackoverflow.com/a/38766141/4767738)
-			filename_prefix = re.sub('[^\w_.)( -]', '', docname)
+			filename_prefix = re.sub(r'[^\w_.)( -]', '', docname)
 
 	frappe.local.response.filename = '{0}_e-WayBill_Data_{1}.json'.format(filename_prefix, frappe.utils.random_string(5))