diff --git a/.travis.yml b/.travis.yml
index 5fba6987bb66..2440899e4f25 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ install:
     - pip install flake8  # pytest  # add another testing frameworks later
 before_script:
     # stop the build if there are Python syntax errors or undefined names
-    - flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
+    - flake8 . --count --select=E9,F63,F72,F82 --show-source --statistics
     # exit-zero treats all errors as warnings.  The GitHub editor is 127 chars wide
     - flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
 script:
diff --git a/project_euler/problem_17/sol1.py b/project_euler/problem_17/sol1.py
index 9de5d80b9b29..8dd6f1af2093 100644
--- a/project_euler/problem_17/sol1.py
+++ b/project_euler/problem_17/sol1.py
@@ -22,7 +22,7 @@
 		if i >= 100:
 			count += ones_counts[i/100] + 7 #add number of letters for "n hundred"
 
-			if i%100 is not 0:
+			if i%100 != 0:
 				count += 3 #add number of letters for "and" if number is not multiple of 100
 
 		if 0 < i%100 < 20:
@@ -32,4 +32,4 @@
 	else:
 		count += ones_counts[i/1000] + 8
 
-print(count)
\ No newline at end of file
+print(count)
diff --git a/project_euler/problem_19/sol1.py b/project_euler/problem_19/sol1.py
index 94cf117026a4..13e520ca76e4 100644
--- a/project_euler/problem_19/sol1.py
+++ b/project_euler/problem_19/sol1.py
@@ -30,10 +30,10 @@
 	day += 7
 
 	if (year%4 == 0 and not year%100 == 0) or (year%400 == 0):
-		if day > days_per_month[month-1] and month is not 2:
+		if day > days_per_month[month-1] and month != 2:
 			month += 1
 			day = day-days_per_month[month-2]
-		elif day > 29 and month is 2:
+		elif day > 29 and month == 2:
 			month += 1
 			day = day-29
 	else:
@@ -45,7 +45,7 @@
 		year += 1
 		month = 1
 
-	if year < 2001 and day is 1:
+	if year < 2001 and day == 1:
 		sundays += 1
 
-print(sundays)
\ No newline at end of file
+print(sundays)