tweak travis configuration

.travis.yml

@@ -1,22 +1,17 @@
-group: travis_latest
 language: python
+sudo: required  # required for Python 3.7 (travis-ci/travis-ci#9069)
+dist: xenial    # required for Python 3.7 (travis-ci/travis-ci#9069)
+python: "3.7"
 cache: pip
-matrix:
-  include:
-    - python: 3.7
-      dist: xenial    # required for Python 3.7 (travis-ci/travis-ci#9069)
-      sudo: required  # required for Python 3.7 (travis-ci/travis-ci#9069)
+
 install:
   - pip install --upgrade pip
   - pip install -r requirements.txt
   - pip install flake8
 before_script:
   # stop the build if there are Python syntax errors or undefined names
-  - flake8 . --count --select=E9,F63,F72,F82 --show-source --statistics
+  - flake8 manimlib/ --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
+  - flake8 manimlib/ --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
 script:
   - true  # add other tests here
-notifications:
-  on_success: change
-  on_failure: change  # `always` will be the setting once code changes slow down

manimlib/for_3b1b_videos/common_scenes.py

@@ -257,7 +257,7 @@ def scroll_through_patrons(self):
         self.wait(wait_time)
 
     def modify_patron_name(self, name):
-        if name is "RedAgent14":
+        if name == "RedAgent14":
             return "Brian Shepetofsky"
         return name
 

manimlib/once_useful_constructs/fractals.py

@@ -370,9 +370,9 @@ def get_anchor_points(self):
         curr = np.zeros(3)
         result = [curr]
         for letter in self.get_command_string():
-            if letter is "+":
+            if letter == "+":
                 step = rotate(step, self.angle)
-            elif letter is "-":
+            elif letter == "-":
                 step = rotate(step, -self.angle)
             else:
                 curr = curr + step

manimlib/scene/vector_space_scene.py

@@ -141,7 +141,7 @@ def get_vector_label(self, vector, label,
             angle = vector.get_angle()
             if not rotate:
                 label.rotate(-angle, about_point=ORIGIN)
-            if direction is "left":
+            if direction == "left":
                 label.shift(-label.get_bottom() + 0.1 * UP)
             else:
                 label.shift(-label.get_top() + 0.1 * DOWN)