Travis CI: Run each failing pytest in || true mode

Author: cclauss

.travis.yml

@@ -19,6 +19,16 @@ script:
       --ignore=machine_learning/perceptron.py
       --ignore=machine_learning/random_forest_classification/random_forest_classification.py
       --ignore=machine_learning/random_forest_regression/random_forest_regression.py
+  # The following files currently fail pytests.  See issues: #1016, #1044, #1080
+  # Here they are run || true and when each passes pytest, it can be removed above and below.
+  - pytest data_structures/stacks/balanced_parentheses.py --doctest-modules || true
+  - pytest data_structures/stacks/infix_to_postfix_conversion.py --doctest-modules || true
+  - pytest file_transfer_protocol/ftp_send_receive.py --doctest-modules || true
+  - pytest file_transfer_protocol/ftp_client_server.py --doctest-modules || true
+  - pytest machine_learning/linear_regression.py --doctest-modules || true
+  - pytest machine_learning/random_forest_classification/random_forest_classification.py --doctest-modules || true
+  - pytest machine_learning/random_forest_regression/random_forest_regression.py --doctest-modules || true
+
 after_success:
   - scripts/build_directory_md.py > DIRECTORY.md
   - cat DIRECTORY.md