Fix tests for file_transfer and perceptron.py

.travis.yml

@@ -4,44 +4,13 @@ python: 3.7
 cache: pip
 before_install: pip install --upgrade pip setuptools
 install: pip install -r requirements.txt
-matrix:
-  include:
-    - name: "Main tests"
-    # The following files currently fail pytests.  See issues: #1016, #1044, #1080
-    # Here they are run allow_failures mode and when each passes pytest, it can be
-    # removed BOTH lists below.  Complex now but simple once all files pass pytest.
-    # - env: FILE=pytest file_transfer_protocol/ftp_client_server.py
-    #   before_script: true
-    #   script: pytest ${FILE} --doctest-modules
-    - env: FILE=pytest file_transfer/ftp_send_receive.py
-      before_script: true
-      script: pytest ${FILE} --doctest-modules
-    - env: FILE=pytest machine_learning/linear_regression.py
-      before_script: true
-      script: pytest ${FILE} --doctest-modules
-    - env: FILE=pytest machine_learning/perceptron.py
-      before_script: true
-      script: pytest ${FILE} --doctest-modules
-    - env: FILE=pytest machine_learning/random_forest_classification/random_forest_classification.py
-      before_script: true
-      script: pytest ${FILE} --doctest-modules
-    - env: FILE=pytest machine_learning/random_forest_regression/random_forest_regression.py
-      before_script: true
-      script: pytest ${FILE} --doctest-modules
-  allow_failures:
-    - before_script: true
 before_script:
   - black --check . || true
   - flake8 . --count --select=E9,F401,F63,F7,F82 --show-source --statistics
 script:
   - scripts/validate_filenames.py  # no uppercase, no spaces, in a directory
   - mypy --ignore-missing-imports .
   - pytest . --doctest-modules
-      --ignore=file_transfer/ftp_send_receive.py
-      --ignore=machine_learning/linear_regression.py
-      --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
 after_success:
   - scripts/build_directory_md.py > DIRECTORY.md
   - cat DIRECTORY.md