STYLE: Fixing and refactoring linting

.pep8speaks.yml

@@ -3,9 +3,18 @@
 scanner:
     diff_only: True  # If True, errors caused by only the patch are shown
 
+# Opened issue in pep8speaks, so we can directly use the config in setup.cfg
+# (and avoid having to duplicate it here):
+# https://github.com/OrkoHunter/pep8speaks/issues/95
+
 pycodestyle:
     max-line-length: 79
-    ignore:  # Errors and warnings to ignore
+    ignore:
+        - W503,  # line break before binary operator
         - E402,  # module level import not at top of file
+        - E722,  # do not use bare except
         - E731,  # do not assign a lambda expression, use a def
-        - W503   # line break before binary operator
+        - E741,  # ambiguous variable name 'l'
+        - C406,  # Unnecessary list literal - rewrite as a dict literal.
+        - C408,  # Unnecessary dict call - rewrite as a literal.
+        - C409   # Unnecessary list passed to tuple() - rewrite as a tuple literal.

.travis.yml

@@ -45,14 +45,14 @@ matrix:
           - language-pack-zh-hans
     - dist: trusty
       env:
-        - JOB="2.7, lint" ENV_FILE="ci/travis-27.yaml" TEST_ARGS="--skip-slow" LINT=true
+        - JOB="2.7" ENV_FILE="ci/travis-27.yaml" TEST_ARGS="--skip-slow"
       addons:
         apt:
           packages:
           - python-gtk2
     - dist: trusty
       env:
-        - JOB="3.6, coverage" ENV_FILE="ci/travis-36.yaml" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate" COVERAGE=true DOCTEST=true
+        - JOB="3.6, lint, coverage" ENV_FILE="ci/travis-36.yaml" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate" COVERAGE=true LINT=true
     # In allow_failures
     - dist: trusty
       env:
@@ -115,10 +115,6 @@ script:
   - ci/script_single.sh
   - ci/script_multi.sh
   - ci/lint.sh
-  - ci/doctests.sh
-  - echo "checking imports"
-  - source activate pandas && python ci/check_imports.py
-  - echo "script done"
 
 after_success:
   -  ci/upload_coverage.sh