[SPARK-9385] [PYSPARK] Enable PEP8 but disable installing pylint.

Instead of disabling all python style check, we should enable PEP8. So, this PR just comments out the part installing pylint.

Author: Yin Huai <[email protected]>

Closes apache#7704 from yhuai/SPARK-9385 and squashes the following commits:

0056359 [Yin Huai] Enable PEP8 but disable installing pylint.

Author: yhuai

dev/lint-python

@@ -58,21 +58,21 @@ export "PYTHONPATH=$SPARK_ROOT_DIR/dev/pylint"
 export "PYLINT_HOME=$PYTHONPATH"
 export "PATH=$PYTHONPATH:$PATH"
 
-if [ ! -d "$PYLINT_HOME" ]; then
-    mkdir "$PYLINT_HOME"
-    # Redirect the annoying pylint installation output.
-    easy_install -d "$PYLINT_HOME" pylint==1.4.4 &>> "$PYLINT_INSTALL_INFO"
-    easy_install_status="$?"
-
-    if [ "$easy_install_status" -ne 0 ]; then
-        echo "Unable to install pylint locally in \"$PYTHONPATH\"."
-        cat "$PYLINT_INSTALL_INFO"
-        exit "$easy_install_status"
-    fi
-
-    rm "$PYLINT_INSTALL_INFO"
-
-fi
+# if [ ! -d "$PYLINT_HOME" ]; then
+#     mkdir "$PYLINT_HOME"
+#     # Redirect the annoying pylint installation output.
+#     easy_install -d "$PYLINT_HOME" pylint==1.4.4 &>> "$PYLINT_INSTALL_INFO"
+#     easy_install_status="$?"
+#
+#     if [ "$easy_install_status" -ne 0 ]; then
+#         echo "Unable to install pylint locally in \"$PYTHONPATH\"."
+#         cat "$PYLINT_INSTALL_INFO"
+#         exit "$easy_install_status"
+#     fi
+#
+#     rm "$PYLINT_INSTALL_INFO"
+#
+# fi
 
 # There is no need to write this output to a file
 #+ first, but we do so so that the check status can

dev/run-tests.py

@@ -198,9 +198,8 @@ def run_scala_style_checks():
 
 
 def run_python_style_checks():
-    # set_title_and_block("Running Python style checks", "BLOCK_PYTHON_STYLE")
-    # run_cmd([os.path.join(SPARK_HOME, "dev", "lint-python")])
-    pass
+    set_title_and_block("Running Python style checks", "BLOCK_PYTHON_STYLE")
+    run_cmd([os.path.join(SPARK_HOME, "dev", "lint-python")])
 
 
 def build_spark_documentation():