Fix PEP 8 errors

Also:
- update .gitignore with results of coverage
- update Makefile to limit pep8 checking to edx folder

Change-Id: Ic4047bf45bd89087249fee76a447eeecc5de8642

.gitignore

@@ -34,3 +34,9 @@ nosetests.xml
 .mr.developer.cfg
 .project
 .pydevproject
+
+# QA
+coverage.xml
+diff_*.html
+*.report
+report

Makefile

@@ -27,5 +27,5 @@ coverage: test
 	diff-quality --violations=pylint --html-report diff_quality_pylint.html
 
 	# Compute style violations
-	pep8 > pep8.report || echo "Not pep8 clean"
+	pep8 edx > pep8.report || echo "Not pep8 clean"
 	pylint -f parseable edx > pylint.report || echo "Not pylint clean"

edx/__init__.py

-

edx/analytics/__init__.py

-

edx/analytics/tasks/__init__.py

-

edx/analytics/tasks/reports/enrollments.py

@@ -190,7 +190,7 @@ class EnrollmentsByWeek(luigi.Task):
 
         # List the dates of the last day of each week requested.
         start, weeks = self.date, self.weeks
-        days = [start - timedelta(i*7) for i in reversed(xrange(0, weeks))]
+        days = [start - timedelta(i * 7) for i in reversed(xrange(0, weeks))]
 
         # Sample the cumulative data on the requested days.
         # Result is NaN if there is no data available for that date.