Fix spacing of comments (pylint)

common/lib/calc/preview.py

@@ -89,7 +89,7 @@ def variable_closure(variables, casify):
         if varname in greek:
             return LatexRendered(ur"\{letter} ".format(letter=varname))
         else:
-            return LatexRendered(varname) #.replace("_", r"\_"))
+            return LatexRendered(varname)  # .replace("_", r"\_"))
     return render_variable
 
 

common/lib/calc/tests/test_preview.py

@@ -6,7 +6,7 @@ Unit tests for preview.py
 import unittest
 import preview
 import pyparsing
-from mock import MagicMock
+
 
 class PreviewTestUtility(unittest.TestCase):
     def assert_latex_rendered(self, to_be_tested, tall=False, latex=None, sans_parens=None):
@@ -198,7 +198,7 @@ class LatexPreviewTest(unittest.TestCase):
             '11*',
             'f((x)',
             'sqrt(x^)',
-            '3f(x)', # not 3*f(x)
+            '3f(x)',  # Not 3*f(x)
             '3|4',
             '3|||4'
         ]