Added functions for reading non-comment or empty lines of a file.

src/utils.py

@@ -511,6 +511,21 @@ class IterableMap(object):
         return False
 
 
+def nonCommentLines(fd):
+    for line in fd:
+        if not line.startswith('#'):
+            yield line
+
+def nonEmptyLines(fd):
+##     for line in fd:
+##         if line.strip():
+##             yield line
+    return ifilter(str.strip, fd)
+
+def nonCommentNonEmptyLines(fd):
+    return nonEmptyLines(nonCommentLines(fd))
+
+
 if __name__ == '__main__':
     import sys, doctest
     doctest.testmod(sys.modules['__main__'])

test/test_utils.py

@@ -311,6 +311,15 @@ class UtilsTest(unittest.TestCase):
         for s in ['lambda: 2', 'import foo', 'foo.bar']:
             self.assertRaises(ValueError, utils.safeEval, s)
 
+    def testLines(self):
+        L = ['foo', 'bar', '#baz', '  ', 'biff']
+        self.assertEqual(list(utils.nonEmptyLines(L)),
+                         ['foo', 'bar', '#baz', 'biff'])
+        self.assertEqual(list(utils.nonCommentLines(L)),
+                         ['foo', 'bar', '  ', 'biff'])
+        self.assertEqual(list(utils.nonCommentNonEmptyLines(L)),
+                         ['foo', 'bar', 'biff'])
+