Index: Doc/library/configparser.rst
===================================================================
--- Doc/library/configparser.rst	(revision 61890)
+++ Doc/library/configparser.rst	(working copy)
@@ -34,7 +34,7 @@
 to other values in the same section, or values in a special ``DEFAULT`` section.
 Additional defaults can be provided on initialization and retrieval. Lines
 beginning with ``'#'`` or ``';'`` are ignored and may be used to provide
-comments.
+comments. Whitespace is allowed before the comment delimiter.
 
 For example::
 
Index: Lib/ConfigParser.py
===================================================================
--- Lib/ConfigParser.py	(revision 61890)
+++ Lib/ConfigParser.py	(working copy)
@@ -451,7 +451,7 @@
 break
 lineno = lineno + 1
 # comment or blank line?
- if line.strip() == '' or line[0] in '#;':
+ if line.strip() == '' or line.strip()[0] in '#;':
 continue
 if line.split(None, 1)[0].lower() == 'rem' and line[0] in "rR":
 # no leading whitespace
Index: Lib/test/test_cfgparser.py
===================================================================
--- Lib/test/test_cfgparser.py	(revision 61890)
+++ Lib/test/test_cfgparser.py	(working copy)
@@ -46,6 +46,8 @@
 "[Spacey Bar]\n"
 "foo = bar\n"
 "[Commented Bar]\n"
+ " # a comment: with leading spaces\n"
+ " ; another : one\n"
 "foo: bar ; comment\n"
 "[Long Line]\n"
 "foo: this line is much, much longer than my editor\n"
@@ -100,6 +102,10 @@
 eq(cf.get('Long Line', 'foo'),
 'this line is much, much longer than my editor\nlikes it.')
 
+ # Issue 1524825 : allow leading spaces for comments
+ self.failIf(cf.has_option('Commented bar', ' # a comment'))
+ self.failIf(cf.has_option('Commented bar', ' ; another'))
+
 def test_case_sensitivity(self):
 cf = self.newconfig()
 cf.add_section("A")
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