diff --git a/Lib/ConfigParser.py b/Lib/ConfigParser.py
index 47243fbcf395..842a576cef67 100644
--- a/Lib/ConfigParser.py
+++ b/Lib/ConfigParser.py
@@ -418,7 +418,7 @@ class ConfigParser:
         r'\]'                                 # ]
         )
     OPTCRE = re.compile(
-        r'(?P<option>[^:=\s]+)'               # very permissive!
+        r'(?P<option>[^:=\s][^:=]*)'          # very permissive!
         r'\s*(?P<vi>[:=])\s*'                 # any number of space/tab,
                                               # followed by separator
                                               # (either : or =), followed
@@ -448,7 +448,8 @@ class ConfigParser:
             # comment or blank line?
             if line.strip() == '' or line[0] in '#;':
                 continue
-            if line.split(None, 1)[0].lower() == 'rem' and line[0] in "rR":      # no leading whitespace
+            if line.split(None, 1)[0].lower() == 'rem' and line[0] in "rR":
+                # no leading whitespace
                 continue
             # continuation line?
             if line[0].isspace() and cursect is not None and optname:
@@ -488,7 +489,7 @@ class ConfigParser:
                         # allow empty values
                         if optval == '""':
                             optval = ''
-                        optname = self.optionxform(optname)
+                        optname = self.optionxform(optname.rstrip())
                         cursect[optname] = optval
                     else:
                         # a non-fatal parsing error occurred.  set up the
diff --git a/Lib/test/test_cfgparser.py b/Lib/test/test_cfgparser.py
index 17f5ea68d4a1..90f7255540dd 100644
--- a/Lib/test/test_cfgparser.py
+++ b/Lib/test/test_cfgparser.py
@@ -16,6 +16,7 @@ def basic(src):
                  r'Internationalized Stuff',
                  r'Long Line',
                  r'Section\with$weird%characters[' '\t',
+                 r'Spaces',
                  r'Spacey Bar',
                  ],
            "unexpected list of section names")
@@ -26,6 +27,8 @@ def basic(src):
     verify(cf.get('Foo Bar', 'foo', raw=1) == 'bar')
     verify(cf.get('Spacey Bar', 'foo', raw=1) == 'bar')
     verify(cf.get('Commented Bar', 'foo', raw=1) == 'bar')
+    verify(cf.get('Spaces', 'key with spaces', raw=1) == 'value')
+    verify(cf.get('Spaces', 'another with spaces', raw=1) == 'splat!')
 
     verify('__name__' not in cf.options("Foo Bar"),
            '__name__ "option" should not be exposed by the API!')
@@ -225,6 +228,9 @@ foo[bg]: Bulgarian
 foo=Default
 foo[en]=English
 foo[de]=Deutsch
+[Spaces]
+key with spaces : value
+another with spaces = splat!
 """)
 write("""[Long Line]
 foo: this line is much, much longer than my editor