Added highlighting for else: and removed Error highlighting for numbers followed by a colon, e.g. if value==0:

syntax/python.vim

 syn keyword pythonStatement     with
 syn keyword pythonStatement     def class nextgroup=pythonFunction skipwhite
 syn keyword pythonRepeat        for while
-syn keyword pythonConditional   if elif else
+syn keyword pythonConditional   if elif else else:
 syn keyword pythonImport        import
 syn keyword pythonException     try except finally
 syn keyword pythonOperator      and in is not or
 
   syn match   pythonNumberError	"\<\d\+\D\>" display
   syn match   pythonNumberError	"\<0\d\+\>" display
-  syn match   pythonNumber	"\<\d\>" display
-  syn match   pythonNumber	"\<[1-9]\d\+\>" display
-  syn match   pythonNumber	"\<\d\+[jJ]\>" display
+  syn match   pythonNumber	"\<\d\:\=\>" display
+  syn match   pythonNumber	"\<[1-9]\d\+\:\=\>" display
+  syn match   pythonNumber	"\<\d\+[jJ]\:\=\>" display
 
   syn match   pythonOctError	"\<0[oO]\=\o*[8-9]\d*\>" display
   syn match   pythonBinError	"\<0[bB][01]*[2-9]\d*\>" display

test.py

 # Numbers
 
 0 1 2 9 10 0x1f .3 12.34 0j 0j 34.2E-3 0b10 0o77 1023434 0x0
-
+0:
 # Erroneous numbers
 
 077 100L 0xfffffffL 0L 08 0xk 0x  0b102 0o78 0o123LaB
 
 # Trailing space errors.
 
-    	
-    break	    
-"""  	
-   	 
-    test    	
-"""  	
+
+    break
+"""
+
+    test
+"""