diff --git a/syntax/python.vim b/syntax/python.vim
index aebb15ad..090e9be1 100644
--- a/syntax/python.vim
+++ b/syntax/python.vim
@@ -250,16 +250,16 @@ endif
" Numbers {{{
" ===========
- syn match pythonHexError "\<0[xX]\x*[g-zG-Z]\x*[lL]\=\>" display
- syn match pythonHexNumber "\<0[xX]\x\+[lL]\=\>" display
- syn match pythonOctNumber "\<0[oO]\o\+[lL]\=\>" display
- syn match pythonBinNumber "\<0[bB][01]\+[lL]\=\>" display
- syn match pythonNumber "\<\d\+[lLjJ]\=\>" display
- syn match pythonFloat "\.\d\+\([eE][+-]\=\d\+\)\=[jJ]\=\>" display
- syn match pythonFloat "\<\d\+[eE][+-]\=\d\+[jJ]\=\>" display
- syn match pythonFloat "\<\d\+\.\d*\([eE][+-]\=\d\+\)\=[jJ]\=" display
- syn match pythonOctError "\<0[oO]\=\o*[8-9]\d*[lL]\=\>" display
- syn match pythonBinError "\<0[bB][01]*[2-9]\d*[lL]\=\>" display
+ syn match pythonHexError "\<0[xX][0-9a-fA-F_]*[g-zG-Z][0-9a-fA-F_]*[lL]\=\>" display
+ syn match pythonHexNumber "\<0[xX][0-9a-fA-F_]*[0-9a-fA-F][0-9a-fA-F_]*[lL]\=\>" display
+ syn match pythonOctNumber "\<0[oO][0-7_]*[0-7][0-7_]*[lL]\=\>" display
+ syn match pythonBinNumber "\<0[bB][01_]*[01][01_]*[lL]\=\>" display
+ syn match pythonNumber "\<[0-9][0-9_]*[lLjJ]\=\>" display
+ syn match pythonFloat "\.[0-9_]*[0-9][0-9_]*\([eE][+-]\=[0-9_]*[0-9][0-9_]*\)\=[jJ]\=\>" display
+ syn match pythonFloat "\<[0-9][0-9_]*[eE][+-]\=[0-9_]\+[jJ]\=\>" display
+ syn match pythonFloat "\<[0-9][0-9_]*\.[0-9_]*\([eE][+-]\=[0-9_]*[0-9][0-9_]*\)\=[jJ]\=" display
+ syn match pythonOctError "\<0[oO]\=[0-7_]*[8-9][0-9_]*[lL]\=\>" display
+ syn match pythonBinError "\<0[bB][01_]*[2-9][0-9_]*[lL]\=\>" display
" }}}
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