• Differences between Cython and Pyrex
• Package names and cross-directory imports
• List/Set/Dict comprehensions and inlined generator expressions
• Conditional expressions "x if b else y" (python 2.5)
• Extended iterable unpacking
• cdef inline
• Assignment on declaration (e.g. "cdef int spam = 5")
• 'by' expression in for loop (e.g. "for i from 0 <= i < 10 by 2")
• Automatic range conversion
• Boolean int type (e.g. it acts like a c int, but coerces to/from python as a boolean)
• Executable class bodies
• Improved error reporting (e.g. syntax error on non-existent builtin)
• Many optimizations (e.g. list indexing, tuple unpacking, caching of builtin names and integer constants)
• cpdef functions
• More friendly type casting
• Optional arguments in cdef/cpdef functions
• Function pointers in structs
• C++ Exception handling
• Synonyms
• Source code encoding
• Automatic type checking