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This can be simplifed.  The code in PyString_FromFormatV() 
massages the native %p result to guarantee it begins 
with "0x".  It didn't always do this, and inspect.py was 
written when Python didn't massage the native %p result at 
all.  Now there's no need to cater to "0X", or to cater to 
that "0x" might be missing.  The case of a-f may still differ 
across platforms, and that's deliberate (addresses are of 
most interest to C coders, and they're "used to" whichever 
case their platform delivers for %p in C code).