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• Python Patterns - An Optimization Anecdote

  ...chr(item), as executed by the bytecode interpreter, is probably a bit slower than when executed by the map() function - the bytecode interpreter must execute three bytecode instructions for each call (load 'chr', load 'item', call), while the map() function does it all in C. This led us to consider a compromise, which wouldn't waste extra space, but which would speed up the lookup for the chr() function: def f4(list): string = "" lchr = chr for item...

• Notes

  ...chr(0) + chr(255) '\texample \r\n\x00\xff' # in 2.1 '\011example \015\012\000\377' # in 2.0 Functions are now compared and hashed by identity, not by value, since the func_code attribute is writable. Weak references (PEP 205) have been added. This involves a few changes in the core, an extension module (_weakref), and a Python module (weakref). The weakref module is the public interface. It includes support for "explicit" weak references, proxy objects, and mappings wit...

• What's New In Python 3.0

  ...chr(), the "%c" format now accepts unicode code points beyond the Basic Multilingual Plane (above 0xffff) on all configurations. On "narrow Unicode" builds, the result is a string of 2 code units, forming a UTF-16 surrogate pair. Issue #3282: str.isprintable() should return False for undefined Unicode characters. Issue #3236: Return small longs from PyLong_FromString. Exception tracebacks now support exception chaining. Library Removed the sunaudio module. Use sunau inste...

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