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...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...
...chr() function was replaced, and executes the original bytecode calling chr(65). On a microbenchmark, calling the specialized bytecode takes 88 ns, whereas the original function takes 145 ns (+57 ns): 1.6 times as fast. Using builtin function Add the C builtin chr() function as the specialized code instead of a bytecode calling chr(obj): import myoptimizer def func(arg): return chr(arg) myoptimizer.specialize(func, chr, [myoptimizer.GuardBuiltins("chr")]) Example...
...chr(65+i)) for i in range(4)]) is semantically equivalent to: >>> {i : chr(65+i) for i in range(4)} The dictionary constructor approach has two distinct disadvantages from the proposed syntax though. First, it isn't as legible as a dict comprehension. Second, it forces the programmer to create an in-core list object first, which could be expensive. Examples >>> print {i : chr(65+i) for i in range(4)} {0 : 'A', 1 : 'B', 2 : 'C', 3 : 'D'} >>> print {k : v for k...
...chr builtin (with the same behaviour as bytes.fromint), recreating the ord/chr/unichr trio from Python 2 under a different naming scheme (ord/bchr/chr). The SC indicated they didn't think this functionality was needed often enough to justify offering two ways of doing the same thing, especially when one of those ways was a new builtin function. That part of the proposal was therefore dropped as being redundant with the bytes.fromint alternate constructor. Developers that use this method frequent...
...chr, newcode)) codeobj = type(co)(co.co_argcount, co.co_nlocals, co.co_stacksize, co.co_flags, codestr, tuple(newconsts), co.co_names, co.co_varnames, co.co_filename, co.co_name, co.co_firstlineno, co.co_lnotab, co.co_freevars, co.co_cellvars) return type(f)(codeobj, f.func_globals, f.func_name, f.func_defaults, f.func_closure) def bind_all(mc, builtin_only=False, stoplist=[], verbose=Fa...
...chr(int(ij, 16)) Note that this is the same as in 1.6 and before. In a Unicode string, \xij acts the same as \u00ij i.e. it expands to the obvious Latin-1 character from the initial segment of the Unicode space. An \x not followed by at least two hex digits is a compile-time error, specifically ValueError in 8-bit strings, and UnicodeError (a subclass of ValueError) in Unicode strings. Note that if an \x is followed by more than two hex digits, only the first two are "consumed". In 1.6 an...
...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...
...chr(i) --> Unicode object for character i (provided it is 32-bit); ValueError otherwise Both APIs should go into __builtins__ just like their string counterparts ord() and chr(). Note that Unicode provides space for private encodings. Usage of these can cause different output representations on different machines. This problem is not a Python or Unicode problem, but a machine setup and maintenance one. Comparison & Hash Value Unicode objects should compare equal to other ...
...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...