pseudomethod - adds 'a..b()' syntax feature for dynamically calling ordinary functions as bound methods
Project description
pseudomethod - adds ‘a..b()’ syntax feature for dynamically calling ordinary functions as bound methods
REQUIRES LINUX OS AND PYTHON3.1
QUICK TEST: $ python3.1 setup.py build dev –quicktest
DESCRIPTION: pseudomethod - adds ‘a..b()’ syntax feature for dynamically calling ordinary functions as bound methods
SUMMARY: pseudomethod is a pure python module. pseudomethod is a python ast tree hack, adding the following syntax sugars: ‘..’ ‘…’ ‘….’. pseudomethod can extend restricted, unsubclassable python types like types.CodeType (python code object type). pseudomethod can flatten ugly nested function calls by sequentially binding their return values.
RECENT CHANGELOG: 20091231 - added lambda __printop__: sugar 20091224 - added pseudomethod interactive console - revamped pseudomethod import hook 20091224 - modularized package - fix install issues - added sdist check 20091209 - improved documentation 20091205 - moved source code to c++ 20091116 - package integrated
DEMO USAGE:
>>> ## start up the interactive console >>> import pseudomethod >>> pseudomethod.pseudomethod_console().interact()
Python 3.1.1 (r311:74480, Sep 13 2009, 17:17:12) [GCC 4.3.2] on linux2 Type “help”, “copyright”, “credits” or “license” for more information. (pseudomethod_console)
>>> from pseudomethod import *
>>> ## DYNAMICALLY BIND FUNCTION CALLS TO OBJECTS >>> ## bind the function call print() to 'hello' >>> print('hello') hello >>> 'hello' ..print() hello >>> 'hello' ..print('world') hello world >>> 'hello' ..print('world', '!') hello world ! >>> 'hello' ..print('world', '!', file = sys.stdout) hello world !
>>> ## create a string pseudomethod which appends an exclamation or another ending >>> def add_end(self, end = '!'): return self + end >>> 'hello' ..add_end() ..print() hello! >>> 'hello'.upper() ..add_end() ..print() HELLO! >>> 'hello'.upper() ..add_end(' world') ..print() HELLO world >>> 'hello'.upper() ..add_end(' world').lower() ..print() hello world >>> 'hello'.upper() ..add_end(' world').lower() ..add_end('!') ..print() hello world! >>> 'hello'.upper() ..add_end(' world').lower() ..add_end('!') ..add_end(end = '!') ..print() hello world!!
>>> ## OPERATOR PRECEDENCE >>> ## 'a..b()' has the same operator precedence as 'a.b()' which precedes <and or not + - * /> but not <= == ,> >>> def add(aa, bb): return aa + bb >>> print( 2 * 3 ..add(4) + 5 == 2 * (3 + 4) + 5 ) True >>> print( 3 == 1 ..add(2) ) True >>> print( 0, 0 ..add(1), 0 ) 0 1 0
>>> ## EXTEND RESTRICTED TYPES >>> ## the python code object type <class 'code'> cannot be subtyped nor will it accept any method binding. >>> ## however, we can extend it by dynamically binding ordinary functions. >>> ## here's a pseudomethod, which disassembles an instance of the type to a specified output >>> import dis, io, sys >>> def disassemble(self, file): ... backup_stdout = sys.stdout ## backup sys.stdout ... try: ... sys.stdout = file ... dis.dis(self) ## disassemble self ... return file ... finally: ... sys.stdout = backup_stdout ## restore sys.stdout
>>> code_source = 'print( "hello" )'; code_object = compile(code_source, '', 'exec'); exec( code_object ) hello >>> code_object ..disassemble(file = io.StringIO()).getvalue() ..print() 1 0 LOAD_NAME 0 (print) 3 LOAD_CONST 0 ('hello') 6 CALL_FUNCTION 1 9 POP_TOP 10 LOAD_CONST 1 (None) 13 RETURN_VALUE
>>> ## '...' AND '....' SYNTAX >>> ## sometimes we instead want the 2nd or 3rd argument of a function bound to an object. >>> ## '...' and '....' will do this respectively >>> '2nd' ...print(0, 0) 0 2nd 0 >>> '3rd' ....print(0, 0) 0 0 3rd
>>> ## '....' is useful for chaining re.sub >>> ss = 'file = io.StringIO(); print 1, 2, 3 >> file; print file.getvalue()'; print( ss ) file = io.StringIO(); print 1, 2, 3 >> file; print file.getvalue()
>>> print( ... re.sub('print (.*?)$', 'print( \\1 )', ... re.sub('print (.*) >> (.*?);', 'print( \\1, file = \\2 );', ss) ... ) ... ) file = io.StringIO(); print( 1, 2, 3, file = file ); print( file.getvalue() )
>>> ss ....re.sub('print (.*) >> (.*?);', 'print( \\1, file = \\2 );') \ ... ....re.sub('print (.*?)$', 'print( \\1 )') \ ... ..print() file = io.StringIO(); print( 1, 2, 3, file = file ); print( file.getvalue() )
>>> ## in fact, another primary use of pseudomethod is to flatten ugly, hard-to-read, lisp-like nested function calls >>> print( dict( enumerate( zip( 'abc', sorted( 'abc bca cab'.split(' '), key = lambda x: x[1] ) ) ) ) ) {0: ('a', 'cab'), 1: ('b', 'abc'), 2: ('c', 'bca')}
>>> 'abc bca cab'.split(' ') ..sorted(key = lambda x: x[1]) ...zip('abc') ..enumerate() ..dict() ..print() {0: ('a', 'cab'), 1: ('b', 'abc'), 2: ('c', 'bca')}
>>> ## IMPORT MODULES WRITTEN WITH PSEUDOMETHOD SYNTAX >>> ## in fact, this package was written with pseudomethod syntax
>>> ## enable pseudomethod import hook >>> import pseudomethod >>> pseudomethod.IMPORTER.add_hook() pseudomethod_importer - adding hook <pseudomethod.pseudomethod_importer object at 0x870ddec> to sys.meta_path <pseudomethod.pseudomethod_importer object at 0x870ddec>
>>> ## create test_module.py >>> open('test_module.py', 'w').write('"hello" ..print()\n') 35
>>> ## during import, add the magic prefix 'pseudomethod.' to the beginning of the module name >>> import pseudomethod.test_module hello
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