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Demo
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metaclasses
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� ��^c @ s� d Z d d l Z d d l Z d d d � � YZ d d d � � YZ d d d � � YZ d e f d � � YZ e d d i d d 6� Z d � Z e d k r� e � n d S( s? Tracing metaclass. XXX This is very much a work in progress. i����Nt TraceMetaClassc B s> e Z d Z d Z d � Z d � Z d � Z d � Z d Z RS( sU Metaclass for tracing. Classes defined using this metaclass have an automatic tracing feature -- by setting the __trace_output__ instance (or class) variable to a file object, trace messages about all calls are written to the file. The trace formatting can be changed by defining a suitable __trace_call__ method. i c C s( | | _ | | _ | | _ d | _ d S( Ni ( t __name__t __bases__t _TraceMetaClass__dictt _TraceMetaClass__inited( t selft namet basest dict( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyt __init__ s c C si y | j | SWnS t k rd x6 | j D]+ } y | j | � SWq) t k rS q) Xq) Wt | � n Xd S( N( R t KeyErrorR t __getattr__t AttributeError( R R t base( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR s c C s* | j s | | j | <n | | j | <d S( N( R t __dict__R ( R R t value( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyt __setattr__( s c O sZ t � } | j | � y | j d � } Wn t k rE d � } n Xt | | | � | S( NR c S s d S( N( t None( ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyt <lambda>4 t ( t TracingInstancet __meta_init__R R t apply( R t argst kwt instt init( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyt __call__. s N( R t __module__t __doc__R R R R R R t __trace_output__( ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR s R c B s) e Z d Z d � Z d � Z d � Z RS( s9 Helper class to represent an instance of a tracing class.c G s | j | d | � d S( Ns ( t write( R t fpt fmtR ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyt __trace_call__= s c C s | | _ d S( N( t _TracingInstance__class( R t klass( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR @ s c C s� y | j j | � } Wn t k r2 t | � n Xt | � t j k rL | S| j j d | } | j sv | d k r� t | | | � St | | | � Sd S( Nt .R" ( R# R R t typet typest FunctionTypeR R t NotTracingWrappert TracingWrapper( R R t rawt fullname( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR C s ( R R R R" R R ( ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR : s R) c B s e Z d � Z d � Z RS( c C s | | _ | | _ | | _ d S( N( R t funcR ( R R R- R ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR S s c O s t | j | j f | | � S( N( R R- R ( R R R ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR W s ( R R R R ( ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR) R s R* c B s e Z d � Z RS( c O s� | j j | j j d | j | j | | � y# t | j | j f | | � } WnM t j � \ } } } | j j | j j d | j | | � | | | � n' X| j j | j j d | j | � | Sd S( Ns# calling %s, inst=%s, args=%s, kw=%ss' returning from %s with exception %s: %ss returning from %s with value %s( R R" R R R R- t syst exc_info( R R R t rvt tt vt tb( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR [ s # ( R R R ( ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR* Z s t TracedR c C s� d t f d � � Ya d t f d � � Ya t d � } | GH| j GH| j d � GH| j d � GH| j d � GH| j d � GH| j d � GH| j GHt j GHt j GHt j GHt j GHt � } | GH| j d � GH| j d � GH| j GHd S( Nt Cc B s/ e Z d d � Z d � Z d � Z e j Z RS( i c S s | | _ d S( N( t x( R R6 ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR s R c S s | | _ d S( N( R6 ( R R6 ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyt m1t R c S s | j | S( N( R6 ( R t y( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyt m2u R ( R R R R7 R9 R. t stdoutR ( ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR5 r s t Dc B s e Z d � Z d Z RS( c S s d | f GHt j | | � S( Ns D.m2(%r)( R5 R9 ( R R8 ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR9 x s N( R R R9 R R ( ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyR; w s i� id i i! i i� ( R4 R5 R; R6 R7 R9 R ( R6 R8 ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyt _testp s( t __main__( ( ( ( ( R R' R. R R R) R* R R4 R< R ( ( ( s. /usr/lib64/python2.7/Demo/metaclasses/Trace.pyt <module> s 1
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