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contextlib2.pyo
� �s�Wc @ s� d Z d d l Z d d l Z d d l m Z d d l m Z d d d d d d d g Z e d g 7Z d e f d � � YZ d e f d � � YZ d � Z d e f d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ e j d d k Z e r7d � Z d � Z n d � Z d � Z y d d l m Z Wn e k rve Z n Xd � Z d e f d � � YZ d e f d � � YZ d S(! sA contextlib2 - backports and enhancements to the contextlib modulei����N( t deque( t wrapst contextmanagert closingt ContextDecoratort ExitStackt redirect_stdoutt redirect_stderrt suppresst ContextStackc B s) e Z d Z d � Z d � Z d � Z RS( sJ A base class or mixin that enables context managers to work as decorators.c C s t j d t � | j � S( s� Returns the context manager used to actually wrap the call to the decorated function. The default implementation just returns *self*. Overriding this method allows otherwise one-shot context managers like _GeneratorContextManager to support use as decorators via implicit recreation. DEPRECATED: refresh_cm was never added to the standard library's ContextDecorator API s2 refresh_cm was never added to the standard library( t warningst warnt DeprecationWarningt _recreate_cm( t self( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt refresh_cm s c C s | S( s6 Return a recreated instance of self. Allows an otherwise one-shot context manager like _GeneratorContextManager to support use as a decorator via implicit recreation. This is a private interface just for _GeneratorContextManager. See issue #11647 for details. ( ( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR " s c s" t � � � � f d � � } | S( Nc s$ � j � � � | | � SWd QXd S( N( R ( t argst kwds( t funcR ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt inner/ s ( R ( R R R ( ( R R s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt __call__. s ( t __name__t __module__t __doc__R R R ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR s t _GeneratorContextManagerc B s2 e Z d Z d � Z d � Z d � Z d � Z RS( s% Helper for @contextmanager decorator.c C sl | | | � | _ | | | | _ | _ | _ t | d d � } | d k r_ t | � j } n | | _ d S( NR ( t genR R R t getattrt Nonet typeR ( R R R R t doc( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt __init__9 s c C s | j | j | j | j � S( N( t __class__R R R ( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR G s c C s5 y t | j � SWn t k r0 t d � � n Xd S( Ns generator didn't yield( t nextR t StopIterationt RuntimeError( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt __enter__M s c C s | d k rA y t | j � Wn t k r1 d SXt d � � n� | d k rY | � } n y& | j j | | | � t d � � Wnz t k r� } | | k St k r� } | | k r� t St r� | j | k r� t S� n# t j � d | k r� � q� n Xd S( Ns generator didn't stops# generator didn't stop after throw()i ( R R R R! R" t throwt Falset _HAVE_EXCEPTION_CHAININGt __cause__t syst exc_info( R R t valuet tracebackt exc( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt __exit__S s, ( R R R R R R# R- ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR 6 s c s t � � � f d � � } | S( s� @contextmanager decorator. Typical usage: @contextmanager def some_generator(<arguments>): <setup> try: yield <value> finally: <cleanup> This makes this: with some_generator(<arguments>) as <variable>: <body> equivalent to this: <setup> try: <variable> = <value> <body> finally: <cleanup> c s t � | | � S( N( R ( R R ( R ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt helper� s ( R ( R R. ( ( R s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR ~ s c B s) e Z d Z d � Z d � Z d � Z RS( s2 Context to automatically close something at the end of a block. Code like this: with closing(<module>.open(<arguments>)) as f: <block> is equivalent to this: f = <module>.open(<arguments>) try: <block> finally: f.close() c C s | | _ d S( N( t thing( R R/ ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR � s c C s | j S( N( R/ ( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR# � s c G s | j j � d S( N( R/ t close( R R) ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR- � s ( R R R R R# R- ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR � s t _RedirectStreamc B s) e Z d Z d � Z d � Z d � Z RS( c C s | | _ g | _ d S( N( t _new_targett _old_targets( R t new_target( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR � s c C s9 | j j t t | j � � t t | j | j � | j S( N( R3 t appendR R( t _streamt setattrR2 ( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR# � s c C s t t | j | j j � � d S( N( R7 R( R6 R3 t pop( R t exctypet excinstt exctb( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR- � s N( R R R R6 R R# R- ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR1 � s c B s e Z d Z d Z RS( sA Context manager for temporarily redirecting stdout to another file. # How to send help() to stderr with redirect_stdout(sys.stderr): help(dir) # How to write help() to a file with open('help.txt', 'w') as f: with redirect_stdout(f): help(pow) t stdout( R R R R6 ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR � s c B s e Z d Z d Z RS( sC Context manager for temporarily redirecting stderr to another file.t stderr( R R R R6 ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR � s c B s) e Z d Z d � Z d � Z d � Z RS( s? Context manager to suppress specified exceptions After the exception is suppressed, execution proceeds with the next statement following the with statement. with suppress(FileNotFoundError): os.remove(somefile) # Execution still resumes here if the file was already removed c G s | | _ d S( N( t _exceptions( R t exceptions( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR � s c C s d S( N( ( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR# � s c C s | d k o t | | j � S( N( R t issubclassR> ( R R9 R: R; ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR- � s ( R R R R R# R- ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR � s i i c s � f d � } | S( Nc sO x? | j } | | k r d S| d k s4 | � k r8 Pn | } q W| | _ d S( N( t __context__R ( t new_exct old_exct exc_context( t frame_exc( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt _fix_exception_context s ( ( RE RF ( ( RE s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt _make_context_fixer s c C sC y | d j } | d � Wn! t k r> | | d _ � n Xd S( Ni ( RA t BaseException( t exc_detailst fixed_ctx( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt _reraise_with_existing_context s c C s d � S( Nc S s d S( N( R ( RB RC ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt <lambda> t ( ( RE ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyRG s c B s | \ } } } d d Ud S( Ns! raise exc_type, exc_value, exc_tb( ( RI t exc_typet exc_valuet exc_tb( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyRK " s ( t InstanceTypec C s# t | � } | t k r | j S| S( N( R RQ R ( t objt obj_type( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt _get_type. s c B s_ e Z d Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z RS( s� Context manager for dynamic management of a stack of exit callbacks For example: with ExitStack() as stack: files = [stack.enter_context(open(fname)) for fname in filenames] # All opened files will automatically be closed at the end of # the with statement, even if attempts to open files later # in the list raise an exception c C s t � | _ d S( N( R t _exit_callbacks( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR A s c C s+ t | � � } | j | _ t � | _ | S( s? Preserve the context stack by transferring it to a new instance( R RU R ( R t new_stack( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt pop_allD s c s, � � f d � } � | _ | j | � d S( s: Helper to correctly register callbacks to __exit__ methodsc s � � | � S( N( ( RI ( t cmt cm_exit( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt _exit_wrapperM s N( t __self__t push( R RX RY RZ ( ( RX RY s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt _push_cm_exitK s c C sQ t | � } y | j } Wn! t k r< | j j | � n X| j | | � | S( s Registers a callback with the standard __exit__ method signature Can suppress exceptions the same way __exit__ methods can. Also accepts any object with an __exit__ method (registering a call to the method instead of the object itself) ( RT R- t AttributeErrorRU R5 R] ( R t exitt _cb_typet exit_method( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR\ R s c s/ � � � f d � } � | _ | j | � � S( s\ Registers an arbitrary callback and arguments. Cannot suppress exceptions. c s � � � � d S( N( ( RN R, t tb( R t callbackR ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyRZ k s ( t __wrapped__R\ ( R Rc R R RZ ( ( R Rc R s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyRc f s c C s8 t | � } | j } | j | � } | j | | � | S( s� Enters the supplied context manager If successful, also pushes its __exit__ method as a callback and returns the result of the __enter__ method. ( RT R- R# R] ( R RX t _cm_typet _exitt result( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt enter_contexts s c C s | j d d d � d S( s$ Immediately unwind the context stackN( R- R ( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR0 � s c C s | S( N( ( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR# � s c G s� | d d k } t j � d } t | � } t } t } xx | j r� | j j � } y% | | � rw t } t } d } n Wq; t j � } | | d | d � t } | } q; Xq; W| r� t | � n | o� | S( Ni i ( NNN( R R( R) RG R% RU R8 t TrueRK ( R RI t received_excRE RF t suppressed_exct pending_raiset cbt new_exc_details( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR- � s( ( R R R R RW R] R\ Rc Rh R0 R# R- ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR 5 s c B s2 e Z d Z d � Z d � Z d � Z d � Z RS( s+ Backwards compatibility alias for ExitStackc C s' t j d t � t t | � j � d S( Ns* ContextStack has been renamed to ExitStack( R R R t superR R ( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR � s c C s | j | � S( N( R\ ( R Rc ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt register_exit� s c O s | j | | | � S( N( Rc ( R Rc R R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt register� s c C s | j � S( N( RW ( R ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt preserve� s ( R R R R Rp Rq Rr ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyR � s ( R R( R t collectionsR t functoolsR t __all__t objectR R R R R1 R R R t version_infoR& RG RK t typesRQ t ImportErrorR RT R R ( ( ( s< /opt/alt/python27/lib/python2.7/site-packages/contextlib2.pyt <module> s8 (H " p
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