Edit File: contextlib2.cpython-37.pyc
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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 z2refresh_cm was never added to the standard library)�warnings�warn�DeprecationWarning� _recreate_cm)r$ r r r � refresh_cmL s zContextDecorator.refresh_cmc C s | S )a6 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 )r$ r r r r6 ] s z ContextDecorator._recreate_cmc s t � �� �fdd��}|S )Nc s �� � � � | |�S Q R X d S )N)r6 )�args�kwds)�funcr$ r r �innerj s z(ContextDecorator.__call__.<locals>.inner)r )r$ r: r; r )r: r$ r �__call__i s zContextDecorator.__call__N)r, r- r. r/ r7 r6 r< r r r r r I s c @ s0 e Zd ZdZdd� Zdd� Zdd� Zdd � Zd S ) �_GeneratorContextManagerz%Helper for @contextmanager decorator.c C sJ |||�| _ ||| | _| _| _t|dd �}|d kr@t| �j}|| _d S )Nr/ )�genr: r8 r9 �getattr�typer/ )r$ r: r8 r9 �docr r r �__init__t s z!_GeneratorContextManager.__init__c C s | � | j| j| j�S )N)� __class__r: r8 r9 )r$ r r r r6 � s z%_GeneratorContextManager._recreate_cmc C s, y t | j�S tk r& td��Y nX d S )Nzgenerator didn't yield)�nextr> � StopIteration� RuntimeError)r$ r r r r% � s z"_GeneratorContextManager.__enter__c C s� |d kr6yt | j� W n tk r* d S X td��n�|d krD|� }y | j�|||� td��W n� tk r� } z||k S d }~X Y n^ tk r� } z$||kr�dS tr�|j|kr�dS � W d d }~X Y n t�� d |k rނ Y nX d S )Nzgenerator didn't stopz#generator didn't stop after throw()F� ) rD r> rE rF �throw�_HAVE_EXCEPTION_CHAINING� __cause__�sys�exc_info)r$ r@ �valuer( �excr r r r) � s, z!_GeneratorContextManager.__exit__N)r, r- r. r/ rB r6 r% r) r r r r r= q s r= c s t � �� fdd��}|S )a� @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= )r8 r9 )r: r r �helper� s z contextmanager.<locals>.helper)r )r: rO r )r: r r � s c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) r a2 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)�thing)r$ rP r r r rB � s zclosing.__init__c C s | j S )N)rP )r$ r r r r% � s zclosing.__enter__c G s | j �� d S )N)rP �close)r$ rL r r r r) � s zclosing.__exit__N)r, r- r. r/ rB r% r) r r r r r � s c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS )�_RedirectStreamNc C s || _ g | _d S )N)� _new_target� _old_targets)r$ � new_targetr r r rB � s z_RedirectStream.__init__c C s* | j �tt| j�� tt| j| j� | jS )N)rT r r? rK �_stream�setattrrS )r$ r r r r% � s z_RedirectStream.__enter__c C s t t| j| j�� � d S )N)rW rK rV rT �pop)r$ �exctype�excinst�exctbr r r r) s z_RedirectStream.__exit__)r, r- r. rV rB r% r) r r r r rR � s rR c @ s e Zd ZdZdZdS )r aA 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) �stdoutN)r, r- r. r/ rV r r r r r s c @ s e Zd ZdZdZdS )r zCContext manager for temporarily redirecting stderr to another file.�stderrN)r, r- r. r/ rV r r r r r s c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) r a? 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)� _exceptions)r$ � exceptionsr r r rB ) s zsuppress.__init__c C s d S )Nr )r$ r r r r% , s zsuppress.__enter__c C s |d k ot || j�S )N)� issubclassr^ )r$ rY rZ r[ r r r r) / s zsuppress.__exit__N)r, r- r. r/ rB r% r) r r r r r s r c s � fdd�}|S )Nc s8 x,| j }||krd S |d ks$|� kr&P |} qW || _ d S )N)� __context__)�new_exc�old_exc� exc_context)� frame_excr r �_fix_exception_context@ s z3_make_context_fixer.<locals>._fix_exception_contextr )re rf r )re r �_make_context_fixer? s rg c C s< y| d j }| d �W n tk r6 || d _ � Y nX d S )NrG )ra � BaseException)� exc_details� fixed_ctxr r r � _reraise_with_existing_contextO s rk c C s dd� S )Nc S s d S )Nr )rb rc r r r �<lambda>[ � z%_make_context_fixer.<locals>.<lambda>r )re r r r rg Z s c C s | \}}}t d� d S )Nz!raise exc_type, exc_value, exc_tb)�exec)ri r& r' �exc_tbr r r rk _ s )� InstanceTypec C s t | �}|tkr| jS |S )N)r@ rp rC )�objZobj_typer r r � _get_typek s rr c @ sX e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z dd� Z dd� Z dd� Z dS )r a� Context manager for dynamic management of a stack of exit callbacks For example: with ExitStack() as stack: files = [stack.enter_context(open(fname)) for fname in filenames] # All opened files will automatically be closed at the end of # the with statement, even if attempts to open files later # in the list raise an exception c C s t � | _d S )N)r �_exit_callbacks)r$ r r r rB s zExitStack.__init__c C s t | �� }| j|_t� | _|S )z?Preserve the context stack by transferring it to a new instance)r@ rs r )r$ � new_stackr r r �pop_all� s zExitStack.pop_allc s" � �fdd�}� |_ | �|� dS )z:Helper to correctly register callbacks to __exit__ methodsc s �� f| �� S )Nr )ri )�cm�cm_exitr r � _exit_wrapper� s z.ExitStack._push_cm_exit.<locals>._exit_wrapperN)�__self__�push)r$ rv rw rx r )rv rw r � _push_cm_exit� s zExitStack._push_cm_exitc C sD t |�}y |j}W n tk r2 | j�|� Y nX | �||� |S )a 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) )rr r) r rs r r{ )r$ �exit�_cb_type� exit_methodr r r rz � s zExitStack.pushc s$ � ��fdd�}�|_ | �|� �S )z\Registers an arbitrary callback and arguments. Cannot suppress exceptions. c s �� �� d S )Nr )r& rN �tb)r8 �callbackr9 r r rx � s z)ExitStack.callback.<locals>._exit_wrapper)� __wrapped__rz )r$ r� r8 r9 rx r )r8 r� r9 r r� � s zExitStack.callbackc C s( t |�}|j}|�|�}| �||� |S )z�Enters the supplied context manager If successful, also pushes its __exit__ method as a callback and returns the result of the __enter__ method. )rr r) r% r{ )r$ rv �_cm_type�_exitr r r r � enter_context� s zExitStack.enter_contextc C s | � ddd� dS )z$Immediately unwind the context stackN)r) )r$ r r r rQ � s zExitStack.closec C s | S )Nr )r$ r r r r% � s zExitStack.__enter__c G s� |d d k }t �� d }t|�}d}d}x\| jr�| j�� }y||� rPd}d}d}W q* t �� }||d |d � d}|}Y q*X q*W |r�t|� |o�|S )Nr rG FT)NNN)rK rL rg rs rX rk ) r$ ri � received_excre rf �suppressed_exc� pending_raise�cb�new_exc_detailsr r r r) � s( zExitStack.__exit__N) r, r- r. r/ rB ru r{ rz r� r� rQ r% r) r r r r r s s c s8 e Zd ZdZ� fdd�Zdd� Zdd� Zdd � Z� ZS ) r z+Backwards compatibility alias for ExitStackc s t �dt� tt| ��� d S )Nz*ContextStack has been renamed to ExitStack)r3 r4 r5 �superr rB )r$ )rC r r rB � s zContextStack.__init__c C s | � |�S )N)rz )r$ r� r r r � register_exit� s zContextStack.register_exitc O s | j |f|�|�S )N)r� )r$ r� r8 r9 r r r �register� s zContextStack.registerc C s | � � S )N)ru )r$ r r r �preserve� s zContextStack.preserve) r, r- r. r/ rB r� r� r� � __classcell__r r )rC r r � s c @ s* e Zd ZdZd dd�Zdd� Zdd� ZdS ) r aM Context manager that does no additional processing. Used as a stand-in for a normal context manager, when a particular block of code is only sometimes used with a normal context manager: cm = optional_cm if condition else nullcontext() with cm: # Perform operation, using optional_cm if condition is True Nc C s || _ d S )N)� enter_result)r$ r� r r r rB � s znullcontext.__init__c C s | j S )N)r� )r$ r r r r% s znullcontext.__enter__c G s d S )Nr )r$ �excinfor r r r) s znullcontext.__exit__)N)r, r- r. r/ rB r% r) r r r r r � s )$r/ r0 rK r3 � collectionsr � functoolsr �__all__� version_infor �_abc_ABC�ABCMeta�objectr r# r r r= r r rR r r r rI rg rk �typesrp � ImportErrorr@ rr r r r r r r r �<module> sL (H" q