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For instancing to work, a session identi er must be preserved on the client so that subsequent calls from the client to the service can pass the session ID back to the service With ASPNET, this is done with a client-side cookie that is passed in the HTTP headers For instancing via ASMX to work, the client must enable cookies Because and , disthe standard HTTP bindings, allow cookies by default, you must de ne a binding con guration with in the client s Listing 76 shows enabling on the service

def strictly_typed(function): annotations = function__annotations__ arg_spec = inspectgetfullargspec(function) assert "return" in annotations, "missing type for return value" for arg in arg_specargs + arg_speckwonlyargs: assert arg in annotations, ("missing type for parameter '" + arg + "'") @functoolswraps(function) def wrapper(*args, **kwargs): for name, arg in (list(zip(arg_specargs, args)) + list(kwargsitems())): assert isinstance(arg, annotations[name]), ( "expected argument '{0}' of {1} got {2}"format( name, annotations[name], type(arg))) result = function(*args, **kwargs) assert isinstance(result, annotations["return"]), ( "expected return of {0} got {1}"format( annotations["return"], type(result))) return result return wrapper

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This decorator requires that every argument and the return value must be annotated with the expected type It checks that the function s arguments and return type are all annotated with their types when the function it is passed is created, and at runtime it checks that the types of the actual arguments match those expected The inspect module provides powerful introspection services for objects Here, we have made use of only a small part of the argument speci cation object it returns, to get the names of each positional and keyword argument in the correct order in the case of the positional arguments These names are then used in conjunction with the annotations dictionary to ensure that every parameter and the return value are annotated The wrapper function created inside the decorator begins by iterating over every name argument pair of the given positional and keyword arguments Since zip() returns an iterator and dictionaryitems() returns a dictionary view we cannot concatenate them directly, so rst we convert them both to lists If any actual argument has a different type from its corresponding annotation the assertion will fail; otherwise, the actual function is called and the type of the value returned is checked, and if it is of the right type, it is returned At the end of the strictly_typed() function, we return the wrapped function as usual Notice that the checking is done only in debug mode (which is Python s default mode controlled by the -O command-line option and the PYTHONOPTIMIZE environment variable) If we decorate the is_unicode_punctuation() function with the @strictly_typed decorator, and try the same examples as before using the decorated version, the annotations are acted upon:

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is_unicode_punctuation("zebr\a") is_unicode_punctuation(s="!@# ") is_unicode_punctuation(("!", "@")) # returns: False # returns: True # raises AssertionError

Listing 77 shows how to enable cookies in the client-side con guration This listing was generated by Add Service Reference in Visual Studio Note is set to that the default value for

Now the argument types are checked, so in the last case an AssertionError is raised because a tuple is not a string or a subclass of str Now we will look at a completely different use of annotations Here s a small function that has the same functionality as the built-in range() function, except that it always returns floats:

def range_of_floats(*args) -> "author=Reginald Perrin": return (float(x) for x in range(*args))

No use is made of the annotation by the function itself, but it is easy to envisage a tool that imported all of a project s modules and produced a list of function names and author names, extracting each function s name from its __name__ attribute, and the author names from the value of the __annotations__ dictionary s "return" item

Enabling ASPNET impersonation is done the same way in WCF as it was in NET 1X This is accomplished by including < in the section of the le When you do this, client credentials are automatically passed to the service, and the service executes operations using the client s credentials Enabling impersonation can be done in one of two ways To set it at the = in the serservice level, use in the operation behavvice behavior and ior To enable it at the operation level, use in the operation behavior without any reference at the service behavior Listing 78 shows setting impersonation at the operation level, assuming When a client accesses it is not disallowed at the service level in this service, the logged-on identity of the user is returned in the member If the operation behavior is removed, the member defaults to the network service Impersonation is covered in more detail in 8, Security

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