Terminology in .NET

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Terminology
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Every piece of data stored in a program is an object Each object has an identity, a type (which is also known as its class), and a value For example, when you write a = 42, an integer object is created with the value of 42You can view the identity of an object as a pointer to its location in memory a is a name that refers to this specific location The type of an object, also known as the object s class, describes the internal representation of the object as well as the methods and operations that it supportsWhen an object of a particular type is created, that object is sometimes called an instance of that type After an instance is created, its identity and type cannot be changed If an object s value can be modified, the object is said to be mutable If the value cannot be modified, the object is said to be immutable An object that contains references to other objects is said to be a container or collection Most objects are characterized by a number of data attributes and methods An attribute is a value associated with an object A method is a function that performs some sort of operation on an object when the method is invoked as a function Attributes and methods are accessed using the dot () operator, as shown in the following example:
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a = 3 + 4j r = areal b = [1, 2, 3] bappend(7) # Create a complex number # Get the real part (an attribute) # Create a list # Add a new element using the append method
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The built-in function id() returns the identity of an object as an integerThis integer usually corresponds to the object s location in memory, although this is specific to the Python implementation and no such interpretation of the identity should be madeThe
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3 Types and Objects
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is operator compares the identity of two objectsThe built-in function type() returns
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the type of an object Here s an example of different ways you might compare two objects:
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# Compare two objects def compare(a,b): if a is b: # a and b are the same object statements if a == b: # a and b have the same value statements if type(a) is type(b): # a and b have the same type statements
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The type of an object is itself an object known as the object s classThis object is uniquely defined and is always the same for all instances of a given typeTherefore, the type can be compared using the is operator All type objects are assigned names that can be used to perform type checking Most of these names are built-ins, such as list, dict, and file Here s an example:
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if type(s) is list: sappend(item) if type(d) is dict: dupdate(t)
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Because types can be specialized by defining classes, a better way to check types is to use the built-in isinstance(object, type) function Here s an example:
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if isinstance(s,list): sappend(item) if isinstance(d,dict): dupdate(t)
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Because the isinstance() function is aware of inheritance, it is the preferred way to check the type of any Python object Although type checks can be added to a program, type checking is often not as useful as you might imagine For one, excessive checking severely affects performance Second, programs don t always define objects that neatly fit into an inheritance hierarchy For instance, if the purpose of the preceding isinstance(s,list) statement is to test whether s is list-like, it wouldn t work with objects that had the same programming interface as a list but didn t directly inherit from the built-in list type Another option for adding type-checking to a program is to define abstract base classesThis is described in 7
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