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4-1Python objects
All Python objects have three attributes:type,ID,and value.
All are readonly with a possible expection of the value(which can be changed only if the object is mutable).
4-5str()and repr()
repr() is a built-in function while str() was a built-in function that changed to a factory function inPython2.2.They will both returns a string representation of an object;however,str()returns a printable string representation while repr() returns an evaluatable string representation of an object,meaning that it is astring that represents a Python object that would be created if passed to eval().
4-6Object equality
type(a) == type(b) whether the value of type(a) is the same as the value of type(b)... == is a value compare
type(a) is type(b) whether the type objects returned by type(a) and type(b) are the same object
Since there exists only one (type) object for each built-in type, there is no need to check their values; hence, only the latter form should be used.
isinstance(object, class-or-type-or-tuple) -> bool
Return whether an object is an instance of a class or of a subclass thereof.
With a type as second argument, return whether that is the object‘s type.
The form using a tuple, isinstance(x, (A, B, ...)), is a shortcut for
isinstance(x, A) or isinstance(x, B) or ... (etc.).
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原文地址：http://www.cnblogs.com/godiness/p/4808130.html
