CS 1110, Week 11 Notes
CS 1110, Week 11 Notes CS 1110-002
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This 2 page Class Notes was uploaded by Eunice on Saturday April 16, 2016. The Class Notes belongs to CS 1110-002 at Cornell University taught by Lee, Van Loan in Spring 2016. Since its upload, it has received 14 views. For similar materials see Intro to Computing using Python in ComputerScienence at Cornell University.
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Date Created: 04/16/16
CS 1110 Van Loan and Lee Spring 2016 April 12, 2016 Review o Point class: has attribute o type: data and functions that can work on that data o constructor builds an object and creates the box always has the same name as the class o invoking the constructor=building the object and the reference to it o dot notation: substitution mechanism get values of attributes to the left of the dot, a point object affiliated with self the argument (whatever is in the parenthesis) is affiliated with other List of Objects o list of objects vs. integers a single integer stored a reference to some object (ex. a point) is stored u = L.x list L, box 1, x value from object: assigned to u o importing modules that contain classes (defined within the module) means that you can use the class o assignment statement is like an address o can’t change all of (for example) x attributes at once, use a for loop instead April 14, 2016 references are different from assignments o with objects, two objects set = to each other is a reference, meaning that the two things will refer to the same object and changing the object will change both things o use the function ‘copy’ for creating separate assignment sorting o sorting by different characteristics write a ‘getter’ function that extracts the ‘key’ attribute getKEY() returns object.keyattribute complicated classes o class: packaging of data and methods that work on that data o override the “+” concatenation by defining __add__ similarly __mul__ o Boolean valued function: isinstance(object, class) is the object an instance of the class remember than if the object looks like a (for example) a fraction, it’s actually an integer, or maybe a float
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