By David M. Reed

THIS ebook is meant to be used in a standard college-level info buildings path (commonly often called CS2). This ebook assumes that scholars have discovered the elemental syntax of Python and been uncovered to using latest periods. most standard CS1 classes that use Python may have coated the entire priceless subject matters, and a few could have lined a number of the issues coated during this publication. we've got stumbled on that the majority scholars effectively finishing a CS1 direction understand how to exploit periods, yet lots of them desire extra adventure to profit how you can layout and write their very own sessions.

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Extra info for Data Structures and Algorithms Using Python and C++

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A Python tuple is an immutable (unchangeable) sequence of values. A tuple literal is indicated by enclosing a comma-separated sequence in parentheses. Using tuples, the ace of clubs would be represented by the tuple ( 1 , ' c ' ) and the king of spades would be ( 13 , ' s ' ) . The underlying representation of an ADT is called the concrete representation. We would say that the tuple (5 , ' d ' ) is the concrete representation of the abstract Card known as the five of diamonds. Now that we have a representation for our Card ADT, writing the implementa­ tion code is straightforward.

Pop ( ) returns the last number in the list and also deletes that item from the list. The loop continues until all the items in the list have been processed. This version of std_deviat i on returns the correct value, so it would seem to meet the contract specified by the pre- and postconditions. However, the list object nums passed as a parameter is mutable, and the changes to the list will be visible to the client. The user of this code is likely to be quite surprised when they find out that calling std_deviation ( examScores) causes all the values in examScores to be deleted!

Other designers might choose different types for the parameters of the various operations. Perhaps suits might be represented with ints instead of strings. Another approach is to " hide" the exact representation of suits and ranks by simply providing a set of variables representing the suits and ranks. For example, an identifier named CLUBS might be assigned to some value representing that suit, similar to the way the identifier None refers to Python's special None object. The ranks could be represented using names like ACE, TWO, THREE, etc.

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