Unlike strings, Python lists are not mutable

The median is the average of a set of data.

Standard deviation measures how spread out a data set is.

Arrays are usually heterogeneous, but lists are homogeneous.

A Python list cannot grow and shrink in size.

Unlike strings, Python lists are not mutable.

A list must contain at least one item.

Items can be removed from a list with the del operator.

A tuple is similar to an immutable list.

A Python dictionary is a kind of sequence

The items dictionary method returns a(n) a) int b) sequence of tuples c) bool d) dictionary

Write an automated censor program that reads in the text from a file and creates a new file where all of the four-letter words have been replaced by 11 **** 11 You can ignore punctuation, and you may assume that no words in the file are split across multiple lines.

Extend the program from the previous exercise to accept a file of censored words as another input. The words in the original file that appear in the censored words file are replaced by a string of 11 * 11 s with length equal to the number of characters in the censored word.

Write a program that creates a list of card objects (see Programming Exercise 11 from Chapter 10) and prints out the cards grouped by suit and in rank order within suit. Your program should read the list of cards from a file, where each line in the file represents a single card with the rank and suit separated by a space. Hint: First sort by rank and then by suit.

Extend the previous program to analyze a list of five cards as a poker hand. After printing the cards, the program categorizes accordingly. Royal Flush 10, jack, queen, king, ace, all of the same suit. Straight Flush Five ranks in a row, all of the same suit. Four of a Kind Four of the same rank. Full House Three of one rank and two of another. Flush Five cards of the same suit. Straight Five ranks in a row. Three of a kind Three of one rank (but not a full house or four of a kind) . Two pair Two each of two different ranks. Pair Two of the same rank (but not two pair, three or four of a kind). X High If none of the previous categories fit, X is the value of the highest rank. For example, if the largest rank is 1 1, the hand is 'jack high."

Create a class Deck that represents a deck of cards. Your class should have the following methods: constructor Creates a new deck of 52 cards in a standard order. shuffie Randomizes the order of the cards. deal Card Returns a single card from the top of the deck and removes the card from the deck. cardsLeft Returns the number of cards remaining in the deck. Test your program by having it deal out a sequence of n cards from a shuffled deck where n is a user input. You could also use your deck object to implement a Blackjack simulation where the pool of cards is finite. See Programming Exercises 8 and 9 in Chapter 9.

Create a class called StatSet that can be used to do simple statistical calculations. The methods for the class are: __ init __ ( self ) Creates a StatSet with no data in it. 415 addNumber ( self , x) x is a number. Adds the value x to the statSet. mean(self ) Returns the mean of the numbers in this statSet. median( self ) Returns the median of the numbers in this statSet. stdDev( self ) Returns the standard deviation of the numbers in this statSet. count ( self ) Returns the count of numbers in this statSet. min(self) Returns the smallest value in this statSet. max (self ) Returns the largest value in this statSet. Test your class with a program similar to the simple statistics program from this chapter.

In graphics applications, it is often useful to group separate pieces of a drawing together into a single object. For example, a face might be drawn from individual shapes, but then positioned as a whole group. Create a new class GraphicsGroup that can be used for this purpose. A GraphicsGroup will manage a list of graphics objects and have the following methods: __ init __ ( self , anchor) anchor is a Point. Creates an empty group with the given anchor point. get Anchor ( self ) Returns a clone of the anchor point. addObj ect ( self , gObj ect) gObj ect is a graphics object. Adds gObj ect to the group. move ( self , dx , dy) Moves all of the objects in the group (including the anchor point) . draw(self , win) Draws all the objects in the group into win. The anchor point is not drawn. undraw( self ) Undraws all the objects in the group. Use your new class to write a program that draws some simple picture with multiple components and moves it to wherever the user clicks.

Extend the random walk program from Chapter 9 (Programming Exercise 12). Consider the sidewalk as a sequence of squares, and each step moves the walker one square. Your program should keep track of how many times each square of the sidewalk is stepped on. Start your walker in the middle of a sidewalk of length n where n is a user input, and continue the simulation until it drops off one of the ends. Then print out the counts of how many times each square was landed on.

Create and test a Set class to represent a classical set. Your sets should support the following methods: Set (elements) Creates a set (elements is the initial list of items in the set). addElement (x) Adds x to the set. deleteElement (x) Removes x from the set, if present. If x is not in the set, the set is left unchanged. member (x) Returns true if x is in the set and false otherwise. intersection( set2) Returns a new set containing just those elements that are common to this set and set2. union( set2) Returns a new set containing all of elements that are in this set, set2, or both. subtract ( set2) Returns a new set containing all the elements of this set that are not in set2. By the way, sets are so useful that Python actually has a built-in set datatype. While you may want to investigate Python's set, you should not use it here. The point of this exercise is to help you develop your skills in algorithm development using lists and dictionaries.

Extend the cannonball animation from the chapter to allow the user to adjust the initial height of the launcher. The height adjustment should be handled similar to the way angle and velocity are. Pick a pair of keys of your own choosing for adjusting the height up and down.

Extend the cannonball animation example to include target objects. A target is a randomly sized rectangle that is placed somewhere downrange in the animation. When a target is hit, it disappears and a new target is generated. Further extensions could involve moving targets and keeping track of the number of hits.