Generalized expression would involve only the variables p 0.p 14 and q 0.q 14Īnd would return true if and only if a legal move turns board p into board q. Possible different moves at any given board position and taking the OR of their evaluations. This expression, however, can be generalized to check for all valid moves by constructing expressions for each of the 36 To a false, then the whole expression evaluates to a false. The above expression evaluates to true only when p 0.p 14 and q 0.q 14 representīoard states such that performing the move (3, 1, 0) turns board p into board q. Valid(p, q, (3, 1, 0)) = (p3 & ~q3) & (p1 & ~q1) & (~p0 & q0) &įigure 4: Boolean expression for checking move transition. The following boolean expression does the We mustĪlso check that all other states besides holes i, j, and k are not affected. I and j in board p no longer exist in board q and that hole k which was originally empty in p is now filled in q. To do this, we must simply check that pegs initially existing at positions Given applied to board p results in board q. P 0.p 14 and q 0.q 14 and a move (i, j, k), we can test to see if the move Now, let us denote a move by the ordered triple (i, j, k) designating that peg i jumps over peg j and ends up at hole k.įor instance, in the example above, the move performed was (3, 1, 0). If we consider the move from Figure 1, the truth values for p 0.p 14 andįigure 3: Move transition boolean values. Q j is true if and only if a peg is found at location j after the move has been made. p i is true if and only if a peg is found at location i before the move is made likewise, Let p 0.p 14 be truth values representing the state of the board before a move is made,Īnd let q 0.q 14 be the truth values representing the state of the board after the move Consider the following board numbering scheme, for instance: Transition in the game as a conjunction of several boolean conditions that must be met in order for the move The general idea behind encoding peg solitaire as a boolean expression is to represent each possible move or Turning peg solitaire into a boolean expression Typically in the initial board configuration, all holes have pegs except one ideally, the one initiallyĮmpty hole should be the only peg with a hole in the final state. Below is an example of a board configuration and move transition:įigure 1: Sample board configuration and move. The object of the game is to remove all pegs from theīoard except one. Game ends when no more legal "jumps" may be made. The original peg is moved to the empty hole and the adjacent "jumped" peg is removed from the board. Select one of the pegs on the board which has an adjacent peg and an empty hole following that adjacent peg. Peg solitaire describes a general class of peg-jumping games in which a player is initially presented withĪ board containing holes and wooden pegs filling a subset of these holes. An alternative rule-based encoding scheme.Encoding peg solitaire in Conjuctive Normal Form (CNF).Turning peg solitaire into a boolean expression.
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First, become a collaborator on your repository (see above), then replace our license file (license.txt) with an open source license of your choice. What if I want to release my source code under an open source license? If that's the case, please email Gwenan Spearing at with a link to the repository and details of the error, and it will be fixed as soon as possible. However, with a lot of books to take care of, it's possible that something got missed. We've made every effort to ensure that code is migrated to GitHub as a complete package, exactly as you submitted it to us. There's a problem with my book's repository on GitHub. We also recommend the excellent book, Pro Git, written by Scott Chacon and Ben Straub and published by Apress, and available online here. GitHub includes detailed help documents at. Information for AuthorsĬan I be added as a collaborator to my book's repository on GitHub?Ībsolutely! Please contact your coordinating editor and include your GitHub username, and a link to the repository. Also, Read 100+ Machine Learning Projects Solved and Explained. Somehow this follows the use of data structures and algorithms as we are going to add contacts to the book and find them using the person’s name. Only changes that are approved by the author will be accepted. Creating a contact book is a great project for someone who is at an intermediate level in Python. Please note that if your commit message is not clear, the correction will not be accepted. Include a commit message describing the correction. Create a new branch on which to make your change.Fork the repository for the relevant book.However, under fair use we encourage you to make use of the GitHub platform to directly contribute minor corrections and updates for the benefit of the authors and other readers. This means that you are not allowed to reuse it for commercial or educational purposes (e.g. If you have any problems accessing the source code for an Apress book, email How can I contribute?Ĭopyright for Apress source code belongs to the author(s) of the relevant book. If for any reason you want to get hold of the original source code, exactly as it is in your copy of the book, you can go to /releases and download release v1.0. That means that if there are any corrections, you will always get the latest version. Source code can be continuously updated after a book has published. Once you have located the repository you want, download the code as a zip using the green button, or, if you have a GitHub account, you can clone it to your machine using Git.In the Find repositories search field, enter the book’s ISBN, author surname, or book title. If your book’s GitHub repository URL is not listed in the book itself, you can find it by doing the following: You do not need a GitHub account to access our source code, but we recommend signing up to make the most of this service. Read this page to find out more about this project, and how you can contribute. If entry_to_delete in ():įor name, number in code for Apress books is on GitHub, where it can be continuously updated. Print(search, " : ", self.phonebook)Įntry_to_delete = input("ENTER NAME OF ENTRY TO DELETE: ") Search = input("ENTER NAME TO SEARCH FOR: ") #Prompt the user for the name to search for, and search the phonebook dictionary #Print out the entire phonebook dictionaryįor name, number in (): #Create a string to be written to the file #Prompt the user for the details of the new entry #Load all of the items from the text file into the dictionary It only seems to run in idle though - when I run the actual python file - the menu doesn't work. I'd be grateful if y'all could give me some tips and ways to improve on it/make it more efficient :) So to refresh my memory and have a bit of a practice I wrote a quick phone-book program. I got bored of revision last night, and decided to have another go at python! Select Modify Security Settings to enter and set your MySQL Server (root) access password.Note: If you choose not to install the MySQL Server as a Windows Service, you will need to ensure that the database service has been started before running Confluence. Refer to the MySQL documentation for further information. If your hardware is going to be used as a dedicated MySQL Server, you may wish to choose the options to Install As Windows Service (and Launch the MySQL Server automatically). For the Windows configuration option, choose whether or not to install the MySQL Server as a Windows service.For more information, see Configuring Database Character Encoding. This will ensure Confluence's support for internationalization. For the MySQL server's default character set, choose Best Support For Multilingualism (in other words, UTF-8).Refer to the MySQL documentation on setting the networking and server SQL modes for further information. For the networking options, ensure the Enable TCP/IP Networking and Enable Strict Mode options are selected (default).You can use one of the presets or enter a number manually. Set the approximate number of concurrent connections permitted to suit your Confluence usage requirements.Set the InnoDB Tablespace settings to your requirements.Using the MyISAM storage engine can lead to data corruption in Confluence. You must use the InnoDB storage engine with Confluence. Choose Transactional Database Only to ensure that your MySQL database will use InnoDB as its default storage engine.This will affect the MySQL Server's usage of memory, disk and CPU resources. 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