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The global variables we use in this application are a set of operations and their corresponding functions, and a value indicating how many times (three: 0, 1, 2) we allow the user to enter an incorrect answer before we reveal the solution. The function dictionary uses the operator's symbol to index into the dictionary, pulling out the appropriate arithmetic function.


Last updated on 9/14/2001
Core Python Programming, © 2002 Prentice Hall PTR

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© 2002, O'Reilly & Associates, Inc.