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We mentioned earlier that each statement encountered in a py le is executed in turn, starting with the rst one and progressing line by line The ow of control can be diverted by a function or method call or by a control structure, such as a conditional branch or a loop statement Control is also diverted when an exception is raised In this subsection we will look at Python s if statement and its while and for loops, deferring consideration of functions to Piece #8, and methods to 6 We will also look at the very basics of exception-handling; we cover the subject fully in 4 But rst we will clarify a couple of items of terminology A Boolean expression is anything that can be evaluated to produce a Boolean value (True or False) In Python, such an expression evaluates to False if it is the prede ned constant False, the special object None, an empty sequence or collection (eg, an empty string, list, or tuple), or a numeric data item of value 0; anything else is considered to be True When we create our own custom data types (eg, in 6), we can decide for ourselves what they should return in a Boolean context In Python-speak a block of code, that is, a sequence of one or more statements, is called a suite Because some of Python s syntax requires that a suite be present, Python provides the keyword pass which is a statement that does nothing and that can be used where a suite is required (or where we want to indicate that we have considered a particular case) but where no processing is necessary

A good solution should make it simple to express the ordering constraints The ordering constraints in this problem are simple and regular and lend themselves to being expressed in terms of data flowing through a pipeline The target platform can include special purpose hardware that can perform some of the desired operations In some applications, future additions, modifications, or reordering of the stages in the pipeline are expected In some applications, occasional items in the input sequence can contain errors that prevent their processing

The rst two exercises involve modifying classes we covered in this chapter, and the last two exercises involve creating new classes from scratch 1 Modify the Point class (from Shapepy or ShapeAltpy), to support the following operations, where p, q, and r are Points and n is a number:

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Imagine, for a moment, that you have to take your car to a mechanic because it has a problem whose cause you cannot determine All you know is that the car makes a sound it hasn t made before, and you know it can t be

p p p p p p p p p p = q + r += q = q - r -= q = q * n *= n = q / n /= n = q // n //= n # # # # # # # # # # Point__add__() Point__iadd__() Point__sub__() Point__isub__() Point__mul__() Point__imul__() Point__truediv__() Point__itruediv__() Point__floordiv__() Point__ifloordiv__()

The in-place methods are all four lines long, including the def line, and the other methods are each just two lines long, including the def line, and of course they are all very similar and quite simple With a minimal description and a doctest for each it adds up to around one hundred thirty new lines A model solution is provided in Shape_anspy; the same code is also in ShapeAlt_anspy 2 Modify the Imagepy class to provide a resize(width, height) method If the new width or height is smaller than the current value, any colors outside the new boundaries must be deleted If either width or height is None then use the existing width or height At the end, make sure you regenerate the self__colors set Return a Boolean to indicate whether a change was made or not The method can be implemented in fewer than 20 lines (fewer than 35 including a docstring with a simple doctest) A solution is provided in Image_anspy 3 Implement a Transaction class that takes an amount, a date, a currency (default USD US dollars), a USD conversion rate (default 1), and a description (default None) All of the data attributes must be private Provide the following read-only properties: amount, date, currency, usd_conversion_rate, description, and usd (calculated from amount * usd_conversion_rate) This class can be implemented in about sixty lines including some simple doctests A model solution for this exercise (and the next one) is in le Accountpy 4 Implement an Account class that holds an account number, an account name, and a list of Transactions The number should be a read-only prop-

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6 Object-Oriented Programming erty; the name should be a read-write property with an assertion to ensure that the name is at least four characters long The class should support the built-in len() function (returning the number of transactions), and should provide two calculated read-only properties: balance which should return the account s balance in USD and all_usd which should return True if all the transactions are in USD and False otherwise Three other methods should be provided: apply() to apply (add) a transaction, save(), and load() The save() and load() methods should use a binary pickle with the lename being the account number with extension acc; they should save and load the account number, the name, and all the transactions This class can be implemented in about ninety lines with some simple doctests that include saving and loading use code such as name = ospathjoin(tempfilegettempdir(), account_name) to provide a suitable temporary lename, and make sure you delete the temporary le after the tests have nished A model solution is in le Accountpy

Writing and Reading Binary Data Writing and Parsing Text Files Writing and Parsing XML Files Random Access Binary Files

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