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Figure 1-1 A Randomly Planned House Object-oriented programming works much better when it is used together with an object-oriented analysis and design process (OOAD) Trying to write an OO program without first going through the analysis and design steps is like trying to build a house without first analyzing the requirements of the house, designing it, and producing a set of blueprints You might end up with a roof over your head, but the rooms would likely be scattered all over the place, some rooms might be missing, and the whole thing would probably come tumbling down on your head during the first storm (Figure 1-1) An OO program in any programming language written without at least some OOAD might seem to work, but it is much more likely to be full of bugs, and break when you make the first modification

Related to library reorganization, all import statements appearing in submodules of a package use absolute namesThis is covered in more detailed in 8, Modules, Packages, and Distribution, but suppose you have a package organized like this:

Data retrieved: The players who participate in the specified sport Finder method:

foo/

If the file spampy uses the statement import bar, you get an ImportError exception even though barpy is located in the same directoryTo load this submodule, spampy either needs to use import foobar or a package relative import such as from import bar This differs from Python 2 where import always checks the current directory for a match before moving onto checking other directories in syspath

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Converting code from Python 2 to Python 3 is a delicate topic Just to be absolutely clear, there are no magic imports, flags, environment variables, or tools that will enable Python 3 to run an arbitrary Python 2 program However, there are some very specific steps that can be taken to migrate code, each of which is now described

Description: The persistent field belongs to the bean To reach the field, the query must first navigate from the bean to the bean ( ) and then from the bean to the bean ( ) Because the relationship field is not a collection, it may be persistent field followed by the

Objects are the heart of object orientation An object is a representation of almost anything you need to model in a program An object can be a model of an employee, a representation of a

It is recommended that anyone porting code to Python 3 first port to Python 26 Python 26 is not only backwards-compatible with Python 25, but it also supports a subset of new features found in Python 3 Examples include advanced string formatting, the new exception syntax, byte literals, I/O library, and abstract base classesThus, a

Python 2 program can start to take advantage of useful Python 3 features now even if it is not yet ready to make the full migration The other reason to port to Python 26 is that Python 26 issues warning messages for deprecated features if you run it with the -3 command-line option For example:

Every clause must specify a conditional expression, of which there are several kinds In the previous examples, the conditional expressions are comparison expressions that test for equality The following examples demonstrate some of the other kinds of conditional expressions For descriptions of all conditional expressions, see the section WHERE Clause, page (182)

bash-32$ python -3 Python 26 (trunk:66714:66715M, Oct 1 2008, 18:36:04) [GCC 401 (Apple Computer, Inc build 5370)] on darwin Type "help", "copyright", "credits" or "license" for more information >>> a = { } >>> ahas_key('foo') _ _main_ _:1: DeprecationWarning: dicthas_key() not supported in 3x; use the in operator False >>

Using these warning messages as a guide, you should take great care to make sure that your program runs warning-free on Python 26 before moving forward with a Python 3 port

file:///C|/oobook/1html (2 of 7) [13/03/2003 02:55:04 }

Python has useful testing modules including doctest and unittest Make sure your application has thorough test coverage before attempting a Python 3 port If your program has not had any tests to this point, now would be a good time to startYou will want to make sure your tests cover as much as possible and that all tests pass without any warning messages when run on Python 26

Finder method:

Python 3 includes a tool called 2to3 that can assist with code migration from Python 26 to Python 3This tool is normally found in the Tools/scripts directory of the Python source distribution and is also installed in the same directory as the python30 binary on most systems It is a command-line tool that would normally run from a UNIX or Windows command shell As an example, consider the following program that contains a number of deprecated features

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