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# plot2dpy from Primitives import lines
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Here, the moves out one directory level and Primitives drops down into a different package directory Relative imports can only be specified using the from module import symbol form of the import statementThus, statements such as import Primitiveslines or import lines are a syntax error Also, symbol has to be a valid identifier So, a statement such as from import Primitiveslines is also illegal Finally, relative imports can only be used within a package; it is illegal to use a relative import to refer to modules that are simply located in a different directory on the filesystem Importing a package name alone doesn t import all the submodules contained in the package For example, the following code doesn t work:
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import Graphics GraphicsPrimitivefillfloodfill(img,x,y,color) # Fails!
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However, because the import Graphics statement executes the _ _init_ _py file in the Graphics directory, relative imports can be used to load all the submodules automatically, as follows:
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# Graphics/_ _init_ _py from import Primitive, Graph2d, Graph3d # Graphics/Primitive/_ _init_ _py from import lines, fill, text,
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Now the import Graphics statement imports all the submodules and makes them available using their fully qualified names Again, it is important to stress that a package relative import should be used as shown If you use a simple statement such as import module, standard library modules may be loaded instead Finally, when Python imports a package, it defines a special variable, _ _path_ _, which contains a list of directories that are searched when looking for package submodules (_ _path_ _ is a package-specific version of the syspath variable) _ _path_ _ is accessible to the code contained in _ _init_ _py files and initially contains a single item with the directory name of the package If necessary, a package can supply additional directories to the _ _path_ _ list to alter the search path used for finding submodules This might be useful if the organization of a package on the file system is complicated and doesn t neatly match up with the package hierarchy
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8 Modules, Packages, and Distribution
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To distribute Python programs to others, you should use the distutils module As preparation, you should first cleanly organize your work into a directory that has a README file, supporting documentation, and your source codeTypically, this directory will contain a mix of library modules, packages, and scripts Modules and packages refer to source files that will be loaded with import statements Scripts are programs that will run as the main program to the interpreter (eg, running as python scriptname) Here is an example of a directory containing Python code:
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spam/ READMEtxt Documentationtxt libspampy spampkg/ _ _init_ _py foopy barpy runspampy
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# A single library module # A package of support modules
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# A script to run as: python runspampy
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You should organize your code so that it works normally when running the Python interpreter in the top-level directory For example, if you start Python in the spam directory, you should be able to import modules, import package components, and run scripts without having to alter any of Python s settings such as the module search path After you have organized your code, create a file setuppy in the top most directory (spam in the previous examples) In this file, put the following code:
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# setuppy from distutilscore import setup setup(name = "spam", version = "10", py_modules = ['libspam'], packages = ['spampkg'], scripts = ['runspampy'], )
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In the setup() call, the py_modules argument is a list of all of the single-file Python modules, packages is a list of all package directories, and scripts is a list of script files Any of these arguments may be omitted if your software does not have any matching components (ie, there are no scripts) name is the name of your package, and version is the version number as a string The call to setup() supports a variety of other parameters that supply various metadata about your packageTable 81 shows the most common parameters that can be specified All values are strings except for the classifiers parameter, which is a list of strings such as ['Development Status :: 4 - Beta', 'Programming Language :: Python'] (a full list can be found at http://pypipythonorg)
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