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Safari | Python Developer's Handbook -> jpythonc 





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jpythonc

The JPython distribution provides a tool called jpythonc that works like a Python compiler for Java. This tool, which is actually just a JPython script, operates by taking a JPython source code (extension .py), and compiling it to real Java class bytecodes, which are executed by the Java Runtime Environment (JRE). Therefore you can write your code in JPython, and later use jpythonc to generate a simple class, a JavaBean, a servlet, or an applet. Note that you need full access to a Java compiler in order to use jpythonc. Internally, the jpythonc tool creates a Java source file file, but it needs an external compiler to generate the compiled Java .class file.

Check the installation directory where you installed the JPython package. That's where the tool is located.

The jpythonc tool is very useful for embedding your JPython application in a Java application. After you generate the .class file, you are able to subclass Python classes in Java, and also to create JavaBeans, Servlets, and Applets from a Python class file.

The jpythonc script accepts several command line options, as listed next. The general format of the command's syntax is as follows:

					
jpythonc [options] [module]*

				

The available options are listed as follows. Note that the information provided between parenthesis shows a short way to say the same thing that the long name's option says.

--package package (-p package) Puts all compiled code into the named Java package.

--jar jarfile (-j jarfile) Specifies a .jar file to create and put the results of the freeze into. This option implies the --deep option.

--deep (-d) Compiles all Python dependencies of the module. This is used for creating applets.

--core (-c) Includes the core JPython libraries (about 130K). Needed for applets because Netscape doesn't yet support multiple archives. This option implies the --deep option.

--all (-a) Includes all the JPython libraries (everything in core + compiler and parser). This option implies the --deep option.

--bean jarfile (-b jarfile) Compiles into jarfile, including the correct manifest for the bean.

--addpackages pkgs (-A pkgs) Includes Java dependencies from this list of packages. Default is org.python.modules and com.oroinc.text.regex.

--workdir directory (-w directory) Specifies the working directory where the generated Java source code is placed. The default value is ./jpywork.

--skip modules (-s modules) Doesn't include any of these modules in compilation. This is a comma-separated list of modules.

--compiler path (-C path) Uses a compiler different from javac. If this is set to NONE, compiles end with the generation of the Java source file. Alternatively, you can set the property python.jpythonc.compiler in the registry file.

--compileropts options-- (-J options) Passes options directly to the Java compiler. Alternatively, you can set the property python.jpythonc.compileropts in the registry file.

--falsenames names (-f names) A comma-separated list of names that are always false. Can be used to short-circuit if clauses.

--help (-h) Prints a usage message and exits.

[module]* A list of Python modules to freeze. Can be either module names that are located on the python.path or .py files.

In order to create an applet, the following syntax is suggested. Note that you need to use the -core option in order to include the JPython libraries as part of the applet.

					
jpythonc -core -deep -jar <appletapp.jar> *.py

				

In order to create a simple class, the following syntax is suggested:

					
jpythonc <yourapp.py>

				

Now, if you just need to create a bean, the following syntax should be used:

					
jpythonc -deep -bean <filename.jar> <beenname>

				


Last updated on 1/30/2002
Python Developer's Handbook, © 2002 Sams Publishing

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Index terms contained in this section

applets
      creating
beans
      creating
classes
      creating
creating
      applets
      beans
      classes
JPython
      jpythonc tool
jpythonc tool
options
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