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Safari | Python Developer's Handbook -> The Interpreter





< BACKMake Note | BookmarkCONTINUE >
152015024128143245168232148039196038240039088173205162105045222218069155135243164165048

The Interpreter

The JPython installation places several files on your system, including a set of modules, some sample programs, an application called jpythonc (which we will see later), and the JPython interpreter.

The JPython interpreter looks very similar to the CPython interpreter (see Figure 18.2). However, jpython is not a binary file, but a short script (or batch file, depending on your system) that invokes your local JVM, sets the Java property install.path to an appropriate value, and then runs the Java class file org.python.util.jpython.

Figure 18.2. If you glance at this screen, you might be confused whether JPython or CPython is running because both interpreters do look alike.
graphics/18fig02.gif

The following syntax shows the possible options that you can pass to JPython when invoking it from the shell. A list of options is shown in Table 18.1.

					
jpython [options] [-jar jar | -c cmd | file | -] [args]

				

Table18.1. List of the Interpreter Options and Arguments
Option Description
-i Inspects interactively after running script and forces prompts, even if stdin does not appear to be a terminal.
-S Doesn't imply import site on initialization.
-X Disables class based standard exceptions.
-Dprop=value Sets the Java property prop to value.
-jar jar Runs the program that is read from the __run__.py file in the specified jar file.
-c cmd Runs the program passed in as the cmd string. This option terminates the options list.
file Runs file as the program script.
- Reads the program from standard input. This flag allows you to pipe a file into Jpython and have it treated correctly.
--help Prints a usage message and exits.
--version Prints JPython version number and exits.
args Passes a list of arguments to the program in the sys.argv[1:] variable.

Because jpython is not a binary executable, but a simple script, you have to add the following line to the top of your JPython programs (only if you have a UNIX system), in order to make them executable.

					
#! /usr/bin/env jpython

				

Using something like #!/usr/bin/jpython/jpython will not work because this syntax requires jpython to be a binary executable (which is not the case).

You also need to make sure that jpython's directory is registered on your PATH variable.

Now let's take a look at the following code:

					
class jhello:
   def main(argv):
        print "Hello Python world!"

myapp=jhello()
myapp.main()

				

After saving this code in a file, called jhello.py, you can execute it by typing at your OS prompt:

					
jpython jhello.py

				


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

< BACKMake Note | BookmarkCONTINUE >

Index terms contained in this section

[nd] option
[nd]c cmd option
[nd]Dprop=value option
[nd]file option
[nd]I option
[nd]jar jar option
[nd]S option
[nd]X option
args option
arguments
      JPython interpreter
options
      JPython interpreter

2002, O'Reilly & Associates, Inc.

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