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Safari | Python Developer's Handbook -> Interpreter





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Interpreter

After installing Python, some special environment variables can be configured in order to guarantee the maximum usage of the Python environment. The following list shows some important environment variables recognized by the Python interpreter.

PYTHONPATH This variable contains a list of directories used by the interpreter, as search path, when importing modules. The best installation strategy is to put extra Python modules in the /lib/python$(ver)/site-packages subdirectory under the root Python installation, so you can tell between standard Python packages and add-ons. Then you just need to set PYTHONPATH to your Python search path.

PYTHONSTARTUP This variable contains the name of the directory that must have all its files automatically loaded at the time of starting the Python interpreter.

PATH(or path) This is a system environment variable that contains the directory where the Python interpreter is located.

TCL_LIBRARY, TK_LIBRARY These variables set the names of the directories where we can find the libraries for both the Tcl and Tk systems. You don't need to set these variables unless you move your Tcl or Tk files after building and installing them (the same as for Python).

Each system has a different way to set up these variables. For example, UNIX users running all bourne shell compatible shells, could type

					
PYTHONPATH=".:/usr/local/python/lib"
export PYTHONPATH

				

On the other hand, Windows and DOS users are familiar with the following syntax:

					
set PYTHONPATH=.;c:\ python\ lib

				

The Macintosh people must use the EditPythonPrefs program that comes along with their version of the Python distribution. Note that this application is also used to set up the values for the command line options that are passed to the interpreter.

When your system is able to locate the Python installation, you can call the interpreter by typing the command

					
python

				

invoking the interpreter without arguments, connecting the standard input to a tty device, executing commands interactively.

					
python filename

				

If you inform a filename, the interpreter tries to read and execute the contents of the file.

The next line shows the general syntax to start up the Python interpreter.

					
python [options] [-c cmd | filename | -] [file_arguments]

				

The command line options in Table 17.5 are available on Windows and UNIX systems.

Table17.5. Python Interpreter Command Line Options
Option Description
-d Generates parser debugging information.
-i Enters interactive mode after program execution.
-O Sets optimized mode that optimizes bytecompiled files.
-OO Acts like -O, but also strips docstrings.
-S Prevents inclusion of the site initialization module.
-t Reports warnings about inconsistent tab usage.
-u Sets unbuffered binary stdout and stdin.
-v Sets the verbose mode.
-x Skips the first line of the source program.
-X Disables class-based exceptions. Note that release 2.0 doesn't contain this option anymoreit has been removed. Standard exceptions cannot be strings anymore. They always have to be classes. Also note that since release 2.0 the exceptions module was converted from Python to a built-in C module.
-c cmd Executes the provided Python command cmd. It's important to use double quotes here because the Python command can contain spaces.
- using - as a filename makes the interpreter read from the standard input.

Note

Note that Python 2.0 brings the new -U command line option to you. This option tells the Python compiler to interpret all 8-bit string literals as Unicode string literals. You should hang on to this one as the support for 8-bit stri ... ... (Not finished, please download and read the complete file)

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Sorry!This guy is mysterious, its blog hasn't been opened, try another, please!
OK

Warm tip!

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