Grail is an extensible Internet browser written entirely in the interpreted object-oriented programming language Python. It runs on Unix, and, to some extent, on Windows and Macintosh. Grail is easily extended to support other new protocols or file formats. Grail is distributed in source form, free of change, without warranties. It requires recent versions of Python and Tcl/Tk to run.
This is the official documentation for the Python programming language. It includes a tutorial and reference material on the language and the libraries, extending the interpreter with C, and producing and installing additional Python packages. The documents are available online and in downloadable packages; formats include HTML, PostScript, and PDF.