Python-style string interpolation

Classes
		Engine EvalDict   class Engine       Methods defined here: compileFile(self, fp, template_name, get_template) compileString(self, source, template_name, get_template) dump(self, program) interpret(self, program, fp, globals, locals, get_template) load(self, s) Data and other attributes defined here: type = 'pysi'   class EvalDict       Methods defined here: __getitem__(self, key) __init__(self, globals, locals)