import syntax for the latter caseand import from another directory when testing interactivelyc:\pp \lang\parserparser py parser rest is same as for parser :pp \lang\parserpython import parser from scanner import scannersyntaxerrorlexicalerror valueerrorattempted relative import in non-package from pytree :\pp \lang\parsercd :\pp \langparser\parser py parser rest is same as for parser :\pp \langpython from parser import parser parser parser( parse(' ' import parser testparser parser testparser interact(parser parserenter= enter=stop using full package import paths in parser instead of either package-relative or unqualified importsfrom pp lang parser import scanner would suffice for all three use cases--scriptand both same and other directory imports--but requires the path to be set properlyand seems overkill for importing file in the same directory as the importer parse tree structure reallythe only tangible difference with this latest parser is that it builds and uses trees to evaluate an expression internally instead of evaluating as it parses the intermediate representation of an expression is tree of class instanceswhose shape reflects the order of operator evaluation this parser also has logic to print an indented listing of the constructed parse tree if the traceme attribute is set to true (or indentation gives the nesting of subtreesand binary operators list left subtrees first for examplec:\pp \langfrom parser import parser text and language