Path.py

import os.path

class Path:
    def __init__(self, path = os.path.curdir):
        assert isinstance(path, str) or isinstance(path, self.__class__)
        if isinstance(path, str):
            self.path = path
        else:
            self.path = path.path

    def __str__(self):
        return self.path

    def __add__(self, other):
        assert isinstance(other, str) or isinstance(other, self.__class__)
        if isinstance(other, str):
            return self.__class__(os.path.join(self.path, other))
        else:
            return self.__class__(os.path.join(self.path, other.path))

    def __iadd__(self, other):
        assert isinstance(other, str) or isinstance(other, self.__class__)
        if isinstance(other, str):
            self.path = os.path.join(self.path, other)
        else:
            self.path = os.path.join(self.path, other.path)
        return self

    @property
    def abspath(self):
        return self.__class__(os.path.abspath(self.path))

    @property
    def basename(self):
        return self.__class__(os.path.basename(self.path))

    @property
    def dirname(self):
        return self.__class__(os.path.dirname(self.path))

    @property
    def expanduser(self):
        return self.__class__(os.path.expanduser(self.path))

    @property
    def normpath(self):
        return self.__class__(os.path.normpath(self.path))

    @property
    def realpath(self):
        return self.__class__(os.path.realpath(self.path))

    @property
    def relpath(self):
        return self.__class__( os.path.relpath(self.path))

    def join(self, *p):
        return self.__class__( os.path.join(self.path, *p))