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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_repo(path=None, alias=None, create=False):
 """ Returns ``Repository`` object of type linked with given ``alias`` at the specified ``path``. If ``alias`` is not given it will try to guess it using get_scm method """

    if create:
        if not (path or alias):
            raise TypeError("If create is specified, we need path and scm type")
        return get_backend(alias)(path, create=True)
    if path is None:
        path = abspath(os.path.curdir)
    try:
        scm, path = get_scm(path, search_up=True)
        path = abspath(path)
        alias = scm
    except VCSError:
        raise VCSError("No scm found at %s" % path)
    if alias is None:
        alias = get_scm(path)[0]

    backend = get_backend(alias)
    repo = backend(path, create=create)
    return repo