dist.py 文件源码

def check_nsp(dist, attr, value):
    """Verify that namespace packages are valid"""
    assert_string_list(dist, attr, value)
    for nsp in value:
        if not dist.has_contents_for(nsp):
            raise DistutilsSetupError(
                "Distribution contains no modules or packages for " +
                "namespace package %r" % nsp
            )
        if '.' in nsp:
            parent = '.'.join(nsp.split('.')[:-1])
            if parent not in value:
                distutils.log.warn(
                    "WARNING: %r is declared as a package namespace, but %r"
                    " is not: please correct this in setup.py", nsp, parent
                )