def get_tc_url(arch_string, artifact_name='native_client.tar.xz', branch_name='master'):
    assert (arch_string is not None)
    assert (artifact_name is not None)
    assert artifact_name
    assert (branch_name is not None)
    assert branch_name
    return (TASKCLUSTER_SCHEME % {'arch_string': arch_string, 'artifact_name': artifact_name, 'branch_name': branch_name})
def get_tc_url(arch_string, artifact_name='native_client.tar.xz', branch_name='master'):
    assert (arch_string is not None)
    assert (artifact_name is not None)
    assert artifact_name
    assert (branch_name is not None)
    assert branch_name
    return (TASKCLUSTER_SCHEME % {'arch_string': arch_string, 'artifact_name': artifact_name, 'branch_name': branch_name})