How to parse xml file with many xml BLAST outputs pasted into one file one by one Python

Question

How to parse xml file with many xml BLAST outputs pasted into one file one by one Python. I pasted each blast output into one xml file. They are seperated with:

<?xml version="1.0"?>
<!DOCTYPE BlastOutput PUBLIC "-//NCBI//NCBI BlastOutput/EN" 
"http://www.ncbi.nlm.nih.gov/dtd/NCBI_BlastOutput.dtd">

And each blast output starts with a root:

<BlastOutput>

My code that parse only the first blast result:

with open(xml, 'r') as out_handle:
    blast_records = NCBIXML.parse(out_handle)
    blast_record = next(blast_records)
    eval_tresh = 0.04
    for alignment in blast_record.alignments:
        for hsp in alignment.hsps:
            if hsp.expect < eval_tresh:
                print('***Alignment***')
                print('Sequence:', alignment.title)
                # print('Length:', alignment.length)
                # print('E value:', hsp.expect)

Does anyone know how I could parse those blast results one by one with bio.python?