ncbi epost out of order

gistfile1.py

ids = ["148908191", "297793721", "48525513", "507118461"]
search_results = Entrez.read(Entrez.epost("protein", id=','.join(ids)))
webenv = search_results["WebEnv"]
query_key = search_results["QueryKey"] 
print Entrez.read(Entrez.elink(webenv=webenv, 
                         query_key=query_key,
                         dbfrom="protein",
                         db="taxonomy"))

print "-------"

for i in ids:
    search_results = Entrez.read(Entrez.epost("protein", id=i))
    webenv = search_results["WebEnv"]
    query_key = search_results["QueryKey"] 
    print Entrez.read(Entrez.elink(webenv=webenv, 
                         query_key=query_key,
                         dbfrom="protein",
                         db="taxonomy"))

#[{u'LinkSetDb': [{u'DbTo': 'taxonomy', u'Link': [{u'Id': '211604'}, {u'Id': '81972'}, {u'Id': '32630'}, {u'Id': '3332'}], u'LinkName': 'protein_taxonomy'}], u'DbFrom': 'protein', u'IdList': ['148908191', '297793721', '48525513', '507118461'], u'LinkSetDbHistory': [], u'ERROR': []}]
#-------
#[{u'LinkSetDb': [{u'DbTo': 'taxonomy', u'Link': [{u'Id': '3332'}], u'LinkName': 'protein_taxonomy'}], u'DbFrom': 'protein', u'IdList': ['148908191'], u'LinkSetDbHistory': [], u'ERROR': []}]
#[{u'LinkSetDb': [{u'DbTo': 'taxonomy', u'Link': [{u'Id': '81972'}], u'LinkName': 'protein_taxonomy'}], u'DbFrom': 'protein', u'IdList': ['297793721'], u'LinkSetDbHistory': [], u'ERROR': []}]
#[{u'LinkSetDb': [{u'DbTo': 'taxonomy', u'Link': [{u'Id': '211604'}], u'LinkName': 'protein_taxonomy'}], u'DbFrom': 'protein', u'IdList': ['48525513'], u'LinkSetDbHistory': [], u'ERROR': []}]
#[{u'LinkSetDb': [{u'DbTo': 'taxonomy', u'Link': [{u'Id': '32630'}], u'LinkName': 'protein_taxonomy'}], u'DbFrom': 'protein', u'IdList': ['507118461'], u'LinkSetDbHistory': [], u'ERROR': []}]

See also https://www.biostars.org/p/112225/ and https://stackoverflow.com/questions/25775309/entrez-epost-elink-returns-results-out-of-order-with-biopython