convert ALIAS records for all of your DNSimple domains to A records, including a TXT record to identify which domains were converted. The TXT record will allow automated reversal at a later date. The actual add/delete functions are commented here to allow you to run in "safe mode" first.

gistfile1.py

#!/usr/bin/python
from dnsimple import DNSimple
import socket

dns = DNSimple(email='foo@bar.com', api_token='your_token_here')

domains = dns.domains()

for domain in domains:
    dname = domain['domain']['name']

    print 'checking %s' % (dname)
    records = dns.records(dname)

    for record in records:
        rtype = record['record']['record_type']
        if rtype == 'ALIAS':
            print '%s has ALIAS record' % (dname)

            rid = record['record']['id']
            aliastarget = record['record']['content']
            targetip = socket.getaddrinfo(aliastarget, None)[0][4][0]

            newrecord = { 'record_type': 'A', 'name': '', 'content': targetip }
            placeholder = { 'record_type': 'TXT', 'name': 'backout', 'content': 'yes' }

            print '  create A record: %s => %s' % (dname, targetip)
#            dns.add_record(dname, newrecord)
            print '  delete ALIAS record for %s' % (dname)
#            dns.delete_record(dname, rid)
            print '  create TXT record for later reversal of this change'
#            dns.add_record(dname, placeholder)