1 import requests
2 import json
3
4 search_url = "https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&mindate=1800/01/01&maxdate=2016/12/31&usehistory=y&retmode=json"
5 search_r = requests.post(search_url)
6 search_data = search_r.json()
7 webenv = search_data["esearchresult"]['webenv']
8 total_records = int(search_data["esearchresult"]['count'])
9 fetch_url = "https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&retmax=9999&query_key=1&webenv="+webenv
10
11 for i in range(0, total_records, 10000):
12 this_fetch = fetch_url+"&retstart="+str(i)
13 print("Getting this URL: "+this_fetch)
14 fetch_r = requests.post(this_fetch)
15 f = open('pubmed_batch_'+str(i)+'_to_'+str(i+9999)+".json", 'w')
16 f.write(fetch_r.text)
17 f.close()
18
19 print("Number of records found :"+str(total_records))
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