fetch.py

#!/usr/bin/env python3

"""
https://opac.perpusnas.go.id/uploaded_files/dokumen_isi3/Terbitan%20Berkala/PERTJATOERAN_19[26-31]_[Januari|Februari|Maret|April|Mei|Juni|Juli|Agustus|September|Oktober|November|Desember]_03_Tahun_[III|IV|V|VI|VII]_No_[1-150]_001.pdf.
"""

import requests

month_names = "Januari|Februari|Maret|April|Mei|Juni|Juli|Agustus|September|Oktober|November|Desember"

date_range = [1926, 1931]

roman_numeral = "III|IV|V|VI|VII"

range_no = [1,150]

predict_url = "https://opac.perpusnas.go.id/uploaded_files/dokumen_isi3/Terbitan Berkala/PERTJATOERAN_%s_%s_03_Tahun_%s_No_%s_001.pdf"

for i in range(date_range[0], date_range[1]):
    for m in month_names.split('|'):
        for r in roman_numeral.split('|'):
            for j in range(range_no[0], range_no[1]):
                url = (predict_url % (str(i),m,r,str(j))).replace(' ', '%20')
                print(url)
                req = requests.get(url)
                if req.status_code == 200:
                    print('Found ', url)
                    fname = url.split('/')[-1]
                    with open(fname, 'wb') as fh:
                        fh.write(req.content)
                else:
                    print('Not found', url)