Download 3GPP Spec

I felt it difficult to download spec files one by one.

Here is script to download it at once.

import requests 
for i in ['401', '410', '411', '412', '413', '414', '420', '421', '422', '423', '424', '425', '440', '441', '442', '443', '444', '445', '455', '456', '457', '458', '459', '461', '462', '463', '464', '465']:
#for i in "range(400,499)":
    file_url = "https://www.etsi.org/deliver/etsi_ts/136400_136499/136" + i + "/15.00.00_60/ts_136" + i + "v150000p.pdf"
    file_name = "36." + i + "_150000p.pdf"
    #print("wget", file_url)
    r = requests.get(file_url, stream = True) 

    with open(file_name,"wb") as pdf: 
        for chunk in r.iter_content(chunk_size=1024): 

            #writing one chunk at a time to pdf file 
            if chunk: 
                pdf.write(chunk)