template.py

#import requests
#import json
#r = requests.get('http://webconcepts.info/concepts/http-status-code.json')
#codes = r.json()
#keys = { i['value']: i['description'] for i in codes["values"] }
#data = json.dumps(keys)

data = {
    "400": "Bad Request",
    "401": "Unauthorized",
    "402": "Payment Required",
    "403": "Forbidden",
    "404": "Not Found",
    "405": "Method Not Allowed",
    "406": "Not Acceptable",
    "407": "Proxy Authentication Required",
    "408": "Request Timeout",
    "409": "Conflict",
    "410": "Gone",
    "411": "Length Required",
    "412": "Precondition Failed",
    "413": "Payload Too Large",
    "414": "URI Too Long",
    "415": "Unsupported Media Type",
    "416": "Range Not Satisfiable",
    "417": "Expectation Failed",
    "418": "I'm a teapot",
    "421": "Misdirected Request",
    "422": "Unprocessable Entity",
    "423": "Locked",
    "424": "Failed Dependency",
    "425": "Too Early",
    "426": "Upgrade Required",
    "428": "Precondition Required",
    "429": "Too Many Requests",
    "431": "Request Header Fields Too Large",
    "451": "Unavailable For Legal Reasons",
    "500": "Internal Server Error",
    "501": "Not Implemented",
    "502": "Bad Gateway",
    "503": "Service Unavailable",
    "504": "Gateway Timeout",
    "505": "HTTP Version Not Supported",
    "506": "Variant Also Negotiates",
    "507": "Insufficient Storage"
}

for k,v in data.items():
    with open('template.html') as f:
        html_content = f.read().replace('__CODE__', k).replace('__DESCRIPTION__', v).replace('__TITLE__',f'{k} {v}')
        with open(f'{k}.html', 'w') as output_file:
            output_file.write(html_content)