Basic Subdomain Lister based on https://github.com/PaulSec/crt.sh

subdomainLister.py

import subprocess
import sys                
import json
import requests, json

"""
Unoffical cert.sh API from https://github.com/PaulSec/crt.sh 
"""

class crtshAPI(object):
    """crtshAPI main handler."""
    def search(self, domain, wildcard=True):
        base_url = "https://crt.sh/?q={}&output=json"
        if wildcard:
            domain = "%25.{}".format(domain)
        url = base_url.format(domain)

        ua = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.1'
        req = requests.get(url, headers={'User-Agent': ua})

        if req.ok:
            try:
                content = req.content.decode('utf-8')
                data = json.loads("[{}]".format(content.replace('}{', '},{')))
                return data
            except Exception as err:
                print("Error retrieving information.")
        return None



"""
AND THIS IS MY CODE
"""

if(len(sys.argv) == 1 or len(sys.argv) > 2  ):
    print("*"*20+"\nUSAGE\npython "+sys.argv[0]+" theSite.com\n"+"*"*20)
    sys.exit()

site = sys.argv[1]
result = []

f= open("./output_"+site+".txt","a+")
out =json.dumps(crtshAPI().search(site))
data = json.loads(out)
j = data[0]

for i in range(len(j)):
    result.append(json.dumps(j[i]['name_value']).strip('"'))

result= list(dict.fromkeys(result))

for at in result:
    #print(at) Console output
    f.write(at+'\r\n')