Check socks4 and socks5 proxies [Python, Curl]

#!/usr/bin/python3

"""This checks socks4 and socks5 and socks4 proxies using curl.
It is necessary to make a proxies.txt file and put the urls in this form:
sockstype://ip:port ex socks5://127.0.0.1:9050"""

import subprocess as sub
import time

timeout = "5"
debug = False

check_hosts = [
    "ifconfig.me",
    "api.ipify.org",
    "bot.whatismyipaddress.com",
    "ipinfo.io/ip",
    "ipecho.net/plain"
    ]
def log_good(string):
    with open("good_proxies.txt","a") as good_proxies:
        good_proxies.write(string)
        good_proxies.close()

proxies = open("proxies.txt", "r").read().split("\n")
total = len(proxies)

for i, ip in enumerate(proxies):
    if not i=="":
        try:
            print(f"{i}/{total} Checking {ip}")
            sockstype, ip = ip.split("://")
            t1 = time.time()
            result = sub.check_output(["curl","-s","--connect-timeout",timeout,f"--{sockstype}",ip,check_hosts[0]])
            if debug == True:print(f"curl -s --connect-timeout {timeout} --{sockstype} {ip} {check_hosts[0]}")
            t2 = time.time()
            total_time = t2 - t1
            print(f"{ip} responded in {t2 - t1} seconds")
            log_good(f"{sockstype}://{ip} {round(total_time,1)}\n")
        except Exception as e:
            if debug == True:
                print(f"curl -s --connect-timeout {timeout} --{sockstype} {ip} {check_hosts[0]}")
                print(e)
                print("\n")
            pass