How to use the hist.Histogram function in hist

from hist import Histogram
import matplotlib.pyplot as plt


servers = {
    "apache": "Apache",
    "nginx": "nginx",
    "iis": "IIS",
    "lighttpd": "lighttpd"
}
h = Histogram()

with open("result.txt", "r") as f:
    lines = f.read().split("\n")

    for line in lines:
        for server in servers:
            if server in line.lower():
                count = line.split(":")[1]
                count = int(count)

                for _ in range(count):
                    h.add(servers[server])

h = h.get_dict()
print(h)
keys = list(h.keys())

def has_tld(url, tld):
    return domain_from_url(url).endswith(tld)


def get_html(url):
    return requests.get(url).text

REGISTER = "http://register.start.bg"
HEADERS = {
    "User-Agent": "User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20100101 Firefox/21.0"
}

visited = set()
h = Histogram()
links = [link.get("href") for link in BeautifulSoup(get_html(REGISTER)).find_all("a")]


for link in links:
    if link is not None and "link.php" in link:
        try:
            target_url = REGISTER + "/" + link
            r = requests.head(target_url, headers=HEADERS, allow_redirects=True, timeout=10)
            
            target_url = domain_from_url(r.url)
            
            if target_url not in visited:
                visited.add(target_url)

                if has_tld(target_url, ".bg"):
                    print(target_url)