scrapping the dotabuff hero meta page

"""read dotabuff hero meta data"""

from bs4 import BeautifulSoup
import urllib.request

dotabuff = "https://www.dotabuff.com/heroes/meta"
local = "dotabuff.html"
with open(local, encoding="utf-8") as f:
    stream = f.read()
    soup = BeautifulSoup(stream, "lxml")
    data = soup.table
    chars = data.find_all("tr")

    header1 = "blank, <2k, <2k , 2k-3k, 2k-3k, 3k-4k, 3k-4k, 4k-5k, 4k-5k, 5k+, 5k+"
    header2 = "hero, Pick%, Win%, Pick%, Win%, Pick%, Win% , Pick%, Win%, Pick%, Win%"
    content = ""
    for i in range (1, len(chars)):
        output = ""
        row = chars[i].find_all("td")
        for j in range(1,len(row)):
            output+=","+row[j].get_text()

        content += output[1:]+"\n"
        #print(output)

        with open("dotaheroes.csv", "w", encoding="utf-8") as file:
            file.write(header1+"\n")
            file.write(header2)
            file.write(content)