import csv, json, urllib.request

def get(url):
    req = urllib.request.Request(url, headers={"User-Agent": "erd-class"})
    return json.load(urllib.request.urlopen(req))

page = get("https://pokeapi.co/api/v2/pokemon?limit=20")   # page 1 of the list
with open("pokeapi_sample.csv", "w", newline="") as f:
    out = csv.writer(f)
    out.writerow(["id", "name", "height_m", "weight_kg", "type_1", "type_2", "hp"])
    for item in page["results"]:                  # each item: a name and a url
        p = get(item["url"])                      # one request per Pokemon
        types = [t["type"]["name"] for t in p["types"]] + [""]
        out.writerow([p["id"], p["name"], p["height"] / 10, p["weight"] / 10,
                      types[0], types[1], p["stats"][0]["base_stat"]])
print(page["count"], "Pokemon in the API. Next page:", page["next"])