2 か国のインフレ率と比べて、昇給が物価に追いついているか確かめる

curl -s -H "Authorization: Bearer $NARWHAL_API_KEY" \
  "https://api.narwhalapi.com/v1/economics/DEU/inflation"

{
  "country": "DEU",
  "period": "2026-09",
  "year_over_year": "3.3",
  "month_over_month": "0.6",
  "year_to_date": "3.2",
  "released_on": "2026-10-13"
}

curl -s -H "Authorization: Bearer $NARWHAL_API_KEY" \
  "https://api.narwhalapi.com/v1/economics/JPN/inflation"

{
  "country": "JPN",
  "period": "2026-09",
  "year_over_year": "2.1",
  "month_over_month": "0.0",
  "year_to_date": "1.3",
  "released_on": "2026-10-23"
}

curl -s -H "Authorization: Bearer $NARWHAL_API_KEY" \
  "https://api.narwhalapi.com/v1/economics/DEU/cpi/observations?start=2025-09&end=2026-09"

{
  "country": "DEU",
  "as_of": "2026-10-13T00:00:00Z",
  "index_base": "2020=100",
  "observations": [
    {
      "period": "2025-09",
      "value": "122.6"
    },
    {
      "period": "2026-09",
      "value": "126.6"
    }
  ],
  "next_cursor": null
}

import json
import os
import urllib.request
from decimal import Decimal

def get(path):
    req = urllib.request.Request(
        "https://api.narwhalapi.com" + path,
        headers={"Authorization": "Bearer " + os.environ["NARWHAL_API_KEY"]},
    )
    with urllib.request.urlopen(req, timeout=30) as r:
        return json.load(r)

def check_raise(country, raise_percent):
    latest = get(f"/v1/economics/{country}/inflation")
    period = latest["period"]
    year, month = period.split("-")
    prior = f"{int(year) - 1}-{month}"
    index = get(f"/v1/economics/{country}/cpi/observations?start={prior}&end={period}")
    values = {o["period"]: Decimal(o["value"]) for o in index["observations"]}
    from_index = (values[period] / values[prior] - 1) * 100
    inflation = Decimal(latest["year_over_year"])
    raise_ = Decimal(raise_percent)
    real = ((1 + raise_ / 100) / (1 + inflation / 100) - 1) * 100
    print(f"{country} {period}: inflation {inflation}% (from index {from_index:.2f}%), "
          f"raise {raise_}%, real change {real:+.2f}%")

check_raise("DEU", "3.0")
check_raise("JPN", "2.5")