Python Weather App – API Project

import os, requests
from datetime import datetime

API_KEY = os.getenv("OPENWEATHER_API_KEY", "your_key_here")
BASE = "https://api.openweathermap.org/data/2.5"

def get_current(city, units="metric"):
    r = requests.get(f"{BASE}/weather", params={"q": city, "appid": API_KEY, "units": units}, timeout=10)
    r.raise_for_status()
    return r.json()

def get_forecast(city, units="metric"):
    r = requests.get(f"{BASE}/forecast", params={"q": city, "appid": API_KEY, "units": units, "cnt": 40}, timeout=10)
    r.raise_for_status()
    return r.json()["list"]

def display_current(d, units):
    sym = "°C" if units == "metric" else "°F"
    print(f"\n{'='*40}")
    print(f"  {d['name']}, {d['sys']['country']}")
    print(f"  {d['weather'][0]['description'].title()}")
    print(f"  Temp: {d['main']['temp']}{sym}  (feels like {d['main']['feels_like']}{sym})")
    print(f"  Humidity: {d['main']['humidity']}%  Wind: {d['wind']['speed']} m/s")
    print("="*40)

def display_forecast(forecast, units):
    sym = "°C" if units == "metric" else "°F"
    print("\n5-Day Forecast:")
    seen = set()
    for entry in forecast:
        dt = datetime.fromtimestamp(entry["dt"])
        if dt.hour == 12 and dt.date() not in seen:
            seen.add(dt.date())
            print(f"  {dt.strftime('%a %b %d')}: {entry['main']['temp']}{sym}  {entry['weather'][0]['description']}")

city = input("City: ").strip()
units = input("Units metric/imperial [metric]: ").strip() or "metric"
try:
    display_current(get_current(city, units), units)
    display_forecast(get_forecast(city, units), units)
except requests.HTTPError as e:
    print(f"Error {e.response.status_code}: city not found or invalid API key")

export OPENWEATHER_API_KEY=your_key_here
python weather.py