Python SLC Weather Mailer

slc-weather-mailer.py

"""
Collects email address and names from a text field 'emails.txt' located in the
same directory. Send a weather daily weather forecast of Salt Lake City pulled
in the from the Open Weather Map Api via a gmail account.
"""

import getpass
import smtplib
import requests


def get_emails():
    """Returns a dictionary of email address and names from 'emails.txt' """

    emails = {}

    try:
        email_file = open('emails.txt', 'r')

        for line in email_file:
            (email, name) = line.split(',')
            emails[email] = name.strip()

    except FileNotFoundError as err:
        print(err)

    return emails


def get_weather_forcast():
    """Request data from the API and constructs email body"""

    api_key = input("Enter your Open Weather Map API Key")

    url = "https://api.openweathermap.org/data/2.5"
    url += "/weather?id=5780993&units=imperial&appid="
    url += api_key

    weather_request = requests.get(url)
    weather_json = weather_request.json()

    city = weather_json['name']
    description = weather_json['weather'][0]['description']
    temp_min = weather_json['main']['temp_min']
    temp_max = weather_json['main']['temp_max']

    forecast = 'The ' + city + ' forecast for today is '
    forecast += description + ' with a high of ' + str(int(temp_max))
    forecast += ' and a low of ' + str(int(temp_min)) + '.'

    return forecast


def send_emails(emails, forecast):
    """
    request gmail address to send from and password for that account from user.
    Constructors the header of the email and sends the entire message.
    """

    server = smtplib.SMTP('smtp.gmail.com', '587')
    server.starttls()

    from_email = input('gmail account to send from: ')
    password = getpass.getpass('Password: ')

    server.login(from_email, password)

    # Sending email to address in 'emails.txt'
    for to_email, name in emails.items():
        message = "Today's Salt Lake City Forcast\n\n"
        message += "Hello, " + name + "\n\n"
        message += forecast
        server.sendmail(from_email, to_email, message)

    server.quit()


def main():
    """
    arguments for send_emails are assigned based on return values of
    emails and forecast
    """
    emails = get_emails()
    forecast = get_weather_forcast()
    send_emails(emails, forecast)


main()