Pythonista UI script that converts a dollar amount for a given year to current dollars

historical-dollars.py

from __future__ import division

from datetime import date
from xml.etree import ElementTree
import requests
import ui


def calculate_amount(sender):
    """Convert given dollar amount for given year to current dollars"""
    amount = view['amount'].text
    year = view['year'].text

    if not (amount and year):
        return

    api_key = 'YOUR API KEY HERE'
    api_url = 'http://api.wolframalpha.com/v2/query'
    query_template = '${amount} ({past_year} US dollars) in {current_year}'
    query = query_template.format(amount=amount,
                                  past_year=year,
                                  current_year=date.today().year)
    parameters = {'appid': api_key,
                  'input': query,
                  'format': 'plaintext',
                  'podtitle': 'Result'}
    response = requests.get(api_url, params=parameters)
    xml_soup = ElementTree.fromstring(response.content)
    new_amount = xml_soup.find('pod/subpod/plaintext').text.splitlines()[0]
    view['result'].text = new_amount


def setup_view():
    view = ui.View()
    view.name = 'Historical Dollars'
    view.background_color = 'white'
    view.width, view.height = ui.get_screen_size()

    amount_field = ui.TextField()
    amount_field.name = 'amount'
    amount_field.keyboard_type = ui.KEYBOARD_DECIMAL_PAD
    amount_field.placeholder = 'Dollar amount'
    amount_field.width *= 2
    amount_field.height /= 2

    year_field = ui.TextField()
    year_field.name = 'year'
    year_field.keyboard_type = ui.KEYBOARD_NUMBER_PAD
    year_field.placeholder = 'Year'
    year_field.width *= 2
    year_field.height /= 2

    button = ui.Button(title='Calculate')
    button.action = calculate_amount

    result_label = ui.Label()
    result_label.name = 'result'
    result_label.width = view.width
    result_label.alignment = ui.ALIGN_CENTER

    horizontal_centre = view.width * 0.5
    field_spacing = amount_field.height * 1.5
    amount_field.center = (horizontal_centre, amount_field.height)
    year_field.center = (horizontal_centre,
                         amount_field.center[1] + field_spacing)
    button.center = (horizontal_centre,
                     year_field.center[1] + field_spacing * 0.75)
    result_label.center = (horizontal_centre,
                           button.centre[1] + field_spacing * 0.75)

    view.add_subview(amount_field)
    view.add_subview(year_field)
    view.add_subview(button)
    view.add_subview(result_label)

    return view

view = setup_view()
view.present('sheet')