Simple currency converter scraping google

# requirements.txt
"""
requests_html
"""

# currency_converter.py
from requests_html import HTMLSession

def convert(amount=1, _from='ars', to='usd'):
    url = f'https://www.google.com/search?q={amount}+{_from}+to+{to}'
    session = HTMLSession()
    response = session.get(url)
    html = response.html
    result_selector = "#knowledge-currency__updatable-data-column > div.b1hJbf > div.dDoNo.vk_bk.gsrt > span.DFlfde.SwHCTb"
    result = html.find(result_selector)[0]
    return result.text


# currency_converterUI.py
from tkinter import Frame, Tk, StringVar, DoubleVar
from tkinter import ttk
from currency_converter import convert


class ConverterUI(Frame):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.currencies = ('ars', 'usd', 'mxn', 'eur',) # Default list of currency 'symbols'
        self.master.title('Currency Converter? Lol - by David Emanuel Sandoval')

        self.make_widgets()

    def make_widgets(self):
        # setting up all the widgets
        self._from_lbl = ttk.Label(self, text='De:')
        self.to_lbl = ttk.Label(self, text='a:')
        # Variables for the comboboxes
        self._from = StringVar()
        self.to = StringVar()
        self._from_combo = ttk.Combobox(self, values=self.currencies, textvariable=self._from)
        self.to_combo = ttk.Combobox(self, values=self.currencies, textvariable=self.to)
        # second row widgets
        self.amount_lbl = ttk.Label(self, text='Cantidad:')
        self.result = StringVar()
        self.result.set('Recalculando... :-)')
        self.amount = DoubleVar()
        self.amount.set(1)
        self.amount_spin = ttk.Spinbox(self, from_=0, to=9999999, textvariable=self.amount)
        self.convert_btn = ttk.Button(self, text='Calcular', command=self.convert)
        self.result_lbl = ttk.Label(self, textvariable=self.result)
        # placing
        self._from_lbl.grid(row=0, column=0)
        self.to_lbl.grid(row=0, column=2)
        self._from_combo.grid(row=0, column=1)
        self.to_combo.grid(row=0, column=3)
        self.amount_lbl.grid(row=1, column=0)
        self.amount_spin.grid(row=1, column=1)
        self.convert_btn.grid(row=1, column=2)
        self.result_lbl.grid(row=1, column=3)

    def convert(self):
        amount = self.amount.get()
        _from = self._from.get()
        to = self.to.get()
        result = convert(amount, _from, to)
        result = f'Resultado: {result}'
        self.result.set(result)


def main():
    root = Tk()
    w = ConverterUI()
    w.pack()
    root.mainloop()

if __name__ == '__main__':
    main()