from tkinter import * from functools import partial import all_constants as c import conversion_rounding as cr from datetime import date class Converter: """ Currency conversion tool (NZD to USD or USD to NZD) """ def __init__(self): """ Currency converter GUI """ self.all_calculations_list = [] self.currency_frame = Frame(padx=10, pady=10) self.currency_frame.grid() self.currency_heading = Label(self.currency_frame, text="Currency Converter", font=("Arial", "16", "bold") ) self.currency_heading.grid(row=0) instructions = "Please enter a price below and then press " \ "one of the buttons to convert it from NZD " \ "to USD or USD to NZD" self.currency_instructions = Label(self.currency_frame, text=instructions, wraplength=250, width=40, justify="left") self.currency_instructions.grid(row=1) self.currency_entry = Entry(self.currency_frame, font=("Arial", "14") ) self.currency_entry.grid(row=2, padx=10, pady=10) error = "Please enter a number" self.answer_error = Label(self.currency_frame, text=error, fg="#9C0000", font=("Arial", "14", "bold")) self.answer_error.grid(row=3) # Conversion, help and history / export buttons self.button_frame = Frame(self.currency_frame) self.button_frame.grid(row=4) # button list button_details_list = [ ["To NZD", "#990099", lambda: self.check_currency("usd_to_nzd"), 0, 0], ["To USD", "#009900", lambda: self.check_currency("nzd_to_usd"), 0, 1], ["Help / Info", "#CC6600", self.to_help, 1, 0], ["History / Export", "#004C99", self.to_history, 1, 1] ] self.button_ref_list = [] for item in button_details_list: self.make_button = Button(self.button_frame, text=item[0], bg=item[1], fg="#FFFFFF", font=("Arial", "12", "bold"), width=12, command=item[2]) self.make_button.grid(row=item[3], column=item[4], padx=5, pady=5) self.button_ref_list.append(self.make_button) self.to_help_button = self.button_ref_list[2] self.to_history_button = self.button_ref_list[3] self.to_history_button.config(state=DISABLED) def check_currency(self, conversion_type): """ Checks input is valid and performs conversion """ to_convert = self.currency_entry.get() self.answer_error.config(fg="#004C99", font=("Arial", "13", "bold")) self.currency_entry.config(bg="#FFFFFF") error = "Enter a valid number" has_errors = "no" try: to_convert = float(to_convert) self.convert(conversion_type, to_convert) except ValueError: has_errors = "yes" if has_errors == "yes": self.answer_error.config(text=error, fg="#9C0000") self.currency_entry.config(bg="#F4CCCC") self.currency_entry.delete(0, END) def convert(self, conversion_type, to_convert): """ Converts currency and updates answer label """ if conversion_type == "nzd_to_usd": answer = cr.nzd_to_usd(to_convert) answer_statement = f"${to_convert} NZD is ${answer} USD" else: answer = cr.usd_to_nzd(to_convert) answer_statement = f"${to_convert} USD is ${answer} NZD" self.to_history_button.config(state=NORMAL) self.answer_error.config(text=answer_statement) self.all_calculations_list.append(answer_statement) print(self.all_calculations_list) def to_help(self): DisplayHelp(self) def to_history(self): """ Opens history dialogue box and disables history button (so that users can't create multiple history boxes). """ HistoryExport(self, self.all_calculations_list) class DisplayHelp: def __init__(self, partner): background = "#ffe6cc" self.help_box = Toplevel() partner.to_help_button.config(state=DISABLED) self.help_box.protocol('WM_DELETE_WINDOW', partial(self.close_help, partner)) self.help_frame = Frame(self.help_box, width=300, height=200) self.help_frame.grid() self.help_heading_label = Label(self.help_frame, text="Help / Info", font=("Arial", "14", "bold")) self.help_heading_label.grid(row=0) help_text = "Enter an amount and choose a conversion button.\n\n" \ "Use 'To USD' to convert NZD to USD.\n" \ "Use 'To NZD' to convert USD to NZD.\n\n" \ "Click History / Export to save your calculations." self.help_text_label = Label(self.help_frame, text=help_text, wraplength=350, justify="left") self.help_text_label.grid(row=1, padx=10) self.dismiss_button = Button(self.help_frame, font=("Arial", "12", "bold"), text="Dismiss", bg="#CC6600", fg="#FFFFFF", command=partial(self.close_help, partner)) self.dismiss_button.grid(row=2, padx=10, pady=10) recolour_list = [self.help_frame, self.help_heading_label, self.help_text_label] for item in recolour_list: item.config(bg=background) def close_help(self, partner): partner.to_help_button.config(state=NORMAL) self.help_box.destroy() def export_history(calculations): today = date.today() file_name = f"currency_{today}.txt" with open(file_name, 'w') as text_file: for item in calculations: text_file.write(item + "\n") class HistoryExport: def __init__(self, partner, calculations): self.history_box = Toplevel() partner.to_history_button.config(state=DISABLED) self.history_box.protocol('WM_DELETE_WINDOW', partial(self.close_history, partner)) self.history_frame = Frame(self.history_box) self.history_frame.grid() newest_first_string = "" newest_first_list = list(reversed(calculations)) if len(newest_first_list) <= c.MAX_CALCS: for item in newest_first_list[:-1]: newest_first_string += item + "\n" newest_first_string += newest_first_list[-1] else: for item in newest_first_list[:c.MAX_CALCS - 1]: newest_first_string += item + "\n" newest_first_string += newest_first_list[c.MAX_CALCS - 1] history_label = Label(self.history_box, text=newest_first_string, font=("Arial", "14"), justify="left") history_label.grid(row=0) Button(self.history_box, text="Export", command=lambda: export_history(calculations) ).grid(row=1) Button(self.history_box, text="Close", command=partial(self.close_history, partner) ).grid(row=2) def close_history(self, partner): partner.to_history_button.config(state=NORMAL) self.history_box.destroy() if __name__ == "__main__": root = Tk() root.title("Currency Converter") Converter() root.mainloop()