from tkinter import * from functools import partial # to prevent unwanted windows import all_constants as c import conversion_rounding as cr from datetime import date # ---------- Helper functions ---------- def build_calculation_string(calculations, max_calcs): """Return a newline-separated string of calculations, newest first.""" newest_first_list = list(reversed(calculations)) if len(newest_first_list) <= max_calcs: return "\n".join(newest_first_list) return "\n".join(newest_first_list[:max_calcs]) def recolour_widgets(widgets, bg): """Apply a background colour to multiple widgets.""" for w in widgets: w.config(bg=bg) def export_calculations_to_txt(filename, calculations, date_obj): """Write calculations to a .txt file with header and date.""" day, month, year = date_obj.strftime("%d"), date_obj.strftime("%m"), date_obj.strftime("%Y") with open(f"{filename}.txt", "w") as text_file: text_file.write("***** Weight Calculations ******\n") text_file.write(f"Generated: {day}/{month}/{year}\n\n") text_file.write("Here is your calculation history (oldest to newest)...\n") for item in calculations: text_file.write(item + "\n") # ---------- Main Converter Class ---------- class Converter: """ Weight conversion tool """ def __init__(self): self.all_calculations_list = [] self.weight_frame = Frame(padx=10, pady=10) self.weight_frame.grid() self.weight_heading = Label( self.weight_frame, text="Weight Convertor", font=("Arial", 16, "bold") ) self.weight_heading.grid(row=0) instructions = ("Please enter a weight below and then press " "one of the buttons to convert it from Grams " "to Ounces.") self.weight_instructions = Label( self.weight_frame, text=instructions, wraplength=250, width=40, justify="left" ) self.weight_instructions.grid(row=1) self.weight_entry = Entry(self.weight_frame, font=("Arial", 14)) self.weight_entry.grid(row=2, padx=10, pady=10) error = "Please enter a number" self.answer_error = Label( self.weight_frame, text=error, fg="#084C99", font=("Arial", 14, "bold") ) self.answer_error.grid(row=3) # Conversion, help and history / export buttons self.button_frame = Frame(self.weight_frame) self.button_frame.grid(row=4) button_details_list = [ ["To Grams", "#692617", lambda: self.check_weight(c.ABS_ZERO_OUNCES), 0, 0], ["To Ounces", "#193A75", lambda: self.check_weight(c.ABS_ZERO_GRAMS), 0, 1], ["Help / Info", "#3F1975", self.to_help, 1, 0], ["History / Export", "#00B3A4", self.to_history, 1, 1] ] self.button_ref_list = [] for item in button_details_list: make_button = Button( self.button_frame, text=item[0], bg=item[1], fg="#FFFFFF", font=("Arial", 12, "bold"), width=12, command=item[2] ) make_button.grid(row=item[3], column=item[4], padx=5, pady=5) self.button_ref_list.append(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_weight(self, min_weight): """Check if weight input is valid and run conversion.""" to_convert = self.weight_entry.get().strip() self.answer_error.config(fg="#004C99", font=("Arial", 13, "bold")) self.weight_entry.config(bg="#FFFFFF") error = f"Enter a number more than / equal to {min_weight}" has_errors = False try: to_convert = float(to_convert) if to_convert >= min_weight: self.convert(min_weight, to_convert) else: has_errors = True except ValueError: has_errors = True if has_errors: self.answer_error.config(text=error, fg="#9C0000", font=("Arial", 10, "bold")) self.weight_entry.config(bg="#F4CCCC") self.weight_entry.delete(0, END) def convert(self, min_weight, to_convert): if min_weight == c.ABS_ZERO_GRAMS: answer = cr.to_ounces(to_convert) answer_statement = f"{to_convert}G is {answer}Oz" else: answer = cr.to_grams(to_convert) answer_statement = f"{to_convert}Oz is {answer}G" 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): HistoryExport(self, self.all_calculations_list) # ---------- Help Window ---------- class DisplayHelp: def __init__(self, partner): background = "#CCDAFF" 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 = ("To use the program, simply enter the weight " "you wish to convert and then choose to convert " "to either Grams or Ounces.\n\n" "Please note that you cannot input a weight value below 0. " "If you try to convert a weight that is less than 0, " "you will get an error message.\n\n" "To see your calculation history and export it to a text " "file, please click the 'History / Export' button.") 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="#005CCC", fg="#FFFFFF", command=partial(self.close_help, partner) ) self.dismiss_button.grid(row=2, padx=10, pady=10) recolour_widgets([self.help_frame, self.help_heading_label, self.help_text_label], background) def close_help(self, partner): partner.to_help_button.config(state=NORMAL) self.help_box.destroy() # ---------- History / Export Window ---------- 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() if len(calculations) <= c.MAX_CALCS: calc_back = "#D5E8D4" calc_amount = "all your" else: calc_back = "#ffe6cc" calc_amount = (f"your recent calculations - " f"showing {c.MAX_CALCS} / {len(calculations)}") recent_intro_txt = (f"Below are {calc_amount} calculations " ) newest_first_string = build_calculation_string(calculations, c.MAX_CALCS) export_instruction_txt = ("Please push to save your calculations in " "a file. If the filename already exists, it will be replaced.") history_labels_list = [ ["History / Export", ("Arial", 16, "bold"), None], [recent_intro_txt, ("Arial", 11), None], [newest_first_string, ("Arial", 14), calc_back], [export_instruction_txt, ("Arial", 11), None], ] history_label_ref = [] for count, item in enumerate(history_labels_list): make_label = Label( self.history_box, text=item[0], font=item[1], bg=item[2], wraplength=300, justify="left", pady=10, padx=20 ) make_label.grid(row=count) history_label_ref.append(make_label) self.export_filename_label = history_label_ref[3] self.history_button_frame = Frame(self.history_box) self.history_button_frame.grid(row=4) button_details_list = [ ["Export", "#004C99", lambda: self.export_data(calculations), 0, 0], ["Close", "#666666", partial(self.close_history, partner), 0, 1], ] for btn in button_details_list: make_button = Button( self.history_button_frame, font=("Arial", 12, "bold"), text=btn[0], bg=btn[1], fg="#FFFFFF", width=12, command=btn[2] ) make_button.grid(row=btn[3], column=btn[4], padx=10, pady=10) def export_data(self, calculations): today = date.today() file_name = f"weights_{today.strftime('%Y_%m_%d')}" success_string = f"Export Successful! The file is called {file_name}.txt" self.export_filename_label.config( bg="#009900", text=success_string, font=("Arial", 12, "bold") ) export_calculations_to_txt(file_name, calculations, today) def close_history(self, partner): partner.to_history_button.config(state=NORMAL) self.history_box.destroy() # ---------- Main Routine ---------- if __name__ == "__main__": root = Tk() root.title("Weight Convertor") Converter() root.mainloop()