from tkinter import * from tkinter import ttk from functools import partial from datetime import date # Conversion constants CM_TO_INCH = 0.393701 M_TO_FEET = 3.28084 KM_TO_MILES = 0.621371 MAX_CALCS = 5 # Number of calculations to keep in history def convert_cm_to_inch(value): return round(value * CM_TO_INCH, 2) def convert_m_to_ft(value): return round(value * M_TO_FEET, 2) def convert_km_to_miles(value): return round(value * KM_TO_MILES, 2) class Converter: def __init__(self): self.all_calculations_list = [] self.main_frame = Frame(padx=10, pady=10) self.main_frame.grid() self.heading = Label(self.main_frame, text="Length Converter", font=("Arial", "16", "bold")) self.heading.grid(row=0) instructions = ("Enter a number, choose a conversion type from the dropdown, " "and click 'Convert'.\n" "• Centimeters to Inches\n" "• Meters to Feet\n" "• Kilometers to Miles") self.instructions_label = Label(self.main_frame, text=instructions, wraplength=300, justify="left") self.instructions_label.grid(row=1) self.input_entry = Entry(self.main_frame, font=("Arial", "14")) self.input_entry.grid(row=2, pady=10) self.conversion_var = StringVar() self.conversion_dropdown = ttk.Combobox( self.main_frame, textvariable=self.conversion_var, values=["Centimeters to Inches", "Meters to Feet", "Kilometers to Miles"], state="readonly", font=("Arial", 12) ) self.conversion_dropdown.grid(row=3) self.conversion_dropdown.current(0) # Default selection self.convert_button = Button(self.main_frame, text="Convert", bg="#084C99", fg="white", font=("Arial", "12", "bold"), command=self.check_input) self.convert_button.grid(row=4, pady=10) self.answer_label = Label(self.main_frame, text="", fg="#084C99", font=("Arial", "14", "bold")) self.answer_label.grid(row=5) self.button_frame = Frame(self.main_frame) self.button_frame.grid(row=6) # Help and History buttons self.to_help_button = Button(self.button_frame, text="Help / Info", bg="#cc6600", fg="white", font=("Arial", "12", "bold"), width=14, command=self.to_help) self.to_help_button.grid(row=0, column=0, padx=5, pady=5) self.to_history_button = Button(self.button_frame, text="History / Export", bg="#004C99", fg="white", font=("Arial", "12", "bold"), width=14, command=self.to_history, state=DISABLED) self.to_history_button.grid(row=0, column=1, padx=5, pady=5) def check_input(self): user_input = self.input_entry.get() conversion_type = self.conversion_var.get() self.answer_label.config(fg="#084C99") self.input_entry.config(bg="white") if len(user_input.replace('.', '', 1)) > 7: self.answer_label.config(text="Input too long (max 7 digits)", fg="#9C0000") self.input_entry.config(bg="#F4CCCC") return try: value = float(user_input) # Ban zero and enforce minimum value of 0.1 if value < 0.1: self.answer_label.config(text="Please enter a number ≥ 0.1", fg="#9C0000") self.input_entry.config(bg="#F4CCCC") return self.convert(conversion_type, value) except ValueError: self.answer_label.config(text="Please enter a valid number", fg="#9C0000") self.input_entry.config(bg="#F4CCCC") def convert(self, conversion_type, value): if conversion_type == "Centimeters to Inches": result = convert_cm_to_inch(value) text = f"{value} cm = {result} inches" elif conversion_type == "Meters to Feet": result = convert_m_to_ft(value) text = f"{value} m = {result} feet" elif conversion_type == "Kilometers to Miles": result = convert_km_to_miles(value) text = f"{value} km = {result} miles" else: text = "Invalid conversion type." self.answer_label.config(text=text) self.all_calculations_list.append(text) self.to_history_button.config(state=NORMAL) def to_help(self): DisplayHelp(self) def to_history(self): 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, bg=background) self.help_frame.grid() Label(self.help_frame, text="Help / Info", font=("Arial", "14", "bold"), bg=background).grid(row=0) help_text = ("Enter a number, choose the type of length conversion from the dropdown, " "then click 'Convert'. You can view recent conversions or export them as a text file.") Label(self.help_frame, text=help_text, wraplength=350, justify="left", bg=background).grid(row=1, padx=10) Button(self.help_frame, text="Dismiss", bg="#cc6600", fg="white", font=("Arial", "12", "bold"), command=partial(self.close_help, partner)).grid(row=2, pady=10) def close_help(self, partner): partner.to_help_button.config(state=NORMAL) self.help_box.destroy() 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() calc_back = "#D5E8D4" if len(calculations) <= MAX_CALCS else "#ffe6cc" calc_amount = "all your" if len(calculations) <= MAX_CALCS else f"your recent {MAX_CALCS} of {len(calculations)}" recent_intro_txt = f"Below are {calc_amount} conversions." newest_first = list(reversed(calculations))[:MAX_CALCS] calc_text = "\n".join(newest_first) export_text = "Click to save your conversions to a file." label_details = [ ["History / Export", ("Arial", "16", "bold"), None], [recent_intro_txt, ("Arial", "11"), None], [calc_text, ("Arial", "14"), calc_back], [export_text, ("Arial", "11"), None], ] self.export_filename_label = None for idx, item in enumerate(label_details): lbl = Label(self.history_frame, text=item[0], font=item[1], wraplength=300, justify="left", bg=item[2]) lbl.grid(row=idx, sticky="w", padx=20, pady=5) if idx == 3: self.export_filename_label = lbl self.button_frame = Frame(self.history_box) self.button_frame.grid(row=4) Button(self.button_frame, text="Export", bg="#004C99", fg="white", font=("Arial", "12", "bold"), width=12, command=lambda: self.export_data(calculations)).grid(row=0, column=0, padx=10, pady=10) Button(self.button_frame, text="Close", bg="#666666", fg="white", font=("Arial", "12", "bold"), width=12, command=partial(self.close_history, partner)).grid(row=0, column=1, padx=10, pady=10) def export_data(self, calculations): today = date.today() file_name = f"length_conversions_{today.strftime('%Y_%m_%d')}.txt" with open(file_name, "w") as file: file.write("**** Length Conversions ****\n") file.write(f"Date: {today.strftime('%d/%m/%Y')}\n\n") file.write("Oldest to newest:\n") for item in calculations: file.write(item + "\n") self.export_filename_label.config(text=f"Exported to {file_name}!", bg="#009900", fg="white", font=("Arial", "12", "bold")) 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("Length Converter") Converter() root.mainloop()