from os import getcwd as pwd
import tkinter as tk

def tk_15():
    """Save several images in the same folder as your program and call them
       1.gif, 2.gif, 3.gif, etc. Make sure they are all .gif files. Display one
       in a window and ask the user to enter a number. It should then use that
       number to choose the correct file name and display the correct image."""
    path_base = f"{pwd()}/tkgui/imgs"
    com_bg = "DarkOrchid2"
    window = tk.Tk()
    window.geometry("310x420")
    window.configure(background=com_bg)

    title_icon = tk.PhotoImage(file = f"{path_base}/devfzn_64x64.png")
    window.iconphoto(False, title_icon)

    photo1 = tk.PhotoImage(file = f"{path_base}/devfzn_250x250.png")
    lbl_img = tk.Label(window, image=photo1)
    lbl_img["image"] = photo1
    lbl_img["bg"] = com_bg
    lbl_img.place(x=30,y=160,width=250,height=250)

    ent_num = tk.Entry(font="Verdana 20")
    ent_num["justify"] = "center"
    ent_num.place(x=200, y=100, width=50, height=50)

    lbl_msg = tk.Message(text="Ingresa un número (1-4)", font="Verdana 16")
    lbl_msg["width"] = 150
    lbl_msg["bg"] = com_bg
    lbl_msg["justify"] = "center"
    lbl_msg.place(x=40, y=95, width=150, height=60)

    def clicked():
        sel = ent_num.get()
        sel = sel.replace(' ', '')
        if sel.isdigit() and (0 < int(sel) < 5):
            photo = tk.PhotoImage(file = f"{path_base}/img_{sel}.png")
            lbl_img.image = photo
        else:
            ent_num.delete(0, 'end')
            photo = tk.PhotoImage(file = f"{path_base}/error.png")
            lbl_img.image = photo
        lbl_img["image"] = photo
        lbl_img.update()
        ent_num.focus()

    button = tk.Button(text="Click", command=clicked)
    button["bg"] = "tomato"
    button.place(x=40, y=30, width=220, height=50)
    ent_num.focus()

    window.mainloop()