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main.py

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+from tkinter.ttk import *
+from tkinter import *
+import time
+import random
+from tkinter import messagebox
+from PIL import Image, ImageTk
+
+images = []
+i = -1
+
+
+def start(finestra):
+    j = 20
+    for i in range(0, 5):
+        load = Image.open("./img/light_off.jpg")
+        load = load.resize((80, 150), Image.ANTIALIAS)
+        render = ImageTk.PhotoImage(load)
+        img = Label(finestra, image=render)
+        img.image = render
+        images.append(img)
+
+    for img in images:
+        img.place(x=j, y=20)
+        j += 80
+    return j
+
+
+def restart():
+    btn['text'] = "Start"
+    btn['command'] = lambda: countdown(finestra)
+    for i in images:
+        load = Image.open("./img/light_off.jpg")
+        load = load.resize((80, 150), Image.ANTIALIAS)
+        load = ImageTk.PhotoImage(load)
+        i.configure(image=load)
+        i.image = load
+
+
+def off():
+    for i in images:
+        load = Image.open("./img/light_off.jpg")
+        load = load.resize((80, 150), Image.ANTIALIAS)
+        load = ImageTk.PhotoImage(load)
+        i.configure(image=load)
+        i.image = load
+
+
+def b(finestra, now, wait):
+    restart()
+    btn['text'] = "Start"
+    btn['command'] = lambda: countdown(finestra)
+
+    tempo = round(((time.time() - now) * 1000) - wait, 3)
+    if tempo > 0:
+        messagebox.showinfo("GG", "Tempo di reazione: {} millisecondi".format(tempo))
+    elif tempo <= 0:
+        messagebox.showinfo("Fail", "Jump start!")
+        restart()
+
+
+def change(i, finestra):
+    load = Image.open("./img/light_on.jpg")
+    load = load.resize((80, 150), Image.ANTIALIAS)
+    load = ImageTk.PhotoImage(load)
+    i.configure(image=load)
+    i.image = load
+    countdown(finestra)
+
+
+def countdown(finestra):
+    global i
+    btn['text'] = "Press me!"
+    btn['command'] = lambda: b(finestra, now, wait)
+
+    if i < 4:
+        finestra.after(1000, lambda: change(images[i], finestra))
+        i += 1
+    else:
+        i = -1
+        wait = random.randint(250, 2000)
+        finestra.after(wait, lambda: off())
+
+        now = time.time()
+
+
+finestra = Tk()
+finestra.title("Lights out")
+j = start(finestra)
+finestra.geometry("{}x250".format(str(j + 20)))
+
+# finestra['background'] = "white"
+
+btn = Button(finestra, text="start", command=lambda: countdown(finestra))
+btn.place(x=j / 2, y=200)
+
+finestra.mainloop()