UnboundLocalError: local variable 'figure_perso' referenced before assignment

[mederic39]

Hello,
I'm a French user (so my English is bad), and I make a "John Conway Life's Game".
I want to make a function that place where you want custom elements by clicking on the canvas (glider, blinker, and others...), but I'm going to be crazy!

Please, help me, here is the code :

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from tkinter import * from time import * largeur = 60 hauteur = 60 cellules = [[0 for j in range(largeur)] for i in range (hauteur)] voisins = [[0 for j in range(largeur)] for i in range (hauteur)]   def compte_voisins(i,j):     if i == 0:         if j == 0:             return cellules[0][1] + cellules[1][1] + cellules[1][0]         if j == largeur - 1:             return cellules[0][largeur - 2] + cellules[1][largeur - 2] + \             cellules[1][largeur - 1]         return cellules[0][j - 1] + cellules[0][j + 1] + \         cellules[1][j-1] + cellules[1][j] + cellules[1][j+1]     if i == hauteur - 1:         if j == 0:             return cellules[hauteur - 1][1] + cellules[hauteur - 2][1] + cellules[hauteur - 2][0]         if j == largeur - 1:             return cellules[hauteur - 1][largeur - 2] + cellules[hauteur - 2][largeur - 2] + \             cellules[hauteur - 2][largeur - 1]         return cellules[hauteur - 1][j - 1] + cellules[hauteur - 1][j + 1] + \         cellules[hauteur - 2][j-1] + cellules[hauteur - 2][j] + cellules[hauteur - 2][j+1]     else:         if j == 0:             return cellules[i - 1][0] + cellules[i + 1][0] + \         cellules[i - 1][1] + cellules[i][1] + cellules[i + 1][1]         if j == largeur - 1:             return cellules[i - 1][largeur - 1] + cellules[i + 1][largeur - 1] + \         cellules[i - 1][largeur - 2] + cellules[i][largeur - 2] + cellules[i + 1][largeur - 2]         else:             return cellules[i - 1][j -1] + cellules[i - 1][j] + cellules[i - 1][j + 1] + \                    cellules[i ][j - 1]          +               cellules[i ][j+1] + \                    cellules[i + 1][j - 1] + cellules[i + 1][j] + cellules[i + 1][j + 1]   def grille_voisins():     for i in range (hauteur):         for j in range (largeur):             voisins[i][j] = compte_voisins(i,j)   def grille_lendemain():     for i in range (hauteur):         for j in range (largeur):             if cellules[i][j] == 0 and voisins[i][j] == 3:                 cellules[i][j] = 1             if cellules[i][j] == 1 and voisins[i][j] != 2 and voisins[i][j] !=3:                 cellules[i][j] = 0   def affichage_grille(tab):     for i in range(len(tab)):         print(tab[i])   def jeu():     dessine_etat()     for i in range (regle_jours.get()):         print(" ")         grille_voisins()         grille_lendemain()         sleep(0.1)         dessine_etat()   def dessine_cellule(i,j):     can.create_rectangle(j * e, i * e,(j + 1) * e - 1,(i + 1) * e - 1, fill="red", width=0)   def dessine_etat():     can.delete("all")     for i in range (hauteur):         for j in range (largeur):             if cellules[i][j] == 1:                 dessine_cellule(i,j)     fen.update()   def trace_quadrillage():     for i in range(hauteur):         can.create_line(0, i * e - 1, largeur * e + 1, i * e - 1, fill='black')     for j in range(largeur):         can.create_line(j * e - 1, 0, j * e - 1, hauteur * e + 1, fill='black')   def action_clic_souris(event):     b = regle_taille.get()     f = regle_taillebis.get()     can.focus_set()     x = event.x // e     y = event.y // e     for c in range(b):         for d in range(f):             cellules[y+c][x+d] = 1             can.create_rectangle((x+d) * e, (y+c) * e,(x+d + 1) * e - 1,(y+c + 1) * e - 1, fill="red", width=0)   def action_declic_souris(event):     b = regle_taille.get()     f = regle_taillebis.get()     can.focus_set()     x = event.x // e     y = event.y // e     for c in range(b):         for d in range(f):             cellules[y+c][x+d] = 0             can.create_rectangle((x+d) * e, (y+c) * e,(x+d + 1) * e - 1,(y+c + 1) * e - 1, fill="white", width=0)   def create_perso():     figure_perso = perso_planeur()     for i in range(int(len(figure_perso)/2)):         cellules[figure_perso[i*2+1]][figure_perso[i*2]] = 1         can.create_rectangle(figure_perso[i*2] * e, figure_perso[i*2+1] * e,(figure_perso[i*2] + 1) * e - 1,(figure_perso[i*2+1] + 1) * e - 1, fill="red", width=0)   def perso_planeur(type):     print(type)     if type == 1:         figure_perso = [0,1, 1,2, 2,0, 2,1, 2,2]     elif type == 2:         figure_perso = [5,0, 6,1, 6,2, 6,3, 5,3, 4,3, 3,3, 2,2]     elif type == 3:         figure_perso = [5,0, 6,1, 6,2, 6,3, 5,3, 4,3, 3,3, 2,3, 1,2]     elif type == 4:         figure_perso = [5,0, 6,1, 6,2, 6,3, 5,3, 4,3, 3,3, 2,3, 1,3, 0,2]     return figure_perso   def perso_vaisseau_leger():     figure_perso = [5,0, 6,1, 6,2, 6,3, 5,3, 4,3, 3,3, 2,2]     return figure_perso   def perso_vaisseau_moyen():     figure_perso = [5,0, 6,1, 6,2, 6,3, 5,3, 4,3, 3,3, 2,3, 1,2]     return figure_perso   def perso_vaisseau_lourd():     figure_perso = [5,0, 6,1, 6,2, 6,3, 5,3, 4,3, 3,3, 2,3, 1,3, 0,2]     return figure_perso   def action_planeur(event):     can.focus_set()     x = event.x // e     y = event.y // e     figure_perso = perso_planeur(type)     print(figure_perso)     for i in range(int(len(figure_perso)/2)):         cellules[figure_perso[i*2+1]+y][figure_perso[i*2]+x] = 1         can.create_rectangle((figure_perso[i*2]+x) * e, (figure_perso[i*2+1]+y) * e,(figure_perso[i*2]+x + 1) * e - 1,(figure_perso[i*2+1]+y + 1) * e - 1, fill="red", width=0)     return figure_perso   e = 10 figure_perso=[] fen = Tk()   can = Canvas(fen, width=600, height=800, bg="white") can.grid(row=0, column=0, rowspan=6)   can.bind("<Button-1>", action_clic_souris) can.bind("<Button-2>", action_planeur) can.bind("<Button-3>", action_declic_souris)   bouton_lancer = Button(fen, text="Lancer",command=jeu) bouton_lancer.grid(row=4, column=2)   regle_jours = Scale(fen,orient='vertical', from_=5000, to=0, resolution=1,     tickinterval=500, length=300) regle_jours.grid(row=3, column=2) regle_jours.set(5000)   regle_taille = Scale(fen,orient='vertical', from_=hauteur, to=0, resolution=1,     tickinterval=int(hauteur/10), length=300) regle_taille.grid(row=3, column=3) regle_taille.set(1)   regle_taillebis = Scale(fen,orient='vertical', from_=largeur, to=0, resolution=1,     tickinterval=int(largeur/10), length=300) regle_taillebis.grid(row=3, column=4) regle_taillebis.set(1)   bouton_planeur = Button(fen, text="Planeur",command=lambda: perso_planeur(1)) bouton_planeur.grid(row=0, column=3) bouton_planeur.place(rely=0.1, relx= 0.82)   bouton_vaisseau_leger = Button(fen, text="Vaisseau Léger",command=lambda: perso_planeur(2)) bouton_vaisseau_leger.grid(row=0, column=3) bouton_vaisseau_leger.place(rely=0.14, relx= 0.82)   bouton_vaisseau_moyen = Button(fen, text="Vaisseau Moyen",command=lambda: perso_planeur(3)) bouton_vaisseau_moyen.grid(row=0, column=3) bouton_vaisseau_moyen.place(rely=0.18, relx= 0.82)   bouton_vaisseau_lourd = Button(fen, text="Vaisseau Lourd",command=lambda: perso_planeur(4)) bouton_vaisseau_lourd.grid(row=0, column=3) bouton_vaisseau_lourd.place(rely=0.22, relx= 0.82)   dessine_etat() trace_quadrillage() fen.mainloop()

The problems come from lines 102 to line 186, ignore the rest. I have this error :

Error:
*** Console de processus distant Réinitialisée *** 
<class 'type'>
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\EduPython\App\lib\tkinter\__init__.py", line 1538, in __call__
    return self.func(*args)
  File "C:\Users\meder\Downloads\jeu-de-la-vie-2020-06-10-test4.py", line 150, in action_planeur
    figure_perso2 = perso_planeur(type)
  File "C:\Users\meder\Downloads\jeu-de-la-vie-2020-06-10-test4.py", line 132, in perso_planeur
    return figure_perso
UnboundLocalError: local variable 'figure_perso' referenced before assignment
>>> 

What is does mean?

If you want to help me, I think I have a problem with the variables appelation into the functions, the "return", and the buttons...

Thank you.

[menator01]

It means you are trying to print or use a variable before assigning it.
This is not the best example but, follows along the lines of your error
Example

1 2	print(myvar) myvar = 'hello'

This would give an error because myvar has not been assigned.

[Yoriz]

in the method def action_planeur(event):
there is

1	figure_perso = perso_planeur(type)

type is a bulitin you should have some other variable name here.

when perso_planeur(type) is called with type

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def perso_planeur(type):     print(type)     if type == 1:         figure_perso = [0,1, 1,2, 2,0, 2,1, 2,2]     elif type == 2:         figure_perso = [5,0, 6,1, 6,2, 6,3, 5,3, 4,3, 3,3, 2,2]     elif type == 3:         figure_perso = [5,0, 6,1, 6,2, 6,3, 5,3, 4,3, 3,3, 2,3, 1,2]     elif type == 4:         figure_perso = [5,0, 6,1, 6,2, 6,3, 5,3, 4,3, 3,3, 2,3, 1,3, 0,2]         print()     return figure_perso

type will never be true in any of the if conditions so when it tries to return figure_perso it has not been defined as it would only be defined is one of the condition where true.