banque = {"Tristan":50000,"Victor":10000,"Noah":250000,"Dereck":20000,"Leo":100000,"Zia":225000,"Arthur":5000,"Apolline":250000,"Vincenzo":500000,"Gurvan":100000}
def affiche_client (banque):
	for client in banque:
		if client in banque:
			print(client,banque[client])

def ajout(client,depot,banque):
	if client in banque:
		banque[client]=banque[client]+depot
	else:
		banque[client]=depot

def supprime(client,banque):
	if client in banque:
		del banque[client]

print(affiche_client(banque))
print(ajout("Tristan",9999,banque))
print(banque["Tristan"])
print(banque)
print(supprime("Tristan",banque))
print(banque)