从另一个函数调用变量

Question

The function below gives me this error:

"UnboundLocalError: local variable 'housebank' referenced before assignment"

def placeBet(table, playerDictionary, bet, wager):
    playerDictionary['You'][1].add(bet)
    housebank -= (wager*table[bet][0])
    table[bet][1]['You']=wager

The housebank variable is declared in my main function below:

def main():
    housebank = 1000000
    table = {'7' : [9/1,{}]}
    playerDirectory = {'player1':[1,set(),True]}
    placeBet(table,playerDirectory, 10, 100)

How can I use housebank in the placeBet function? If I do a return it will exit the main function, which I do not want to do... Any ideas?

Answer 1

housebank is local to placeBet . There's three ways to do it that I can see:

• Make a class.

   class Foo: def __init__(): self.housebank = 1000000 def run(): # .... def placeBet(....): # .... self.housebank -= (wager*table[bet][0]) # .... def main(): Foo().run() 

• Declare housebank in a wider scope:

   housebank = 1000000 def placeBet(....): # .... def main(): # .... 

• Make placeBet a closure inside main :

   def main(): housebank = 1000000 def placeBet(....): # .... # .... rest of main ....