def main():
cash = float(input("How much money: "))
coins = 0
def changeCounter(n):
while True:
if cash - n > 0:
cash -= n
coins += 1
else:
break
return
main()
changeCounter(0.25)
当我运行此代码时，出现错误
UnboundLocalError：赋值前引用的局部变量“cash”
我怎样才能解决这个问题？
问题是变量cash and coins只活在函数的“范围”内main，即在changeCounter. Try:
def main():
cash = float(input("How much money: "))
coins = 0
return cash, coins
def changeCounter(n, cash, coins):
while True:
if cash - n > 0:
cash -= n
coins += 1
else:
break
# return
return coins # presumably
cash, coins = main()
changeCounter(0.25, cash, coins)
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