我正在尝试向代码中添加python函数,但这样做时会出现UnboundLocalError:
Traceback (most recent call last):
File "/Users/name/Documents/project.py", line 44, in logic(coinType, 3.56, bagWeight, 356, 0.01)
File "/Users/name/Documents/project.py", line 14, in logic valueAddedCoins += value UnboundLocalError: local variable 'valueAddedCoins' referenced before assignment
def logic(coin_txt, w1, wBag, cWeight, vCoin):
diff = abs(wBag - cWeight)
if diff == 0:
print("Bag ok")
return
coins = diff / w1
value = coins * vCoin
if wBag < cWeight:
valueAddedCoins += value
print(int(coins), coin_txt, " coins missing")
print(diff, "grams too little")
else:
valueRemovedCoins += value
print(int(coins), coin_txt, " coins too many")
print(diff, " grams too many")
valueAddedCoins = 0
valueRemovedCoins = 0
numBagsChecked = 0
continueChecking = True;
while continueChecking:
#asking information about the coins and deducing wether or not the weight is correct
bagWeight = float(input("Weight of bag of coins (no unit): "))
coinType = input("Type of coins in bag: 1 pence or 2 pence?")
numBagsChecked += 1
if coinType == "1 pence":
logic(coinType, 3.56, bagWeight, 356, 0.01)
elif type_of_coin == "2 pence":
logic(coinType, 7.12, bagWeight, 712, 0.02)
check = input("Another bag? (Y/N): ")
if check == "N":
continueChecking = False
为什么会出现UnboundLocalError
变量valueaddCoins不在函数
logic
的范围内 参见主题的示例http://python-textbok.readthedocs.io/en/1.0/Variables_and_Scope.html要修改它,必须在函数内部将其声明为
global
:但这通常被认为是非常糟糕的做法,因为这样的代码通常很难调试(因为很难找出这些全局变量是在哪里修改的,bug是从哪里来的)
另一种方法是传入并返回修改后的值,如下所示:
这样你就会知道是什么修改了你的变量等
您可以添加
后定义函数
相关问题 更多 >
编程相关推荐