誰能向我解釋為什么這段代碼有效：
data = "8 (including George Blake, aged 69, and Robert Reynolds, aged 12)"
chars = "()[]? "
for ch in chars:
if ch in data:
data = data.replace(ch,"")
print(data)
但是當我嘗試創建一個函式來對這段代碼做同樣的事情時，我得到的輸出是無：
def clean(data):
chars = "()[]? "
for ch in chars:
if ch in data:
data = data.replace(ch," ")
bob = "8 (including George Blake, aged 69, and Robert Reynolds, aged 12)"
print(bob)
output = clean(bob)
print(output)
uj5u.com熱心網友回復：
當您將資料作為引數傳遞給函式并宣告時data = data.replace(ch, "")，您正在修改引數，而不是傳遞給函式的原始資料。您應該嘗試return data在函式的末尾，然后將其值分配給輸出，例如：
def clean(data):
chars = "()[]? "
for ch in chars:
if ch in data:
data = data.replace(ch," ")
return data
bob = "8 (including George Blake, aged 69, and Robert Reynolds, aged 12)"
print(bob)
output = clean(bob)
print(output)
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