星操作員是什么意思？是什么*運算符在Python中的意思，例如在類似的代碼中zip(*x)或f(**k)?它是如何在解釋器內部處理的？它會影響性能嗎？是快還是慢？什么時候有用，什么時候沒用？應該在函數聲明或調用中使用它嗎？
3 回答
開心每一天1111
TA貢獻1836條經驗 獲得超13個贊
*
def sum(a, b): return a + b values = (1, 2)s = sum(*values)
s = sum(1, 2)
**
values = { 'a': 1, 'b': 2 }s = sum(**values)def sum(a, b, c, d):
return a + b + c + d
values1 = (1, 2)values2 = { 'c': 10, 'd': 15 }s = sum(*values1, **values2)s = sum(1, 2, c=10, d=15)
*x**y
def sum(*values): s = 0 for v in values: s = s + v return s s = sum(1, 2, 3, 4, 5)
**:
def get_a(**values): return values['a']s = get_a(a=1, b=2) # returns 1
def sum(*values, **options): s = 0 for i in values: s = s + i if "neg" in options: if options["neg"]: s = -s return s s = sum(1, 2, 3, 4, 5) # returns 15s = sum(1, 2, 3, 4, 5, neg=True) # returns -15s = sum(1, 2, 3, 4, 5, neg=False) # returns 15
添加回答
舉報
0/150
提交
取消