s.count(x) total number of occurrences of x in s 相同的序列类型还支持比较。具体地说,tuple和list通过字典顺序来比较对应的元素。这表示如果两个序列相等,则必须每个对应的元素都要相同,而且两个序列的类型和长度必须相同。(想参阅对应的详细信息,可以参考Comparisons )标记:1...
|copy(...)| L.copy() -> list --a shallow copy of L| |count(...)| L.count(value) -> integer --returnnumber of occurrences of value| |extend(...)| L.extend(iterable) -> None -- extend list by appending elementsfromthe iterable| |index(...)| L.index(value, [start, [stop...
To count objects, you typically use a counter, which is an integer variable with an initial value of zero. Then you increment the counter to reflect the number of times a given object appears in the input data source.When you’re counting the occurrences of a single object, you can use ...
count L.count(value)-> integer --returnnumber of occurrences of value extend L.extend(list)--extend list by appending list elements index L.index(value)-> integer --returnindex of first occurrence of value insert L.insert(index, object)--insert object before index pop L.pop([index])-> ...
count() 查询一个元素在 Tuple 中的数量 index() 查询元素在 Tuple 中的索引号 元组的遍历 enumerate() 枚举出序列对象的元素 序列 序列是一类基本数据类型(字符串/列表/元组)的统称,这些数据类型都含有一些共同的特性。例如:数据类型对象可以包...
23 """ L.count(value) -> integer -- return number of occurrences of value """ 24 return 0 25 26 def extend(self, iterable): 27 # real signature unknown; restored from __doc__ 28 """ L.extend(iterable) -> None -- extend list by appending elements from the iterable """ ...
..) | T.count(value) -> integer -- return number of occurrences of value | | index(...) | T.index(value, [start, [stop]]) -> integer -- return first index of value. | Raises ValueError if the value is not present.list和index方法的使用和list一模一样。
调用tuple#count函数 , 可以统计 元组 中指定元素 的个数 ; 函数原型如下 : 代码语言:javascript 复制 defcount(self,*args,**kwargs):# real signature unknown""" Return number of occurrences of value. """pass 代码示例 : 代码语言:javascript ...
def count(self, *args, **kwargs):""" Return number of occurrences of value. """# 返回值的出现次数。def extend(self, *args, **kwargs):""" Extend list by appending elements from the iterable. """# 通过从可迭代对象追加元素来扩展列表。def index(self, *args, **kwargs):"""Return ...
v = self[i] if v is value or v == value: return i except IndexError: break i += 1 raise ValueError def count(self, value):# 统计value的个数 'S.count(value) -> integer -- return number of occurrences of value' return sum(1 for v in self if v is value or v == value) ...