在Python中获取迭代器中的元素数量

iterator = iter(range(5))
list_from_iterator = list(iterator)
count = len(list_from_iterator)
print(count)  # 输出：5

from collections import Counter

iterator = iter(range(5))
counter = Counter(iterator)
count = sum(counter.values())
print(count)  # 输出：5

iterator = iter(range(5))
count = sum(1 for _ in iterator)
print(count)  # 输出：5