python–te tools . tee()
哎哎哎:# t0]https://www . geeksforgeeks . org/python-tertools-tee/
在 Python 中，Itertools 是内置的模块，允许我们以有效的方式处理迭代器。它们使得遍历像列表和字符串这样的数据项变得非常容易。一个这样的 itertools 函数是 filterfalse()。
注:更多信息请参考 Python Itertools
三通()功能
这个迭代器将容器分成参数中提到的多个迭代器。
语法:
tee(iterator, count)
参数:这个方法包含两个参数，第一个参数是迭代器，第二个参数是整数。 返回值:这个方法返回参数中提到的迭代器个数。
例 1:
# Python code to demonstrate the working of tee()
# importing "itertools" for iterator operations
import itertools
# initializing list
li = [2, 4, 6, 7, 8, 10, 20]
# storing list in iterator
iti = iter(li)
# using tee() to make a list of iterators
# makes list of 3 iterators having same values.
it = itertools.tee(iti, 3)
# printing the values of iterators
print ("The iterators are : ")
for i in range (0, 3):
print (list(it[i]))
输出:
The iterators are :
[2, 4, 6, 7, 8, 10, 20]
[2, 4, 6, 7, 8, 10, 20]
[2, 4, 6, 7, 8, 10, 20]
例 2:
# Python code to demonstrate the working of tee()
# importing "itertools" for iterator operations
import itertools
# using tee() to make a list of iterators
iterator1, iterator2 = itertools.tee([1, 2, 3, 4, 5, 6, 7], 2)
# printing the values of iterators
print (list(iterator1))
print (list(iterator1))
print (list(iterator2))
输出:
[1, 2, 3, 4, 5, 6, 7]
[]
[1, 2, 3, 4, 5, 6, 7]
例 3:
# Python code to demonstrate the working of tee()
# importing "itertools" for iterator operations
import itertools
# using tee() to make a list of iterators
for i in itertools.tee(['a', 'b', 'c', 'd', 'e', 'f', 'g'], 4):
# printing the values of iterators
print (list(i))
输出:
['a', 'b', 'c', 'd', 'e', 'f', 'g']
['a', 'b', 'c', 'd', 'e', 'f', 'g']
['a', 'b', 'c', 'd', 'e', 'f', 'g']
['a', 'b', 'c', 'd', 'e', 'f', 'g']
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