python 连接生成器和项目
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Concatenate generator and item
提问by TarGz
I have a generator (numbers) and a value (number). I would like to iterate over these as if they were one sequence:
我有一个生成器（数字）和一个值（数字）。我想迭代这些，就好像它们是一个序列：
i for i in tuple(my_generator) + (my_value,)
The problem is, as far as I undestand, this creates 3 tuples only to immediately discard them and also copies items in "my_generator" once.
问题是，据我所知，这会创建 3 个元组，只是为了立即丢弃它们，并且还会复制“my_generator”中的项目一次。
Better approch would be:
更好的方法是：
def con(seq, item):
for i in seq:
yield seq
yield item
i for i in con(my_generator, my_value)
But I was wondering whether it is possible to do it without that function definition
但我想知道是否可以在没有该函数定义的情况下做到这一点
回答by Mark Rushakoff
itertools.chaintreats several sequences as a single sequence.
itertools.chain将多个序列视为一个序列。
So you could use it as:
所以你可以将它用作：
import itertools
def my_generator():
yield 1
yield 2
for i in itertools.chain(my_generator(), [5]):
print i
which would output:
这将输出：
1
2
5
回答by Ignacio Vazquez-Abrams
回答by Arkady
Try itertools.chain(*iterables). Docs here: http://docs.python.org/library/itertools.html#itertools.chain
试试itertools.chain(*iterables)。文档在这里：http: //docs.python.org/library/itertools.html#itertools.chain
