On Mon, Jan 15, 2018 at 10:01 AM, Peng Yu <pengyu...@gmail.com> wrote:
> Hi,
>
> I see the following usage of list comprehension can generate a
> generator. Does anybody know where this is documented? Thanks.
>
> $ cat main.py
> #!/usr/bin/env python
>
> import sys
> lines = (line.rstrip('\n') for line in sys.stdin)
> print lines
>
> lines = [line.rstrip('\n') for line in sys.stdin]
> print lines
> $ seq 10 | ./main.py
> <generator object <genexpr> at 0x1101ecd70>
> ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10']
>When you use square brackets, you're creating a generator, as in your second example. Your first example is a slightly different beast called a "generator expression". If you search for that in the docs or on the web, you'll find what you want. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
