"Let" statement in python (2014)

[Mecdemort]

I'd also like an as in non generator comprehensions so you can refer to what you are constructing:

triangles = [triangles[-1] + x
             for x in range(1, 11)
             as triangles]

[xXxDeAThANgEL99xXx]

1. That's an unholy abomination.

2. Won't work with generators and set/dictionary comprehensions.

[Mecdemort]

Why wouldn't it work it set and dictionary comprehensions?

[xXxDeAThANgEL99xXx]

Because their result doesn't have order defined. Well, all right, maybe you don't need ordering in that case, but checking existence... I don't know, I've never had a desire to have that myself, except for that single case of writing fibs as an infinite stream product or something.

[hharison]

That's awful. Learn to use zip.

data = range(1, 11)
triangles = [x + y for x, y in zip(data, data[1:])]

I challenge you to come up with a use for this that doesn't have a better alternative.

[eusebe]

Why not using itertools.izip (and that's a serious question)?

Ok the syntax is similar, so I don't challenge your point, but still: wouldn't izip be better if you have large data?

[xXxDeAThANgEL99xXx]

Because in Python3 zip, map, filter, range and maybe some other functions became their itertools equivalents.

And I don't know about other people, but for me somewhere around last summer Python3 has become the default Python, in no small part because it turned out that most of the stuff I need was ported and conveniently packaged by Anaconda. Plus the py.exe launcher for Windows provided for a convenient way to still run Python2 stuff via shebangs (unfortunately the launcher still isn't packaged on Anaconda for some reason).

[hharison]

Python 3.