python list comprehensions - Single Line For Loops

List comprehensions provide a concise way to create lists.

[thing for thing in list_of_things]

[thing for thing in list_of_things if thing.xyz...]

for example

It can also be used in dict, inside {}

iterate dict
for k,v in d.items()

Now x is {1: 'a'}

set comprehensions
They are also similar to list comprehensions. The only difference is that they use braces {}. Here is an example:

http://blog.teamtreehouse.com/python-single-line-loops

https://docs.python.org/3.6/tutorial/datastructures.html search List Comprehensions