I’ve recently stumbled over this code: function xrange($min, $max) { for ($i = $min; $i <= $max; $i++) { yield $i; } } I’ve never seen this yield keyword before. Trying to run the code I get Parse error: syntax error, unexpected T_VARIABLE on line x So what is this yield keyword? Is it even … Read more
I’m trying to generate a new model and forget the syntax for referencing another model’s ID. I’d look it up myself, but I haven’t figured out, among all my Ruby on Rails documentation links, how to find the definitive source. $ rails g model Item name:string description:text (and here either reference:product or references:product). But the … Read more
That is, how do I express function *(next) {} with arrow syntax? I’ve tried all the combinations I could think of, and I can’t find any documentation on it. (I am currently using Node.js v0.11.14.) 7 Answers 7
I have a very big file 4GB and when I try to read it my computer hangs. So I want to read it piece by piece and after processing each piece store the processed piece into another file and read next piece. Is there any method to yield these pieces ? I would love to … Read more
This question already has answers here: How to get the n next values of a generator in a list (python) (5 answers) Closed 4 years ago. With linq I would var top5 = array.Take(5); How to do this with Python? 8 Answers 8
When should you use generator expressions and when should you use list comprehensions in Python? # Generator expression (x*2 for x in range(256)) # List comprehension [x*2 for x in range(256)] 12 s 12 John’s answer is good (that list comprehensions are better when you want to iterate over something multiple times). However, it’s also … Read more
What is the difference between iterators and generators? Some examples for when you would use each case would be helpful. 13 s 13 iterator is a more general concept: any object whose class has a __next__ method (next in Python 2) and an __iter__ method that does return self. Every generator is an iterator, but … Read more
Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. without enough detail may be edited or deleted. What is the use of the yield keyword in Python? What does it do? For example, I’m trying to understand this code1: def _get_child_candidates(self, distance, … Read more
