I have a generator object returned by multiple yield. Preparation to call this generator is rather time-consuming operation. That is why I want to reuse the generator several times. y = FunctionWithYield() for x in y: print(x) #here must be something to reset ‘y’ for x in y: print(x) Of course, I’m taking in mind … Read more
How can I build a numpy array out of a generator object? Let me illustrate the problem: >>> import numpy >>> def gimme(): … for x in xrange(10): … yield x … >>> gimme() <generator object at 0x28a1758> >>> list(gimme()) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> numpy.array(xrange(10)) array([0, 1, 2, … Read more
In python, how do I check if an object is a generator object? Trying this – >>> type(myobject, generator) gives the error – Traceback (most recent call last): File “<stdin>”, line 1, in <module> NameError: name ‘generator’ is not defined (I know I can check if the object has a next method for it to … Read more
Is there a simple way of testing if the generator has no items, like peek, hasNext, isEmpty, something along those lines? 24 Answers 24
Can someone give me an example of why the “send” function associated with Python generator function exists? I fully understand the yield function. However, the send function is confusing to me. The documentation on this method is convoluted: generator.send(value) Resumes the execution and “sends” a value into the generator function. The value argument becomes the … Read more
The typical way to loop x times in JavaScript is: for (var i = 0; i < x; i++) doStuff(i); But I don’t want to use the ++ operator or have any mutable variables at all. So is there a way, in ES6, to loop x times another way? I love Ruby’s mechanism: x.times do … Read more
I’m starting to learn Python and I’ve come across generator functions, those that have a yield statement in them. I want to know what types of problems that these functions are really good at solving. 16 Answers 16
I want to change the following code for directory, dirs, files in os.walk(directory_1): do_something() for directory, dirs, files in os.walk(directory_2): do_something() to this code: for directory, dirs, files in os.walk(directory_1) + os.walk(directory_2): do_something() I get the error: unsupported operand type(s) for +: ‘generator’ and ‘generator’ How to join two generators in Python? 13 Answers 13
I am reading the Python cookbook at the moment and am currently looking at generators. I’m finding it hard to get my head round. As I come from a Java background, is there a Java equivalent? The book was speaking about ‘Producer / Consumer’, however when I hear that I think of threading. What is … Read more
I have a generator function like the following: def myfunct(): … yield result The usual way to call this function would be: for r in myfunct(): dostuff(r) My question, is there a way to get just one element from the generator whenever I like? For example, I’d like to do something like: while True: … … Read more
