generator Questions
7
Solved
The fringe of a binary tree is the sequence composed by its leaves, from
left to right. The same-fringe problem [Hewitt & Patterson, 1970]
consists of determining whether two binary trees have ...
Sefton asked 15/6 at 15:38
1
I'm not sure what the correct way is to early return in a function when using the yield keyword.
Is a "return void" return; the correct return value? Because the return type is specified to be ite...
2
Solved
Say I have a sequence of items and I want to perform a reduce operation via myReducer function (whatever it is). If my items are in an array (say myArray), it's easy:
myArray.reduce(myReducer);
...
Gavelkind asked 23/11, 2018 at 16:19
2
In R language version 4.4.1 (the version should not matter, just for the sake of discussion), we write the code :
set.seed(1234)
x <- 5
y <- rnorm(1, mean = x, sd = 0.1)
We will be able to ...
3
Solved
Python's contextlib provides wrappers to turn generators into context managers:
from contextlib import contextmanager
@contextmanager
def gen():
yield
with gen() as cm:
...
And generators prov...
4
Solved
Generator expressions is an extremely useful tool, and has a huge advantage over list comprehensions, which is the fact that it does not allocate memory for a new array.
The problem I am facing wi...
Product asked 23/3, 2018 at 10:24
4
What is the best way to document, for phpdocumentor2, a method that is a generator.
I don't think @return really works for yield, but I can't seem to find any proper alternative.
Is it just a mat...
11
Solved
This is rather the inverse of What can you use Python generator functions for?: python generators, generator expressions, and the itertools module are some of my favorite features of python these d...
Sauterne asked 29/10, 2008 at 4:25
11
Solved
I understand yield. But what does a generator's send function do? The documentation says:
generator.send(value)
Resumes the execution and “sends” a value into the generator function. The value ar...
4
Solved
Suppose I have some sort of proprietary web framework. Should I include a <meta generator="My framework"> tag in the generated files?
I noticed that StackExchange 0.9 applications do that, a...
6
Solved
Since Python 3.3, if a generator function returns a value, that becomes the value for the StopIteration exception that is raised. This can be collected a number of ways:
The value of a yield from ...
5
Solved
I am currently in a personal learning project where I read in an XML database. I find myself writing functions that gather data and I'm not sure what would be a fast way to return them.
Which is g...
Brockway asked 15/8, 2010 at 14:34
4
Is it possible to open parquet files and iterate line by line, using generators? This is to avoid loading the whole parquet file into memory.
The content of the file is pandas DataFrame.
9
Solved
The else block in a for/else clause gets executed if the iteration finishes but is not interrupted by break, so I read.
Is there a language construct which would let me write something which execu...
Zante asked 7/8, 2013 at 19:23
13
3
Solved
The french Sécurité Sociale identification numbers end with a check code of two digits. I have verified that every possible common transcription error can be detected, and found some other kinds of...
5
Solved
I'm looking for a way to reverse a generator object. I know how to reverse sequences:
foo = imap(seq.__getitem__, xrange(len(seq)-1, -1, -1))
But is something similar possible with a generator a...
2
Solved
I am using the following generator to calculate a moving average:
import itertools
from collections import deque
def moving_average(iterable, n=50):
it = iter(iterable)
d = deque(itertools.isli...
19
Solved
I can't figure out how to look ahead one element in a Python generator. As soon as I look it's gone.
Here is what I mean:
gen = iter([1,2,3])
next_value = gen.next() # okay, I looked forward and se...
3
Solved
What is the need for setting steps_per_epoch value when calling the function fit_generator() when ideally it should be number of total samples/ batch size?
Easing asked 21/12, 2017 at 15:46
2
Solved
I'm looping over a large file that I know the length of, but am processing lazily since it's too large to fit in memory. I'd like to be able to use tqdm to keep track of my progress through the fil...
9
Solved
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 ...
Fpc asked 19/1, 2011 at 21:55
1
Solved
Gurobipy can apparently read the index of a list comprehension formulated within the parentheses of a function. How does this work? Shouldn't this formulation pass a generator object to the functio...
Aileen asked 22/1 at 11:14
4
Solved
Given a list of pairs xys, the Python idiom to unzip it into two lists is:
xs, ys = zip(*xys)
If xys is an iterator, how can I unzip it into two iterators, without storing everything in memory?
...
Wizardly asked 12/6, 2015 at 14:3
5
Solved
I want to create an array from the values of an generator in JavaScript.
The generator creates a sequence of dynamic length like this
function* sequenceGenerator(minVal, maxVal) {
let currVal = m...
Plusch asked 11/8, 2016 at 15:19
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