Recent questions tagged iterator

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iterator - what is meaning of [iter(list)]*2 in python?

I have found below code in web, result is tuple of two elements in list, how to understand [iter(list)]*2? lst = [1,2,3, ... , 2, 3), (4, 5, 6)] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - Implementing a "cautious" take_while using Peekable

I'd like to use Peekable as the basis for a new cautious_take_while operation that acts like take_while from IteratorExt ... I'm doing wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - Get first element from HashMap

I have a HashMap and need to get the first element: type VarIdx = std::collections::HashMap<u16, u8>; fn get_first_elem ... ^^ how can I fix it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - Difference between iter() and into_iter() on a shared, borrowed Vec?

I am reading the Rust 101 tutorial, where the author talks about shared borrowing with the example of a Vec object ... &vec); min.print(); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - "Cannot assign to immutable value" when trying to assign to a string + role

Starting with the example in the Iterable doc page role DNA does Iterable { method iterator(){ self.comb.iterator ... on some object. Any idea? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - Java - Iterating over every two elements in a list

What's the best way to iterate over a list while processing 2 elements at the same time? Example: List<String> strings ... 3] - Second [item 4] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - Why does Python's itertools.cycle need to create a copy of the iterable?

The documentation for Python's itertools.cycle() gives a pseudo-code implementation as: def cycle(iterable): # ... area of Python. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - What's the best way of skip N values of the iteration variable in Python?

In many languages we can do something like: for (int i = 0; i < value; i++) { if (condition) { i += ... (pythonic?) way of doing this in Python. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - ConcurrentModificationException (Java)

Exception in thread "main" java.util.ConcurrentModificationException Squash the PC dirties the room Violet. The room' ... to meet your requests. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - Using ListIterator to move back and forth over a LinkedList in Java

I have a LinkedList over which I need to iterate back and forth multiple times. I am using it to keep ... of cases and navigate through them? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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973 views

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iterator - I can't find imap() in itertools in Python

I have a problem that I want to solve with itertools.imap(). However, after I imported itertools in IDLE ... object has no attribute 'imap' See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - Why is there no first(iterable) built-in function in Python?

I'm wondering if there's a reason that there's no first(iterable) in the Python built-in functions, ... -circuiting on a positive match. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - Scala downwards or decreasing for loop?

In Scala, you often use an iterator to do a for loop in an increasing order like: for(i <- 1 to 10){ ... to 99).reverse) println(nBeers(b)) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - How do you iterate over a string by character

I have a string and I need to scan for every occurrence of "foo" and read all the text following it until a ... a contains() and find() method. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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491 views

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iterator - Python generator behaviour

import itertools ws=[] subs=[] set_subs=[] for i in xrange(int(raw_input())): S=raw_input() l=len(S) subs. ... xrange(i,l)]) is not an option See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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514 views

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iterator - How do I iterate over a Vec of functions returning Futures in Rust?

Is it possible to loop over a Vec, calling a method that returns a Future on each, and build a chain of ... iterator before moving to the next? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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400 views

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iterator - Stepping through all permutations one swap at a time

Given a list of n distinct items, how can I step through each permutation of the items swapping just one ... out solutions in most languages. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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568 views

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iterator - How do I "peek" the next element on a Java Scanner?

That is, how do I get the next element of the iterator without removing it? As I may or may not want to ... next() method. Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iterator - Iterating over Typescript Map

I'm trying to iterate over a typescript map but I keep getting errors and I could not find any solution yet ... . Has anyone had this Problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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628 views

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iterator - Ruby: How to iterate over a range, but in set increments?

So I'm iterating over a range like so: (1..100).each do |n| # n = 1 # n = 2 # n = 3 # n = 4 # ... n would actually be 10, then 20, 30, etc etc. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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491 views

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iterator - What is the technical definition of a Javascript iterable and how do you test for it?

I've been implementing a useful subclass of the ES6 Set object. For many of my new methods, I want to ... to access via that property name. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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547 views

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iterator - Iterating over and deleting from Hashtable in Java

I have a Hashtable in Java and want to iterate over all the values in the table and delete a particular key-value ... . How may this be done? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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762 views

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iterator - Using max_by_key on a vector of floats

I want to use max_by_key to get the maximum value from a vector of f64s based on a certain key. This is ... data. Are there any workarounds? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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735 views

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iterator - is it possible to filter on a vector in-place?

I'd like to remove some elements from a Vec, but vec.iter().filter().collect() creates a new vector with ... an extra capacity of the vector). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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947 views

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iterator - How do I create a Vec from a range and shuffle it?

I have the following code: extern crate rand; use rand::{thread_rng, Rng}; fn main() { let mut vec: Vec<u32> ... and couldn't get it to work. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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701 views

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iterator - Checking value exist in a std::map - C++

I know find method finds the supplied key in std::map and return an iterator to the element. Is there ... :map doing sequential search? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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642 views

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iterator - Feeding a Python list into a function taking in a vector with Boost Python

I've got a function with the signature: function(std::vector<double> vector); And I've exposed it, but it ... list->std::vector mapping occur? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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464 views

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iterator - Why do generators not support map()?

It seems utterly natural to me that generators, which function very much like Arrays, should support the very ... "the identity generator"? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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