mutable Questions
6
Solved
Can anyone help me solve this issue?
ImportError: dlopen(/Users/......./venv/lib/python3.6/site-packages/recordclass/mutabletuple.cpython-36m-darwin.so, 2): Symbol not found: __PyEval_GetBuiltinId...
Sportsmanship asked 19/3, 2020 at 16:22
10
Since Python's strings are immutable, it's inefficient to edit them repeatedly in loops. How can I use a mutable data structure to implement string operations, so as to avoid making lots of tempora...
19
Solved
I created a list of lists:
>>> xs = [[1] * 4] * 3
>>> print(xs)
[[1, 1, 1, 1], [1, 1, 1, 1], [1, 1, 1, 1]]
Then, I changed one of the innermost values:
>>> xs[0][0] = 5
...
Burford asked 27/10, 2008 at 14:57
20
I'm confused on what an immutable type is. I know the float object is considered to be immutable, with this type of example from my book:
class RoundFloat(float):
def __new__(cls, val):
return f...
Joletta asked 8/11, 2011 at 19:41
4
Editor's note: This question predates Rust 0.1 (tagged 2013-07-03) and is not syntactically valid Rust 1.0 code. Answers may still contain valuable information.
Does anyone know how to create mut...
Citizenship asked 27/10, 2012 at 18:9
4
Solved
I have a struct which I put in a List<T>, I want to edit some value in that struct at a specific position. Is this at all possible without making a copy of the struct, editing the copy, and r...
Wageworker asked 21/11, 2012 at 1:4
2
Solved
Example code could be found below or on godbolt. Say we have 4 classes:
S<T>: holding a data member.
SCtor<T>: holding a data member and has a template constructor.
SCtorMutable<T...
Craniotomy asked 28/6, 2023 at 10:4
8
Do you know of a Python library which provides mutable strings? Google returned surprisingly few results. The only usable library I found is http://code.google.com/p/gapbuffer/ which is in C but I ...
3
Solved
I have a list which is a private member in my class.
I have used getter and setter to get and set the values.
SOnar throws an error - Mutable members should not be stored or returned directly.
For...
7
Solved
I am still not sure about the rules of struct copy or reference.
I want to mutate a struct object while iterating on it from an array:
For instance in this case I would like to change the backgrou...
24
Solved
While using new_list = my_list, any modifications to new_list changes my_list every time. Why is this, and how can I clone or copy the list to prevent it?
5
Solved
I seems to miss some point in lambda mechanism in C++. Here is the code:
std::vector<int> vec (5);
int init = 0;
std::generate(begin(vec), end(vec), [init]() mutable { return ++init; });
f...
Germanize asked 14/5, 2016 at 0:43
14
Solved
Can anyone amend namedtuple or provide an alternative class so that it works for mutable objects?
Primarily for readability, I would like something similar to namedtuple that does this:
from Came...
Convolute asked 26/3, 2015 at 22:56
4
Solved
I have been playing around with dataclasses dynamically loaded with property names from a file and I am unable to find a way to create both 'frozen' and 'non-frozen' properties. I believe dataclass...
Stinko asked 23/10, 2019 at 23:58
5
Solved
I have a list:
val someList = listOf(1, 20, 10, 55, 30, 22, 11, 0, 99)
And I want to iterate it while modifying some of the values. I know I can do it with map but that makes a copy of the list.
...
4
Solved
How to do that without creating any new collections? Is there something better than this?
val m = scala.collection.mutable.Map[String, Long]("1" -> 1, "2" -> 2, "3" -> 3, "4" -> 4)
m.f...
Gushy asked 23/3, 2010 at 14:12
4
Solved
Here are two function signatures I saw in the Rust documentation:
fn modify_foo(mut foo: Box<i32>) { *foo += 1; *foo }
fn modify_foo(foo: &mut i32) { *foo += 1; *foo }
Why the differen...
4
Solved
I think I may be failing to understand how mutable collections work. I would expect mutable collections to be affected by applying map to them or adding new elements, however:
scala> val s: col...
Yaakov asked 2/8, 2011 at 9:17
3
Solved
Are Strings mutable in Ruby? According to the documentation doing
str = "hello"
str = str + " world"
creates a new string object with the value "hello world" but when we do
str = "hello"
str ...
Socinus asked 16/4, 2011 at 12:53
3
Solved
I couldn't find an answer in both stackoverflow and the Julia docs to the following "design problem":
Let's say I want to define the following object
struct Person
birthplace::String
age::Int
end...
Heterogamete asked 23/1, 2018 at 12:5
3
Solved
I'm new in Rust and i'm trying to allocate computational work to threads.
I have vector of strings, i would want to create to each string one thread to do his job. There's simple code:
use std::thr...
Doubleness asked 19/2, 2022 at 4:14
4
Solved
I would like to write a Python function that mutates one of the arguments (which is a list, ie, mutable). Something like this:
def change(array):
array.append(4)
change(array)
I'm more familia...
2
Solved
Is there a way to check if a type is mutable or immutable? Can this check be done at compile-time (i.e. have branches if ismutable(T) compile away to just use the codepath for either mutability or ...
2
Solved
In many cases, many member-functions could be specified 'const' - they don't modify any data-members of the class ...almost: they do lock/unlock the class mutex. Is it a good practice to specify, i...
5
Solved
According to the specification, strings that are used as a key to a hash are duplicated and frozen. Other mutable objects do not seem to have such special consideration. For example, with an array ...
1 Next >
© 2022 - 2025 — McMap. All rights reserved.