All Questions
71,452 questions
-3
votes
1
answer
71
views
How to remove duplicates from a list in Python while preserving order? [duplicate]
I'm trying to remove duplicate items from a list in Python, but I want to preserve the original order of the elements.
For example:
my_list = [1, 3, 2, 3, 1, 5, 2]
I tried using set() to remove ...
-5
votes
1
answer
77
views
Separating/Adding lists together for a 2D array [closed]
I have a list of numbers and need to analyze them in two different ways.
[[ 0, 1, 0, 1, 0], [1, 1, 1, 1, 1], [ 0, 1, 1, 1, 0]]
I need to add up any 1's and group them but ONLY if they're after each ...
- 29
1
vote
3
answers
89
views
Generating all length-N combinations of all length-M sublists of a list, without repetitions
I have a long input list, and I want to generate combinations of 3 elements. But each combination's elements should be drawn from a length-5 sublist of the original list, rather than drawing elements ...
- 11
-1
votes
0
answers
33
views
How to delete element from python list in loop over this list [duplicate]
I have time segments in list such as:
[{'start': 12.4, 'end': 12.8}, {'start': 14.0, 'end': 15.5}, {'start': 15.7, 'end': 16.2}, {'start': 16.5, 'end': 17.1}, {'start': 17.9, 'end': 18.5}, {'start': ...
-2
votes
0
answers
36
views
"What's the difference between using append() vs extend() when working with Python lists?" [duplicate]
I'm currently learning Python and working with lists. I came across two methods—append() and extend()—and I'm a bit confused about how they're different.
For example:
a = [1, 2, 3]
b = [4, 5]
a....
-4
votes
0
answers
49
views
How can I convert a list of numbers in various decimals to two decimal places [duplicate]
I have a code that calculate the growth of population as follows:
new_pop = init_pop
new_pop_list = [new_pop]
while new_pop <= 1500:
new_pop *= (1 + growth_rate)
new_pop_list.append(round(...
- 1,268
1
vote
0
answers
58
views
Is it possible to use (python) list comprehension in this case? [duplicate]
a = []
for b in c:
try:
a.append(SomeClass.SomeMethod(doc,b).Name)
except:
a.append(None)
Chat GPT suggested this.. but it fails to work
a = [ SomeClass.SomeMethod(doc,b)....
- 43
-2
votes
0
answers
34
views
Pythonic way to create a list of repeated different mutable objects [duplicate]
I want a list of five lists:
c = [[],]*5
but unfortunately:
c[0].append(1)
print(c)
gives this unwanted result:
[[1], [1], [1], [1], [1]]
is there a way better than:
[[] for _ in range(5)]
enter ...
- 5,558
5
votes
2
answers
153
views
Algorithm for detecting full loop when iterating over a list
Assignment:
Write a funcion cycle_sublist(lst, start, step) where:
lst is a list
start is number that satisfies: 0 <= start < len(lst)
step is the amount we increase your index each iteration
...
- 382
1
vote
1
answer
90
views
Using a list of values to select rows from Polars DataFrame
I have a Polars DataFrame below:
import polars as pl
df = pl.DataFrame({"a":[1, 2, 3], "b":[4, 3, 2]})
>>> df
a b
i64 i64
1 4
2 3
3 2
I can subset ...
- 316
-2
votes
0
answers
33
views
Indirectly calling a list In Python [duplicate]
I want to fill a list by indirectly calling another list (it's called "indirect addressing" in PLCs, not sure what it's called in Python).
The name of the list I want to fill is Factor_Data. ...
4
votes
1
answer
103
views
Why does sort() with key function not do anything while sorted() is working?
I have a list of integers with duplicates and I need to sort it by the number of these duplicates.
For example:
input: n = [2, 4, 1, 2]
output: n = [4, 1, 2, 2]
I wrote some code and noticed, that ...
- 43
0
votes
3
answers
86
views
How best to insert a separator between list elements (but not at the beginning or end) in Python? [duplicate]
I'm a beginner, practicing Python, I want to understand if one or the other way is better version. If yes, please elaborate!
And how to determine the same in future, on my own?
words = ['This', 'is', '...
-5
votes
1
answer
53
views
Fastest and cleaner ways to insert, update, delete 2-dimensional array [duplicate]
I'm newbie in python language and have some prolem here. I have a list of name and score for example:
score = [['Andy', 80], ['John', 70], ['Diana', 100]]
I want to Delete or Update score based on it'...
- 365
-1
votes
1
answer
48
views
Use pop function to catch a value and then add them
I was using pop function to catch a value and then add them as below
my_list = [1,2,3,4,5]
a = my_list.pop(0)
b = my_list.pop(0)
c = a+b
print(c)
I was expecting the output as 2 but it shows it as ...
- 21