143,088 questions
-2
votes
1
answer
58
views
How to get sum of tuples using built-in function? [closed]
In Python 3 built-in function sum(iterable, /, start=0) allows to get the total from iterable.
start value is not allowed to be a string.
Ok, so we can call sum for lists (concatenation)
sum([[1,2,3],[...
- 337
0
votes
1
answer
101
views
mutating a column with `str_locate` only works correctly in a one-row data frame
I'm facing the following problem: I want to calculate the start positions of certain characters in a string and store them as additional columns in a data frame.
However, this only works if I have a ...
- 11.6k
0
votes
1
answer
117
views
Trouble cycling through values in a for loop and filling a list in R
I'm trying to estimate the population growth of a population with different growths rates, shown below
r <-c(0.5, 1.0, 1.5, 2, 2.5, 2.6, 2.7, 2.8, 2.9)
I'm trying to fill N_List with the ...
-6
votes
2
answers
98
views
Why does list iterator skip elements after in-place modification using slice assignment
I know that modifying a list while iterating over it is dangerous. For example, using my_list.remove() is a famous problem because it causes the iterator to skip the next element.
However, I found a ...
2
votes
2
answers
109
views
How to sort 1 list over 2 frames
Is it possible to sort 0:5 to frame 1, and sort 5:10 to frame 2 using one list?
Now it is clicking both radiobuttons in frame 1 and 2. I would like that only one can be selected at the time.
My code:
...
- 147
1
vote
1
answer
63
views
expected integer but got "none"
I have two lists, but I want them to work as one. So only one radiobutton can be activated at the time. I am trying to get them to print something without an error, but I keep getting an error because ...
- 147
9
votes
1
answer
402
views
List isn't expanding
These lists aren't expanding, only the last thing on the list is visible. My list works when I use it as pack. But I want to have 3 lists right next to each other with radiobuttons using grid. But I ...
- 147
2
votes
2
answers
118
views
Merge every element of 2 lists of lists
Suppose, we have 2 lists of lists:
a = [[1,2], [3,4]]
b = [[5,6], [7,8]]
We want to merge every element of the first list with every element of the second list and get:
c = [[1,2,5,6], [1,2,7,8], [3,...
- 24k
-1
votes
1
answer
129
views
How can I merge two lists in Python while removing duplicates but preserving the original order? [duplicate]
I have two lists in Python:
list1 = [1, 2, 3, 4]
list2 = [3, 4, 5, 6]
I want to merge them into a single list such that:
No duplicates remain
The original order of elements is preserved
For the ...
-5
votes
0
answers
44
views
Find first matching array index in Python, but using lambda helper function [duplicate]
I have a data structure like
arr = [
(2014, 0.21, 0.27),
(2015, 0.23, 0.27),
(2016, 0.25, None),
(2017, 0.25, None),
(2018, 0.27, None),
]
where I want to find the index of the ...
- 18.1k
0
votes
1
answer
56
views
RealmSwift: List not refreshing after changes on data
I've got a list in detail of a NavigationSplitView. The data is stored with RealmSwift.
@EnvironmentObject var realmService: RealmService
@ObservedRealmObject var selectedGroup: Group
@...
- 141
-3
votes
3
answers
109
views
list.pop('name') results in error: "str object cannot be interpreted as an integer"
I used the .pop() function to remove the guests, here is my code:
guests = ['Bill' , 'john' , 'jason' , 'fatima' , 'muhammed' , 'abdul']
print(guests)
guests.pop('jason')
guests.pop('bill')
print(...
1
vote
1
answer
106
views
How to extract a value from a list without getting “length 0” errors? [duplicate]
I’m parsing some JSON data in R and got this structure:
entry <- list("Ontario"="ON", "ON"="13.6")
When I try:
j <- entry["Ontario"]
population ...
- 11
0
votes
0
answers
56
views
How to properly use "limit" in AWS Amplify Gen2 list-function?
Please help me to understand how to properly and correctly use the list-function of AWS Amplify.
After running into many issues of existing data not being found/retrieved, I found out that if no "...
- 33
2
votes
1
answer
89
views
Sort each row of a pandas column consisting of delimited strings
CONTEXT
Let's say I have df, which consists of a column of delimited strings that I would like to sort.
import pandas as pd
df = pd.DataFrame({'sort_me':['foo; bar','foo; bar','bar; foo']})
df
...
- 1,645