All Questions
26 questions
0
votes
2
answers
32
views
TCL - A condition for an item while appending items to a list
I have this list
set csv [list]
lappend csv [list \
a \
b \
c \
[expr {[cfg::get enable_all_columns]
? {
d
}
: {}
}] \
e \
f \
g]
I need to add element d only if enable_all_columns is 1. The problem ...
- 1
-1
votes
1
answer
41
views
List assigning to another variable, then original variable also changes when there will happen an operation on child variable [duplicate]
a = [1,2,4]
b=a
b.insert(1,45)
print(a,b)
results
a = [1,45,2,4]
b = [1,45,2,4]
why a is changing
is there any way, where b will change
0
votes
1
answer
234
views
Insert an element at a specific position in a list at each video frame in python
I am struggling to get a list of 4 elements (so a fixed number of elements) at each frame, if in the detected frame I don't have 2 classes, the fixed list puts 0 to the counter.
this is my code :
...
- 9
-1
votes
1
answer
461
views
Append elem to a list replace all list element to the last item I append
I'm trying to fight really strange behaviour. I'm reading radio frames at my raspberry pi and each frame that I receive I append to the list. I noticed that appending specific element cause replacing ...
- 980
1
vote
4
answers
168
views
Set value of list item based on last defined value in list
I have a list of lists as follows.
ogList = [[a], [b], [], [], [c], [d], []]
I'd like each empty list to be populated like so, based on the last list which does have a value.
outputList = [[a], [b], [...
- 11
-1
votes
1
answer
106
views
What accounts for the “side effect” of appending items to a Python list by the insert() method? [duplicate]
I've seen the assertions: " It is not possible to insert at the end of the list with insert(), as that’s what the append method does”.
Here is a piece of Python code that shows some very peculiar ...
- 7
0
votes
4
answers
39
views
I have a list [(620.9, 234.5), (591.6, 205.4), (823.4, 205.8)]. After every element i want to insert an element(x,y) after every element
I want to insert element (x,y) in such a way that the list [(620.9, 234.5), (591.6, 205.4), (823.4, 205.8)] containing x and y cordinates becomes [(620.9, 234.5),(621.9, 234.5), (591.6, 205.4), (...
0
votes
1
answer
35
views
adding numpy arrays to specific indices of a list
I have a list of numpy arrays and want to add two more arrays as the first (0) and last (-1) indices of the list. These are my list and arrays:
import numpy as np
first_arr = np.array([1,1,1])
...
- 1,061
0
votes
2
answers
283
views
insert n in list x --> append list x to list y --> delete n in list x
I'm trying to insert the number "1" to the list in every position with a for loop and eventually get all possible lists in python.
For Example:
l = ["2","3","6"]...
- 7
0
votes
3
answers
93
views
How to insert a list into a list at a specific location?
I have a list as following
List_a = [1, 0, 0, 0, 1, 1]
I want to insert [0, 3] into index 1.
How it should look like:
New_List_a = [1, [0,3], 0, 0, 1, 1]
Any ideas?
- 49
0
votes
1
answer
22
views
Appending and inserting user input values to a list which dose not already have them included
drinksList = ["Fanta", "CocaCoal", "7up"]
userDrink = input("What soft drink are you looking for?")
if userDrink in drinksList:
print(userDrink,"is in ...
- 1
-3
votes
3
answers
993
views
How do I insert list in nested list [duplicate]
how do I insert list 'lst' into the first possition of the 'n_lst'?
n_lst = [['I', 'dont'], ['know', 'what']]
lst = ['whatever', 'whatever2']
what I need:
[['whatever', 'whatever2'], ['I', 'dont'], [...
1
vote
1
answer
636
views
How can i create list and add elements in python?
I am adding below readable code for creating a 'list' and all methods of add element. Here is the code:
Create list. Add element using append(),insert()
# Create lists
list1 = [1,4,6,8] # integer ...
0
votes
1
answer
61
views
Problem while inserting/appending to a list of lists
When I run the following code with n = 2, I'm getting answer = [[2, 2, 2], [1, 2], [2, 2, 2]].
n = int(input())
answer = [[1]]
for i in range(2, n+1):
t = [i]*((2*i)-3)
answer.insert(0,...
0
votes
2
answers
4k
views
How to put string variables into a Python array?
I'm rather new at this (it's my first question ha!), and my english isn't as good and technical as yours so I apologize in advance. That being said, I'm trying to fit string variables to an array but ...
-4
votes
7
answers
769
views
Problem related to Python insert() method
I make a list of the first 10 square numbers. Here’s how I might put the first 10 square numbers into a list:
square=[]
for i in range(1,10):
square.insert(-1,i**2)
print(square)
...
- 11
0
votes
1
answer
36
views
C ++ Cannot use insert to append values after a iteration on list
I have the following list, which prompts a user to write an student name, followed by a prompt for 3 grades in three exams obtained per student.
I would like to append the name of the student if his ...
- 464
5
votes
2
answers
12k
views
A way to insert a value in an empty List in a specific index
Is there a way to insert a specific value into a List into a specific index. List should be completely empty:
L = []
L.insert(2,177)
print(L)
L should give out the values of L [ , ,117].
user9935508
0
votes
1
answer
48
views
Try to make a function that will identify players and add two players' cards to left or right side
An empty list is given, and I am trying to make a function which will identify player so that player1's cards will be added to left side of the empty list, and player2's cards will be added to right ...
- 169
5
votes
4
answers
815
views
Why doesn't a.insert(-1, x) mimic a.append(x)?
So I have the following Python code, which appends numbers 1-10 to the list values:
values = []
for value in range(1, 11):
values.append(value)
print(values)
And, as expected, gives us [1, 2, ...
user7390608
3
votes
2
answers
1k
views
Insert an element in la list by index without moving others
I want to add elements to an empty list by index. For instance I want to add 4 to the 5th place of list a.
x = 4
a = []
in other languages like C++ I could create an array with 10 indices and all ...
- 79
0
votes
1
answer
38
views
Build a Loop that Sums Values and Adds to a List in a Certain Position in Python
I’m working on creating a loop that calculates income distribution based on tax returns. Let me give a simple example. Please keep in mind that this will only be a subset of the data I need to produce,...
- 71
2
votes
4
answers
24k
views
'NoneType' object has no attribute 'insert' Python List append insert
I have the following problem:
I create an array and then I turned it to a list, to which I want to add two more values. I have tried with append and with insert but I becoma the error message: '...
- 149
0
votes
1
answer
44
views
breaking appended list into indexes
So right now i have code that gives me
[-1], [1], [-1], [-1], [2], [3], [4], [-1], [5], [6], [7], [-1], [-1], [-1], [8], [9], [-1], [-1], [-1], [10]]
but i want it to look like so
myVV = [[-1, 1, -...
- 137
0
votes
1
answer
88
views
Compare N lists and insert/append blank entries where discrepancies exist
I'm attempting handle several long lists (around 2000 entries in each). The goal is to sort of "diff" the lists by looking at them side by side and seeing where differences exist.
Example:
a = ['...
0
votes
2
answers
142
views
Python: identical items in list are treated as the same
I have a nested list in python. Each item the second list is also a nested list. My goal is to duplicate one list, insert it right at the same index, and then modify each one. So, example of start ...
- 569