27 questions
1
vote
1
answer
82
views
Python3.8 cannot import name 'windowed_complete'
Ubuntu 20.04
Python 3.8
Got error
ImportError: cannot import name 'windowed_complete' from 'more_itertools'
However more_itertools is clearly installed.
Is it possible, that Python 3.9 required to ...
- 97
1
vote
1
answer
49
views
Find if a set of lists of 2 values are the result of the possible combination of a n-value list
I have used itertools to find all possible 2-element combination (without repetition) from a set of 10 elements to which I have applied some filtering to reduce the 2-element combination based on ...
- 327
-1
votes
2
answers
33
views
How to group or batch the list of elements based on indices sublist?
How to group or batch the list of elements based on indices sublist ?
Below are the possible instances should be considered. Hope that helps better.
1st Instance : Length of elements == sum of all ...
- 91
0
votes
1
answer
89
views
(more_)itertools function to group (predicate true/false) tuples with group borders at first item in group
I'm looking for an iterator preferably from itertools or more_itertools that groups my_list such that each group starts at the first even digit that follows after an odd digit (or has no predecessor).
...
- 1,840
0
votes
2
answers
161
views
How to generate permutations without repetition
I have a table that looks like below
Loc
ID
filter
P1
A
ABC1
GHY
55.6
A
DFT1
FGH
67.8
B
HJH5
GHY
67
C
HKL
BHY
78
B
GTY
FGH
60
I want the output as below. Basically, I want the records with the ...
- 47
1
vote
1
answer
130
views
efficiently listing distinctive permutations that meet 'adjecancy requirements'
I'm trying to store distinctive permutations that meet additional (adjecancy) requirements. Below is a figure to illustrate the problem I am trying to solve.
I'm trying to make code that lists all ...
- 67
0
votes
1
answer
143
views
Parsing an iterable without listifying each chunk
Suppose I want to achieve a splitting of a Python iterable, without listifying each chunk, similar to itertools.groupby, whose chunks are lazy. But I want to do it on a more sophisticated condition ...
- 1,244
2
votes
1
answer
903
views
All possible paths from pair combinations
I don't know the proper name for this connected component, yet what I'm looking for is to form paths with all possible combinations of a list of pairs/edges. Given a list:
("A", "B"...
- 2,420
0
votes
1
answer
44
views
Return large list of tuples with replaced dictionary value
In python, I have a list of tuples (lot) with patient data, as shown below:
lot = [('490001', 'A-ARM1', '1', '2', "a", "b"),
('490001', 'A-ARM2', '3', '4', "c", &...
- 85
1
vote
1
answer
36
views
Replace two characters in tuple element with dictionary value
I have a list of tuples (lot):
lot = [('490001', 'A-ARM1'),
('490001', 'A-ARM2'),
('490002', 'B-ARM3')]
Subsequently, I loop through every second tuple element and wish to replace every ...
- 85
1
vote
4
answers
770
views
In Python, how do I iterate over previous, current and next values of a given list?
I don't even know where to begin to provide an adequate title for this question. Please suggest something better if you can.
EDIT:
Sorry, I need to clarify my question. I'm looking for something that ...
- 105
0
votes
2
answers
91
views
use only part of the data premutation
import itertools
alphabet = {
"A": 1,
"B": 2,
"C": 3,
"D": 4,
"E": 5,
"F": 6,
"G": 7,
"H&...
5
votes
3
answers
905
views
How to elegantly generate all prefixes of an iterable? (cumulative iterable) [closed]
From an iterable, I'd like to generate an iterable of its prefixes (including the original iterable itself).
for prefix in prefixes(range(5)):
print(tuple(prefix))
should result in
(0,)
(0, 1)
(0,...
- 9,964
2
votes
1
answer
92
views
Skipping an Iteration in a Specific List when Iterating through Multiple Lists
This question is somewhat similar to this question, but different in that it entails multiple lists:
I have three lists:
a = [1, 2, 3, 4, 5, 6, 7]
b = ['ball', 'cat', 'dog', 'elephant', 'baboon', '...
- 517
0
votes
4
answers
554
views
How to introduce constraints using Python itertools.product()?
The following script generates 4-character permutations of set s and outputs to file:
import itertools
s = ['1', '2', '3', '4', '!']
l = list(itertools.product(s, repeat=4))
with open('output1.txt',...
- 4,315
0
votes
1
answer
287
views
How to remove string quotations, commas and parenthesis from Python itertools output?
This nice script generates all 4 character permutations of the given set s, and prints them on new lines.
import itertools
s = ('7', '8', '-')
l = itertools.product(s, repeat=4)
print(*l, sep='\n')
...
- 4,315
2
votes
3
answers
733
views
Pure python or itertools group a list of dates by days difference between each date
Having a list of dates ordered:
[
datetime.date(2006, 8, 15),
datetime.date(2006, 9, 12),
datetime.date(2007, 8, 10),
datetime.date(2021, 4, 6),
datetime.date(2021, 4, 16),
datetime.date(2021, 4, 19)
....
- 33
0
votes
6
answers
1k
views
How to convert a nested list of strings to a one list? [duplicate]
I wanted to convert a nested list of strings into a single list.
For example,
if there is a list like,
fruits = ['apple','orange, ['pineapple','grapes']]
I want to convert this to:
fruits = ['apple','...
2
votes
1
answer
8k
views
Can't `pip install numpy` with a Python 3.9 venv
I installed Python 3.9, created a venv and tried to install numpy. There was an error with Cython, that was fixed in trunk.
So I installed in the venv Cython 3.0a0 and retried:
(venv) marco@buzz:~...
- 15.9k
0
votes
0
answers
135
views
How to make delimited item in split_at (more_itertools) dynamic
I am using split_at from more_itertools. The reason is that I have a list of 70k records in which Record i [Record 1, Record 2, ...Record n] occurs. I need to split the list at these Record i ...
- 55
1
vote
0
answers
84
views
Looking for something like more_itertools random_product, but it must consider each iteration only once
I'm not sure if this is even possible, but basically I'm looking for something like "random_product" from more_itertools but I would like it to consider each iteration only once -- yet still consider ...
- 41
3
votes
2
answers
942
views
How can i return the longest continuous occurrence of "True" in Boolean, and replace other True with False?
I am trying to return a boolean which only gives the longest "True" occurrence in the original boolean and replace shorter "True" chunks into "False". Example a=[True, True, False, True , True, True, ...
- 45
3
votes
2
answers
1k
views
Python join more_itertools.windowed results
I have a following problem: I am trying to create so-called "digrams", like this:
If I have a word foobar, I want to get a list or a generator like: ["fo", "oo", "ob", "ba", "ar"]. The perfect ...
- 1,917
10
votes
1
answer
6k
views
Invalid syntax in more-itertools when running pytest
I have the following minimal setup.py:
import setuptools
setuptools.setup(
setup_requires=['pytest-runner'],
tests_require=['mock', 'pytest'],
test_suite='tests',
python_requires='&...
- 4,504
0
votes
3
answers
100
views
python shuffle and print string and without reverse string
Let's say I have string, s='AADD'. I have used more_itertools and distinct permutation, which would print out (AADD,ADDA,DDAA,ADAD,DADA,DAAD).
My question is, because AADD and DDAA, ADAD and DADA ...
- 48
0
votes
1
answer
2k
views
ImportError: cannot import name 'unique_everseen'
I'm trying to import quandl in to spyder (python 3.6) and I get the issues as seen in the title above. Could it be a fault with the more-itertools package, as I have not seen a file within the ...
- 245
0
votes
0
answers
106
views
Infinite while loop using conditional statements and peekable iterables?
I'm getting an infinite loop while using more_itertools peekable:
import more_itertools as it
temp = [line.rstrip('\n') for line in open('sample.txt')]
lines = it.peekable(temp)
try:
while True:...
- 61