All Questions
Tagged with python-itertools python-2.7
138 questions
0
votes
1
answer
112
views
Create Permutations and Combinations of List in Python (Efficiently)
I want to create a list that contains every permutation of various combinations of elements satisfying a certain condition. Specifically, I want every list of a given length consisting of mostly zeros ...
- 1,290
0
votes
1
answer
75
views
Convert a list of list items to dict
I have list list like this
[[], ['1.0', '1.0 (proxy)', '1.1', '1.1 (proxy)', '2.0', '2.0 (proxy)', '3.0', '3.0 (proxy)'], ['1.0', '1.0 (proxy)', '1.1', '1.1 (proxy)', '2.0', '2.0 (proxy)', '3.0', '3.0 ...
- 631
1
vote
1
answer
438
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Ways of speeding up the itertools.product in python
I'm trying to create a numpy array consisting of all possible asset allocations using itertools.product.
The conditions are that allocations for each asset can be in range of zero to 100% and can rise ...
- 29
0
votes
1
answer
850
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Get itertools object by index, similar to how you get in list
Are there any quick ways that I can easily derive the index from an itertools.izip object, similar to how you derive from a list?
I am trying to compare 2 values, one from a list, the other from the ...
- 455
1
vote
1
answer
292
views
The first time I use next to get the elements in the iterator, an exception is thrown
There are two .py files
test.py
# coding=utf-8
from itertools import chain
def task():
c = [1, 21, 31, 4, 51, 61, 71]
d = ['a1', 'b1', 'c', 'd', 'e1', 'f', 'g1']
e = chain(c, d)
...
- 43
0
votes
3
answers
238
views
How to group dicts (compare dicts) based on all the keys?
I'm writing a python script which parses "n" number of xml's first and creates a dict of dict's with key-value being xml attributes (inside nested dicts).
Now, I want to group these nested dicts ...
- 101
-2
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3
answers
1k
views
Using zip_longest on unequal lists but repeat the last entry instead of returning None
There is an existing thread about this
Zipping unequal lists in python in to a list which does not drop any element from longer list being zipped
But it's not quite I'm after.
Instead of returning ...
- 25
0
votes
1
answer
349
views
Missing permutation with itertools.permutations()
I was solving the itertools.permutations() code on Hackerrank at https://www.hackerrank.com/challenges/itertools-permutations/problem and I came up with the following very simple code:
from itertools ...
- 99
1
vote
1
answer
193
views
printing characters before and after takewhile in python
I have a python list in which i need to do takewhile. I am getting output as
['fd', 'dfdf', 'keyword', 'ssd', 'sdsd'] but I need to get ['3=', 'fd', 'dfdf', 'keyword', 'ssd', 'sdsd', ';']
from ...
- 1,363
0
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1
answer
81
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How can we get range of dates (ex. from Jan 2000 to Dec 2010 ) in the format of 01012000-31122012) using itertools.permutations?
I am basically creating a bruteforcer in python
combos=itertools.permutations("i34U^hP-",8)
This is where I need to find the regex instead of that given inside the brackets.
- 21
0
votes
2
answers
114
views
Create lists with 3 levels, containing every combination of sub list(s) values
I am currently stuck with the following problem (I could not find solution already on here that really fitted this):
I have three lists a = [a, b, c], b = [1, 2, 3] and c = [0.1, 0.2, 0.3].
I would ...
- 11
1
vote
3
answers
1k
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Generate only continuous combinations of a list of numbers [duplicate]
I have a list in python [1, 2, 3, 4, 5, 6]. I want to generate all possible combinations of length 2, 3, 4 and 5. I have used itertools.combinations to generate the combinations but it doesn't ...
4
votes
2
answers
1k
views
itertools permutations and combinations
I am struggling with using itertools permutations and combinations together. Ultimately, I am trying to create a matrix of possible combinations of Customers across various permutations of machines. ...
- 41
1
vote
1
answer
420
views
Converting a string obtained from a Pandas dataframe into individual lists per line
test is a pandas dataframe converted to string.
strtest = (test.to_string())
print strtest
After conversion to string, I have the following output:
This is the first test file 98128612.12
This ...
- 67
0
votes
1
answer
427
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python: calling set over Itertools product object second time clear data [duplicate]
when calling set(c) second time it show empty set, it clear data butit working fine for first time and address of object is also same .
>>> import itertools
>>> a = ["aaa", "bbb", "...
- 3,543