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Python | K Division Grouping

  • Last Updated : 10 Feb, 2020

Sometimes, we have a problem in which we need to deal with the grouping of elements. These groupings are comparatively easier while working with the databases, but using languages, this can be tricky. Let’s discuss certain ways to perform the grouping in Python by K.

Method #1 : Using loops
This is the brute force method to perform this particular task. In this we use loops to have each number’s K’s place and add that number to designated list.




# Python3 code to demonstrate
# K Division Grouping
# using loops
  
# initializing list
test_list = [3, 12, 13, 22, 25, 30]
  
# printing original list
print("The original list : " + str(test_list))
  
# initializing K 
K = 7
  
# using loops
# K Division Grouping
res = []
dec = -1
for num in sorted(test_list):
    while num // K != dec:
        res.append([])
        dec += 1
    res[-1].append(num)
  
# print result
print("The list after grouping by K is : " + str(res))
Output :
The original list : [3, 12, 13, 22, 25, 30]
The list after grouping by K is : [[3], [12, 13], [], [22, 25], [30]]

 

Method #2 : Using list comprehension + max() + min()
Another method to perform this particular task in a shortened way is by using list comprehension. The min and max function specify the number of lists required as inner lists and rest of the task is performed inside the list comprehension.




# Python3 code to demonstrate
# K Division Grouping
# using list comprehension + min() + max()
  
# initializing list
test_list = [3, 12, 13, 22, 25, 30]
  
# printing original list
print("The original list : " + str(test_list))
  
# initializing K 
K = 7
  
# using list comprehension + min() + max()
# K Division Grouping
temp = sorted(test_list)
res = [[ele for ele in temp if ele // K == sub] for sub in range(min(test_list) // K, (max(test_list) // K) + 1)]
  
# print result
print("The list after grouping by K is : " + str(res))
Output :
The original list : [3, 12, 13, 22, 25, 30]
The list after grouping by K is : [[3], [12, 13], [], [22, 25], [30]]

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