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Python | Binary Group Tuple list elements

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  • Last Updated : 11 Nov, 2019

Sometimes, while working with tuples, we can have problems of grouping them, be it based on gender or any particular binary category. This can have applications in many domains. Let’s discuss certain ways in which this can be performed.

Method #1 : Using generator + loop + zip()
The brute force method to perform this task, in this, we perform the combination grouping with the help of zip(), and iteration logic is handled by generator and loop.




# Python3 code to demonstrate working of
# Binary Group Tuple list elements
# using generator + loop + zip()
  
# helper function to perform task 
def bin_group(test_list):
     for tup1, tup2 in zip(test_list[0::2], test_list[1::2]):
             yield (tup1[0], tup1[1], tup2[1])
  
# initialize list 
test_list = [(1, 56, 'M'), (1, 14, 'F'), (2, 43, 'F'), (2, 10, 'M')]
  
# printing original list 
print("The original list : " + str(test_list))
  
# Binary Group Tuple list elements
# using generator + loop + zip()
res = list(bin_group(test_list))
  
# printing result
print("The list after binary grouping : " + str(res))

Output :

The original list : [(1, 56, 'M'), (1, 14, 'F'), (2, 43, 'F'), (2, 10, 'M')]
The list after binary grouping : [(1, 56, 14), (2, 43, 10)]

 

Method #2 : Using defaultdict() + list comprehension + sorted() + items()
Combination of above functions can be used to perform this task. In this, we convert the list into dictionary and then perform key based grouping and rearrange back to tuple list.




# Python3 code to demonstrate working of
# Binary Group Tuple list elements
# using defaultdict() + list comprehension + sorted() + items()
from collections import defaultdict
  
# initialize list 
test_list = [(1, 56, 'M'), (1, 14, 'F'), (2, 43, 'F'), (2, 10, 'M')]
  
# printing original list 
print("The original list : " + str(test_list))
  
# Binary Group Tuple list elements
# using defaultdict() + list comprehension + sorted() + items()
temp = defaultdict(list)
for ele in test_list:
    temp[ele[0]].append(ele[1])
res = sorted((key, ) + tuple(val) for key, val in temp.items())
  
# printing result
print("The list after binary grouping : " + str(res))

Output :

The original list : [(1, 56, 'M'), (1, 14, 'F'), (2, 43, 'F'), (2, 10, 'M')]
The list after binary grouping : [(1, 56, 14), (2, 43, 10)]

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