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Python | Convert Lists to column tuples
  • Last Updated : 29 Oct, 2019

Sometimes, while working with data, we can have a problem in which we need to get alike index elements in a single container. This means the columns of Matrix/Multiple lists need to be converted to list of tuples, each comprising of like index elements. Let’s discuss certain ways in which this task can be done.

Method #1 : Using zip() + list comprehension
The combination of above functions can work together to achieve this particular task. In this, we combine the like index elements into column using zip(), and binding all tuples into a list and iteration of dictionary lists is performed by list comprehension.




# Python3 code to demonstrate working of
# Convert Lists to column tuples
# using zip() + list comprehension
  
# initialize dictionary
test_dict = {'list1' : [1, 4, 5], 
             'list2' : [6, 7, 4],
             'list3' : [9, 1, 11]}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Convert Lists to column tuples
# using zip() + list comprehension
res = list(zip(*(test_dict[key] for key in test_dict.keys())))
  
# printing result
print("Like index column tuples are : " + str(res))
Output :

The original dictionary is : {‘list3’: [9, 1, 11], ‘list2’: [6, 7, 4], ‘list1’: [1, 4, 5]}
Like index column tuples are : [(9, 6, 1), (1, 7, 4), (11, 4, 5)]

 



Method #2 : Using zip() + values()
The combination of above functions can be used to perform this task. In this, we access the values of dictionary values using the values() and aggregating columns can be done using zip().




# Python3 code to demonstrate working of
# Convert Lists to column tuples
# using zip() + values()
  
# initialize dictionary
test_dict = {'list1' : [1, 4, 5], 
             'list2' : [6, 7, 4], 
             'list3' : [9, 1, 11]}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Convert Lists to column tuples
# using zip() + values()
res = list(zip(*test_dict.values()))
  
# printing result
print("Like index column tuples are : " + str(res))
Output :

The original dictionary is : {‘list3’: [9, 1, 11], ‘list2’: [6, 7, 4], ‘list1’: [1, 4, 5]}
Like index column tuples are : [(9, 6, 1), (1, 7, 4), (11, 4, 5)]

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