OR
>>> L = [1, "term1", 3, "term2", 4, "term3", 5, "termN"] >>> [i for i in zip[*[iter[L]]*2]] [[1, 'term1'], [3, 'term2'], [4, 'term3'], [5, 'termN']]OR
>>> L = [1, "term1", 3, "term2", 4, "term3", 5, "termN"] >>> map[None,*[iter[L]]*2] [[1, 'term1'], [3, 'term2'], [4, 'term3'], [5, 'termN']] >>>Method 1: List Comprehension + tuple[]
Problem: How to convert a list of lists into a list of tuples?
Example: You’ve got a list of lists [[1, 2], [3, 4], [5, 6]] and you want to convert it into a list of tuples [[1, 2], [3, 4], [5, 6]].
Solution: There are different solutions to convert a list of lists to a list of tuples. Use list comprehension in its most basic form:
lst = [[1, 2], [3, 4], [5, 6]] tuples = [tuple[x] for x in lst] print[tuples] # [[1, 2], [3, 4], [5, 6]]Try It Yourself:
This approach is simple and effective. List comprehension defines how to convert each value [x in the example] to a new list element. As each list element is a new tuple, you use the constructor tuple[x] to create a new tuple from the list x.
If you have three list elements per sublist, you can use the same approach with the conversion:
lst = [[1, 2, 1], [3, 4, 3], [5, 6, 5]] tuples = [tuple[x] for x in lst] print[tuples] # [[1, 2, 1], [3, 4, 3], [5, 6, 5]]You can see the execution flow in the following interactive visualization [just click the “Next” button to see what’s happening in the code]:
And if you have a varying number of list elements per sublist, this approach still works beautifully:
lst = [[1], [2, 3, 4], [5, 6, 7, 8]] tuples = [tuple[x] for x in lst] print[tuples] # [[1,], [2, 3, 4], [5, 6, 7, 8]]You see that an approach with list comprehension is the best way to convert a list of lists to a list of tuples. But are there any alternatives?
Python | Convert a list into a tuple
Given a list, write a Python program to convert the given list into a tuple.
Examples:
Input : [1, 2, 3, 4] Output : [1, 2, 3, 4] Input : ['a', 'b', 'c'] Output : ['a', 'b', 'c']
Approach #1 : Using tuple[list_name].
Typecasting to tuple can be done by simply using tuple[list_name].
|
# Python3 program to convert a # list into a tuple def convert[list]: return tuple[list]
# Driver function list = [1, 2, 3, 4] print[convert[list]] |
Output:
[1, 2, 3, 4]
Approach #2 :
A small variation to the above approach is to use a loop inside tuple[] .
|
# Python3 program to convert a # list into a tuple def convert[list]: return tuple[i for i in list]
# Driver function list = [1, 2, 3, 4] print[convert[list]] |
Output: [1, 2, 3, 4]
Approach #3 : Using [*list, ]
This essentially unpacks the list l inside a tuple literal which is created due to the presence of the single comma [, ]. This approach is a bit faster but suffers from readability.
|
# Python3 program to convert a # list into a tuple def convert[list]: return [*list, ]
# Driver function list = [1, 2, 3, 4] print[convert[list]] |
Output: [1, 2, 3, 4]
Article Tags :
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Python – Convert List of Lists to Tuple of Tuples
Sometimes, while working with Python data, we can have a problem in which we need to perform interconversion of data types. This kind of problem can occur in domains in which we need to get data in particular formats such as Machine Learning. Let’s discuss certain ways in which this task can be performed.
Input : test_list = [[‘Best’], [‘Gfg’], [‘Gfg’]]
Output : [[‘Best’, ], [‘Gfg’, ], [‘Gfg’, ]]Input : test_list = [[‘Gfg’, ‘is’, ‘Best’]]
Output : [[‘Gfg’, ‘is’, ‘Best’], ]
Method #1 : Using tuple[] + list comprehension
The combination of above functions can be used to solve this problem. In this, we perform the conversion using tuple[] and list comprehension is used to extend logic to all the containers.
|
# Python3 code to demonstrate working of # Convert List of Lists to Tuple of Tuples # Using tuple + list comprehension
# initializing list test_list = [['Gfg', 'is', 'Best'], ['Gfg', 'is', 'love'], ['Gfg', 'is', 'for', 'Geeks']]
# printing original list print["The original list is : " + str[test_list]]
# Convert List of Lists to Tuple of Tuples # Using tuple + list comprehension res = tuple[tuple[sub] for sub in test_list]
# printing result print["The converted data : " + str[res]] |
Output :
The original list is : [[‘Gfg’, ‘is’, ‘Best’], [‘Gfg’, ‘is’, ‘love’], [‘Gfg’, ‘is’, ‘for’, ‘Geeks’]]
The converted data : [[‘Gfg’, ‘is’, ‘Best’], [‘Gfg’, ‘is’, ‘love’], [‘Gfg’, ‘is’, ‘for’, ‘Geeks’]]
Method #2 : Using map[] + tuple[]
The combination of above functions can be used to solve this problem. In this, we perform the task performed using list comprehension using map[], to extend the conversion logic to each sublist.
|
# Python3 code to demonstrate working of # Convert List of Lists to Tuple of Tuples # Using map[] + tuple[]
# initializing list test_list = [['Gfg', 'is', 'Best'], ['Gfg', 'is', 'love'], ['Gfg', 'is', 'for', 'Geeks']]
# printing original list print["The original list is : " + str[test_list]]
# Convert List of Lists to Tuple of Tuples # Using map[] + tuple[] res = tuple[map[tuple, test_list]]
# printing result print["The converted data : " + str[res]] |
Output :
The original list is : [[‘Gfg’, ‘is’, ‘Best’], [‘Gfg’, ‘is’, ‘love’], [‘Gfg’, ‘is’, ‘for’, ‘Geeks’]]
The converted data : [[‘Gfg’, ‘is’, ‘Best’], [‘Gfg’, ‘is’, ‘love’], [‘Gfg’, ‘is’, ‘for’, ‘Geeks’]]
Article Tags :
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Python Exercise: Convert a list to a tuple
Last update on January 29 2021 07:13:37 [UTC/GMT +8 hours]How to Convert a List into a Tuple in Python
June 27, 2021October 10, 2021 0 Comments convert list to tuple, how to convert a list into a tuple in python
In this tutorial, we are going to see how to convert List into a Tuple in Python. Python provides different types of variables for programmers. We can use data types like int, float, string, list, set… in our applications. When using different types of variables, it may be necessary to convert these to different types.
Output:
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