The interconversion between datatypes is a quite useful utility and many articles have been written to perform the same. This article discusses the interconversion between a tuple of characters to individual strings. This kind of interconversion is useful in Machine Learning in which we need to give the input to train the model in a specific format. Let’s discuss certain ways in which this can be done.
Method #1: Using list comprehension + join() The list comprehension performs the task of iterating the entire list of tuples and the join function performs the task of aggregating the elements of tuples into one list.
Python3
# Python3 code to demonstrate# conversion of list of tuple to list of list# using list comprehension + join()# initializing listtest_list = [('G', 'E', 'E', 'K', 'S'), ('F', 'O', 'R'), ('G', 'E', 'E', 'K', 'S')]# printing the original listprint("The original list is : " + str(test_list))# using list comprehension + join()# conversion of list of tuple to list of listres = [''.join(i) for i in test_list]# printing resultprint("The list after conversion to list of string : " + str(res)) |
The original list is : [('G', 'E', 'E', 'K', 'S'), ('F', 'O', 'R'), ('G', 'E', 'E', 'K', 'S')]
The list after conversion to list of string : ['GEEKS', 'FOR', 'GEEKS']
Time Complexity: O(n), where n is the length of the list test_list
Auxiliary Space: O(n) additional space of size n is created where n is the number of elements in the res list
Method #2: Using map() + join() The task performed by the list comprehension can be performed by the map function which can perform an extension of the logic of one tuple to all tuples in the list.
Python3
# Python3 code to demonstrate# conversion of list of tuple to list of list# using map() + join()# initializing listtest_list = [('G', 'E', 'E', 'K', 'S'), ('F', 'O', 'R'), ('G', 'E', 'E', 'K', 'S')]# printing the original listprint("The original list is : " + str(test_list))# using map() + join()# conversion of list of tuple to list of listres = list(map(''.join, test_list))# printing resultprint("The list after conversion to list of string : " + str(res)) |
The original list is : [('G', 'E', 'E', 'K', 'S'), ('F', 'O', 'R'), ('G', 'E', 'E', 'K', 'S')]
The list after conversion to list of string : ['GEEKS', 'FOR', 'GEEKS']
Method 3: Using format specifier
Python3
l=test_list = [('G', 'E', 'E', 'K', 'S'), ('F', 'O', 'R'),('G', 'E', 'E', 'K', 'S')]x=[('{}'*len(t)).format(*t).strip() for t in l]print(x) |
['GEEKS', 'FOR', 'GEEKS']
Method 4: Using enumerate function
Python3
test_list = [('G', 'E', 'E', 'K', 'S'), ('F', 'O', 'R'), ('G', 'E', 'E', 'K', 'S')]res = [''.join(i) for a, i in enumerate(test_list)]print("The list after conversion to list of string : " + str(res)) |
The list after conversion to list of string : ['GEEKS', 'FOR', 'GEEKS']
Method 5: Using functools.reduce method
Python
# Python3 code to demonstrate# conversion of list of tuple to list of list# using list comprehension + join()from functools import reduce# initializing listtest_list = [('G', 'E', 'E', 'K', 'S'), ('F', 'O', 'R'), ('G', 'E', 'E', 'K', 'S')]# printing the original listprint("The original list is : " + str(test_list))# using list comprehension + join()# conversion of list of tuple to list of listres = reduce(lambda a, b: a + [''.join(b)] if type(a) != tuple else [''.join(a)]+[''.join(b)], test_list)# printing resultprint("The list after conversion to list of string : ", res) |
The original list is : [('G', 'E', 'E', 'K', 'S'), ('F', 'O', 'R'), ('G', 'E', 'E', 'K', 'S')]
('The list after conversion to list of string : ', ['GEEKS', 'FOR', 'GEEKS'])
Time complexity: O(n^2), where n is the length of the input list of tuples.
Auxiliary space: O(n), where n is the length of the input list of tuples.
Method 6: Using a for loop
Using a for loop to iterate through the elements of the list and concatenate the characters into a string
Python3
test_list = [('G', 'E', 'E', 'K', 'S'), ('F', 'O', 'R'), ('G', 'E', 'E', 'K', 'S')]res = []for tuple in test_list: string = '' for char in tuple: string += char res.append(string)print("The list after conversion to list of string : " + str(res)) |
The list after conversion to list of string : ['GEEKS', 'FOR', 'GEEKS']
Time complexity: O(n^2), where n is the total number of characters in the input list.
Auxiliary space: O(n)
