Sometimes, while working with data records we can have a problem in which we need to perform certain swap operation in which we need to change one element with other over entire string list. This has application in both day-day and data Science domain. Lets discuss certain ways in which this task can be performed.
Method #1 : Using replace() + list comprehension The combination of above functionalities can be used to perform this task. In this, we iterate through list using list comprehension and task of swapping is performed using replace().
Python3
# Python3 code to demonstrate# Swap elements in String list# using replace() + list comprehension# Initializing listtest_list = ['Gfg', 'is', 'best', 'for', 'Geeks']# printing original listsprint("The original list is : " + str(test_list))# Swap elements in String list# using replace() + list comprehensionres = [sub.replace('G', '-').replace('e', 'G').replace('-', 'e') for sub in test_list]# printing resultprint ("List after performing character swaps : " + str(res)) |
The original list is : ['Gfg', 'is', 'best', 'for', 'Geeks'] List after performing character swaps : ['efg', 'is', 'bGst', 'for', 'eGGks']
Time Complexity: O(n)
Auxiliary Space: O(n)
Method #2 : Using join() + replace() + split() The combination of above methods can also be used to perform this task. In this, the task of replace is same, but we use join() and split() with same parameter to perform task of list comprehension.
Python3
# Python3 code to demonstrate# Swap elements in String list# using replace() + join() + split()# Initializing listtest_list = ['Gfg', 'is', 'best', 'for', 'Geeks']# printing original listsprint("The original list is : " + str(test_list))# Swap elements in String list# using replace() + join() + split()res = ", ".join(test_list)res = res.replace("G", "_").replace("e", "G").replace("_", "e").split(', ')# printing resultprint ("List after performing character swaps : " + str(res)) |
The original list is : ['Gfg', 'is', 'best', 'for', 'Geeks'] List after performing character swaps : ['efg', 'is', 'bGst', 'for', 'eGGks']
Time Complexity: O(n)
Auxiliary Space: O(n)
Method #3 : Using regex
This task can also be performed using regex. We use sub() method which is used to perform search and replace operation and replace one character with other using regex.
Python3
# Python3 code to demonstrate# Swap elements in String list# using regex# Initializing listimport retest_list = ['Gfg', 'is', 'best', 'for', 'Geeks']# printing original listsprint("The original list is : " + str(test_list))# Swap elements in String list# using regexres = [re.sub('-', 'e', re.sub('e', 'G', re.sub('G', '-', sub))) for sub in test_list]# printing resultprint("List after performing character swaps : " + str(res)) |
The original list is : ['Gfg', 'is', 'best', 'for', 'Geeks'] List after performing character swaps : ['efg', 'is', 'bGst', 'for', 'eGGks']
Time Complexity: O(n)
Auxiliary Space: O(n)
