Python – Replace Substrings from String List

06 Nov, 2021
Sometimes while working with data, we can have a problem in which we need to perform replace substrings with the mapped string to form a short form of some terms. This kind of problem can have applications in many domains involving data. Let’s discuss certain ways in which this task can be performed.
Method #1 : Using loop + replace() + enumerate() The combination of the above functions can be used to perform this task. In this, we perform the task of iteration using loop and enumerate() and replacement with a shorter form is done using replace().
Python3
# Python3 code to demonstrate# Replace Substrings from String List# using loop + replace() + enumerate() # Initializing list1test_list1 = ['GeeksforGeeks', 'is', 'Best', 'For', 'Geeks', 'And', 'Computer Science']test_list2 = [['Geeks', 'Gks'], ['And', '&'], ['Computer', 'Comp']] # printing original listsprint("The original list 1 is : " + str(test_list1))print("The original list 2 is : " + str(test_list2)) # Replace Substrings from String List# using loop + replace() + enumerate()sub = dict(test_list2)for key, val in sub.items():    for idx, ele in enumerate(test_list1):        if key in ele:            test_list1[idx] = ele.replace(key, val) # printing resultprint ("The list after replacement : " + str(test_list1))
The original list 1 is : ['GeeksforGeeks', 'is', 'Best', 'For', 'Geeks', 'And', 'Computer Science']
The original list 2 is : [['Geeks', 'Gks'], ['And', '&'], ['Computer', 'Comp']]
The list after replacement : ['GksforGks', 'is', 'Best', 'For', 'Gks', '&', 'Comp Science']
 
Method #2 : Using replace() + list comprehension This is another way in which this task can be performed. In this, we perform the task of replacing using the replace(), and the rest of the task is performed using list comprehension. It removes lists that don’t have replacements.
Python3
# Python3 code to demonstrate# Replace Substrings from String List# using replace() + list comprehension # Initializing list1test_list1 = ['GeeksforGeeks', 'is', 'Best', 'For', 'Geeks', 'And', 'Computer Science']test_list2 = [['Geeks', 'Gks'], ['And', '&'], ['Computer', 'Comp']] # printing original listsprint("The original list 1 is : " + str(test_list1))print("The original list 2 is : " + str(test_list2)) # Replace Substrings from String List# using replace() + list comprehensionres = [sub.replace(sub2[0], sub2[1]) for sub in test_list1      for sub2 in test_list2 if sub2[0] in sub] # printing resultprint ("The list after replacement : " + str(res))
The original list 1 is : ['GeeksforGeeks', 'is', 'Best', 'For', 'Geeks', 'And', 'Computer Science']
The original list 2 is : [['Geeks', 'Gks'], ['And', '&'], ['Computer', 'Comp']]
The list after replacement : ['GksforGks', 'Gks', '&', 'Comp Science']
 
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