Python Program that prints elements common at specified index of list elements
Given a list of strings, the task is to write a Python program to extract all characters that are same at a specified index of each element of a list.
Input : test_list = [“geeks”, “weak”, “beak”, “peek”]
Output : [‘e’, ‘k’]
Explanation : e and k are at same at an index on all strings.Input : test_list = [“geeks”, “weak”, “beak”, “peer”]
Output : [‘e’]
Explanation : e is at same at an index on all strings.
Method 1 : Using min(), len() and loop
In this, initially minimum length string is extracted to check indices to iterate to ensure all indices in strings. Then each index is checked for similar character using loop, if found, character is appended to result.
Python3
# initializing Matrixtest_list = ["geeks", "weak", "beak", "peek"] # printing original listprint("The original list is : " + str(test_list)) # getting min length stringmin_len = min(len(ele) for ele in test_list) res = []for idx in range(0, min_len): flag = True for ele in test_list: # checking for all equal columns if ele[idx] != test_list[0][idx]: flag = False break if flag: res.append(test_list[0][idx]) # printing resultprint("Extracted similar characters : " + str(res)) |
Output:
The original list is : [‘geeks’, ‘weak’, ‘beak’, ‘peek’]
Extracted similar characters : [‘e’, ‘k’]
Method 2 : Using all(), min(), len() and loop
In this, we perform the task of checking all elements to match using all(), reducing a nested loop, increasing readability.
Python3
# initializing Matrixtest_list = ["geeks", "weak", "beak", "peek"] # printing original listprint("The original list is : " + str(test_list)) # getting min length stringmin_len = min(len(ele) for ele in test_list) res = []for idx in range(0, min_len): # using all() for condition injection if all(ele[idx] == test_list[0][idx] for ele in test_list): res.append(test_list[0][idx]) # printing resultprint("Extracted similar characters : " + str(res)) |
Output:
The original list is : [‘geeks’, ‘weak’, ‘beak’, ‘peek’]
Extracted similar characters : [‘e’, ‘k’]
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