Method # 1: Using a loop
This is a crude method in which this task can be accomplished. In this we loop over the list of indices and concatenate the corresponding index characters from the string.
# Python3 code to demonstrate how it works # Get positional characters from a string # using a loop # initialization string test_str = " gfgisbest " # print the original line print ( " The original string is: " + test_str) # initializing the index list indx_list = [ 1 , 3 , 4 , 5 , 7 ] # Get positional characters from a string # using a loop res = ’’ for ele in indx_list: res = res + test_str [ele] # print result print ( "Substring of selective characters:" + res) |
Output:
The original string is: gfgisbest Substring of selective characters: fisbs
Method # 2: Using a generator expression + enumerate()
A combination of the above functions can be used to accomplish this task ... In this, we start a loop using a generator expression and retrieve the indices using enumerate ().
# Python3 code to demonstrate how it works # Get positional characters from string # using generator expression + enumerate () # initialization string test_str = "gfgisbest" # print the original line print ( "The original string is:" + test_str) # initializing the index list indx_list = [ 1 , 3 , 4 , 5 , 7 ] # Get positional characters from a string # using generator expression + enumerate () res = ’’ .join ((char for idx, char in enumerate (test_str) if idx in indx_list)) # print result print ( "Substring of selective characters:" + res) |
Exit:
The original string is: gfgisbest Substring of selective characters: fisbs
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