Python | Combine two lists by maintaining duplicates in first list
Given two lists, the task is to combine two lists and removing duplicates, without removing duplicates in original list.
Example:
Input : list_1 = [11, 22, 22, 15] list_2 = [22, 15, 77, 9] Output : OutList = [11, 22, 22, 15, 77, 9]
Code #1: using extend
# Python code to combine two lists# and removing duplicates, without# removing duplicates in original list. # Initialisation of first listlist1 = [111, 222, 222, 115] # Initialisation of Second listlist2 = [222, 115, 77, 19] output = list(list1) # Using extend functionoutput.extend(y for y in list2 if y not in output) # printing resultprint(output) |
Output:
[111, 222, 222, 115, 77, 19]
Code #2 : Using Set and Iteration
Append those element in first list which are not in second list and then take union of first and second list.
# Python code to combine two lists # and removing duplicates, without # removing duplicates in original list. # Initialisation of first listlist1 = [11, 22, 22, 15] # Initialisation of Second listlist2 = [22, 15, 77, 9] # creating setunique_list1 = set(list1)unique_list2 = set(list2) # Difference in two setsdiff_element = unique_list2 - unique_list1 # union of difference + first listoutput = list1 + list(diff_element) # printing outputprint(output) |
Output:
[11, 22, 22, 15, 9, 77]
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