Given two lists of strings, where first list contains all elements of second list, the task is to replace every element in second list with index of elements in first list.
Method #1: Using Iteration
# Python code to replace every element # in second list with index of first element. # List Initialization Input1 = ['cut', 'god', 'pass'] Input2 = ['god', 'cut', 'cut', 'cut', 'god', 'pass', 'cut', 'pass'] # List Initialization Output = [] # Using iteration for x in Input2: for y in Input1: if x == y: Output.append(Input1.index(y)) # Printing output print("initial 2 list are") print(Input1, "\n", Input2) print("Second list after replacement is:", Output) |
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Output:
initial 2 list are ['cut', 'god', 'pass'] ['god', 'cut', 'cut', 'cut', 'god', 'pass', 'cut', 'pass'] Second list after replacement is: [1, 0, 0, 0, 1, 2, 0, 2]
Method #2: Using List comprehension
# Python code to replace every element # in second list with index of first element. # List initialization Input1 = ['cut', 'god', 'pass'] # using enumeate temp = {y:x for x, y in enumerate(Input1)} # List initialization Input2 = ['god', 'cut', 'cut', 'cut', 'god', 'pass', 'cut', 'pass'] # Using list comprehension Output = [temp.get(elem) for elem in Input2] # Printing output print("initial 2 list are") print(Input1, "\n", Input2) print("Second list after replacement is:", Output) |
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Output:
initial 2 list are ['cut', 'god', 'pass'] ['god', 'cut', 'cut', 'cut', 'god', 'pass', 'cut', 'pass'] Second list after replacement is: [1, 0, 0, 0, 1, 2, 0, 2]
Method #3 : Using map
# Python code to replace every element # in second list with index of first element. # List initialization Input1 = ['cut', 'god', 'pass'] # List initialization Input2 = ['god', 'cut', 'cut', 'cut', 'god', 'pass', 'cut', 'pass'] elem = {k: i for i, k in enumerate(Input1)} Output = list(map(elem.get, Input2)) # Printing output print("initial 2 list are") print(Input1, "\n", Input2) print("Second list after replacement is:", Output) |
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Output:
initial 2 list are ['cut', 'god', 'pass'] ['god', 'cut', 'cut', 'cut', 'god', 'pass', 'cut', 'pass'] Second list after replacement is: [1, 0, 0, 0, 1, 2, 0, 2]
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