Abrir texto de texto separado por Whitespaces Python

numbers = []

#Open the file
with open('file.txt') as fp:
    #Iterate through each line
    for line in fp:

        numbers.extend( #Append the list of numbers to the result array
            [int(item) #Convert each number to an integer
             for item in line.split() #Split each line of whitespace
             ])

print(numbers)
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