问Python - expandtabs（）方法背后的想法

EN

def expandtabs(string, n):
    result = ""
    pos = 0
    for char in string:
        if char == "\t":
            # instead of the tab character, append the
            # number of spaces to the next tab stop
            char = " " * (n - pos % n)
        if char == "\n":
            pos = 0
        else:
            pos += len(char)
        result += char
    return result

    input = "123\t12345\t1234\t1\n12\t1234\t123\t1"
    print(expandtabs(input, 10))