Question

我目前正在开始编程课程，需要帮助纠正功能。我需要此列表中的所有元素都是整数而不是字符串。要做到这一点，我需要从函数中更改一行，但我不知道要更改哪一行！任何帮助将不胜感激。

def read_magic_square(filename):
    """
    Read values from a file into a 2D list

    Parameter:
    filename: the name of the file

    Returns a 2D list of integer values read.
    """

    infile = open(filename, "rt")
    square = []  # start with an empty list

    for line in infile:  # read text from file
        row = []
        numbers = line.split()

        # Loop through the list of numbers.
        # Append each number to the row.
        for num in numbers:
            row.append(num)

        if len(row) > 0:  # Don't count blank lines
            square.append(row)  # Append the row to the 2D list

    return square

Answer 1

为避免错误，如果行中有字符串，则只能将附加行更改为（您可以将invalid_replacement更改为您想要的任何内容，此处我将其设置为零）< / EM>：

invalid_replacement = 0 try: row.append(int(num)) except: row.append(invalid_replacement)

需要列表的所有元素都是整数

1 个答案: