给敏感字符串进行替换中间部分，从而达到脱敏的效果。代码如下：

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def HideMid(str1, count: int, fix='*'):
    """
       #隐藏/脱敏 中间几位
       str 字符串
       count 隐藏位数
       fix 替换符号
    """
    if not str1:
        return ''
    count = int(count)
    str_len = len(str1)
    ret_str = ''
    if str_len == 1:
        return str1
    elif str_len == 2:
        ret_str = str1[0] + '*'
    elif count == 1:
        mid_pos = int(str_len / 2)
        ret_str = str1[:mid_pos] + fix + str1[mid_pos + 1:]
    else:
        if str_len - 2 > count:
            if count % 2 == 0:
                if str_len % 2 == 0:
                    ret_str = str1[:int(str_len / 2 - count / 2)] + \
                        count * fix + str1[int(str_len / 2 + count / 2):]
                else:
                    ret_str = str1[:int((str_len + 1) / 2 - count / 2)] + count * fix + str1[int((
                        str_len + 1) / 2 + count / 2):]
            else:
                if str_len % 2 == 0:
                    ret_str = str1[:int(str_len / 2 - (count - 1) / 2)] + count * fix + str1[int(str_len / 2 + (
                        count + 1) / 2):]
                else:
                    ret_str = str1[:int((str_len + 1) / 2 - (count + 1) / 2)] + count * fix + str1[
                        int((str_len + 1) / 2 + (
                            count - 1) / 2):]
        else:
            ret_str = str1[0] + fix * (str_len - 2) + str1[-1]

    return ret_str