def convert(s, numRows):

    """

    :type s: str

    :type numRows: int

    :rtype: str

    """

    rel = ''     #创建记录结果的字符串

    strlist = [[0]*numRows]  #根据python习惯  我觉得创建一个竖起来的数组更好操作一点。

    count = 0

    row = 0

    col = 0       #标记当前填写的行列

    flag = 0    #标记这次填写是填竖着的还是填斜着的。

    if numRows == 1 :

        return s

    for i in s:

        if flag == 0:

            strlist[row][col] = i

            col += 1

            if col == numRows-1 :

                flag = 1

        elif flag == 1:

            strlist.append([0]*numRows)

            strlist[row][col] = i

            row += 1

            col -= 1

            if col == 0:

                flag = 0

    for col in range(numRows):

        for each in strlist:

            if each[col] != 0:

                rel += each[col]

    return (rel)