human
Solve in Python:
The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)

P   A   H   N
A P L S I I G
Y   I   R

And then read line by line: "PAHNAPLSIIGYIR"

Write the code that will take a string and make this conversion given a number of rows:

string convert(string s, int numRows);

Example 1:

Input: s = "PAYPALISHIRING", numRows = 3
Output: "PAHNAPLSIIGYIR"

Example 2:

Input: s = "PAYPALISHIRING", numRows = 4
Output: "PINALSIGYAHRPI"
Explanation:

P     I    N
A   L S  I G
Y A   H R
P     I

=====
Write me a the Python code you requested?
assistant
#Here is the Python code you requested.

class Solution:
     def convert(self, s, numRows):
         """
         :type s: str
         :type numRows: int
         :rtype: str
         """
         if numRows == 1:
             return s
         count = len(s)
         if count <= 1:
             return s
 
         result = []
         deltSmall = numRows - 1
         deltBig = 2 * deltSmall
         for i in range(0, numRows):
             k = i
             if i == 0 or i == deltSmall:
                 while k < count:
                     result.append(s[k])
                     k += deltBig
             else:
                 while k < count:
                     top = k - k % deltSmall
                     bottom = top + deltSmall
                     result.append(s[k])
                     nextk = 2 * bottom - k
                     if nextk < count:
                         result.append(s[nextk])
                     k += deltBig
 
         return "".join(result)