class Solution:
def convert(self, s, numRows):
"""
:type s: str
:type numRows: int
:rtype: str
"""
str_length = len(s)
node_length = 2*numRows - 2
result = ""
if str_length == 0 or numRows == 0 or numRows == 1:
return s
for i in range(numRows):
for j in range(i, str_length, node_length):
result += s[j]
if i != 0 and i != numRows-1 and j - 2*i + node_length < str_length:
result += s[j-2*i+node_length]
return result
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