z字行变换作业

z_convert.py

+class solution:
+    # step = 1
+    def convert(self, s, numrow):
+        if numrow == 1:
+            return s
+        L=['']*numrow
+        step = 1
+        index = 0
+        if numrow >=1:
+            for x in s:                     # for循环后面有冒号：
+                L[index] = L[index] + x
+                if index == 0:
+                    step = 1
+                elif index == numrow-1:
+                    step = -1
+                index += step
+            return ''.join(L)
+sol = solution()
+s = "LEETCODEISHIRING"
+numrow = 4
+sol.convert(s, numrow)
+print(sol.convert(s, numrow))
+
+
+