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Merge branch 'main' of https://github.com/holabayor/alx-low_level_programming into main

0x1C-makefiles/5-island_perimeter.py

@@ -0,0 +1,28 @@
+#!/usr/bin/python3
+"""island_ perimeter module."""
+
+
+def island_perimeter(grid):
+    """Function that calculates the perimeter of an island on a grid."""
+    i = 0
+    j = 0
+    perimeter = 0
+    if grid is None or type(grid) is not list or type(grid[0]) is not list:
+        return 0
+    length = len(grid)
+    length2 = len(grid[0])
+    while i < length:
+        while j < length2:
+            if grid[i][j] == 1:
+                if i == 0 or grid[i - 1][j] == 0:
+                    perimeter += 1
+                if j == 0 or grid[i][j - 1] == 0:
+                    perimeter += 1
+                if j == length2 - 1 or grid[i][j + 1] == 0:
+                    perimeter += 1
+                if i == length - 1 or grid[i + 1][j] == 0:
+                    perimeter += 1
+            j += 1
+        j = 0
+        i += 1
+    return perimeter