Started working on 82

problem82.py

+#!/usr/bin/env python
+from copy import deepcopy
+
+m = [map(int, line.split(',')) for line in open('matrix.txt', 'r').readlines()]
+h, w = len(m), len(m[0])
+orig = deepcopy(m)
+
+def trypath(paths, *indices):
+    try:
+        paths.append(sum(orig[y][x] for x, y in indices))
+    except IndexError:
+        pass
+
+for c in xrange(1, w):
+    for r in xrange(h):
+        paths = []
+        trypath(paths, (c - 1, r - 1), (c, r - 1))
+        trypath(paths, (c - 1, r))
+        trypath(paths, (c - 1, r + 1), (c, r + 1))
+        m[r][c] += min(paths)
+
+print min(row[-1] for row in m)