Add Python 2D zero array example

src/Leetcode/freq-Python.md

@@ -76,4 +76,5 @@ from sortedcontainers import SortedSet
 - [f(x) if condition else g(x) for x in sequence]
 - [f(x) for x in sequence if condition]
 - [entry for tag in tags for entry in entries if tag in entry]
-- dp = [[[0 for _ in range(4)] for _ in range(3)] for _ in range(2)]
+- zeros = [[[0 for _ in range(4)] for _ in range(3)] for _ in range(2)]
+- zeros = [[0]*M for _ in range(N)]