To initialize all values to 0, just use a = [[0 for x in range(columns)] for y in range(rows)] . – ZX9. Sep 21 '16 at 15:33. Add a comment ... ... <看更多>

You can initialize a two dimensional array at the time of declaration. While declaring a two dimensional array ... ... <看更多>

First off don't use multiplication . It's creates 2 lists, not 7001. To better show this, hop into IDLE: >>> a = [[0] * 3] * 3 >>> a [[0, 0, ... ... <看更多>

Data manipulation in Python is nearly synonymous with NumPy array manipulation: even newer tools like Pandas (Chapter 3) are built around the NumPy array. ... <看更多>