Grab some mapzen vector tiles!

TileGlob.py

import os
import urllib2

# This is a library of tile tools from Mapbox. Install with 'pip install mercantile'.
import mercantile

# Set the bounds of the area you want to download. (West, South, East, North)
bounds = (-105, 39.99, -104.99, 40)
zooms = [14]

# Set your tile api key.
api_key = "YOUR_TILE_API_KEY_HERE"

# Set your tile format.
tile_format = "topojson"

# Set the url template for tiles.
url_template = "https://vector.mapzen.com/osm/all/{z}/{x}/{y}" + ".{f}?api_key={k}".format(f=tile_format, k=api_key)

# Create a directory to store the tiles.
dirname = "tiles"
if not os.path.exists(dirname):
    os.makedirs(dirname)

for tile in list(mercantile.tiles(*bounds, zooms=zooms)):
    url = url_template.format(x=tile.x, y=tile.y, z=tile.z)
    print "Fetching tile: %s" % (url)
    data = urllib2.urlopen(url, timeout=10).readlines()
    filename = "{d}/{z}_{x}_{y}.{f}".format(d=dirname, x=tile.x, y=tile.y, z=tile.z, f=tile_format)
    print "Saving to: %s" % (filename)
    with open(filename, 'wb') as f:
        f.writelines(data)