user_rec_data_genertor.py

import uuid, random, json

# json.dumps(x, indent=4)

product_range = range(100000,110000)
num_recs_per_type = 20
num_users = 500000
user_ids = [ str(uuid.uuid1()) for _ in range(num_users) ]
rec_types = ['by_x','by_y','by_z']

user_recs = []

for _ in xrange(num_users):
	user_recs.append(
		{ "user_guid": str(uuid.uuid1()),
		"recommendations" : { r :random.sample(product_range, num_recs_per_type) for r in rec_types }})

with open('user-recs-' + str(num_users) + '-users.json', 'wb') as f:
	f.write(json.dumps(user_recs))