error: TypeError: coercing to Unicode: need string or buffer, float found

supposed to print the price if greater than the price + 0.2

public_client = gdax.PublicClient()
x = public_client.get_product_ticker(product_id='ETC-USD')
print x['bid']
time.sleep(20)
y = public_client.get_product_ticker(product_id='ETC-USD')
#if x['bid'] >= y['bid']:
if x['bid'] >= y['bid'] + (0.2):
        print x['bid']
else:
        print ('x isn't greater than y + 0.2')
        print  y['bid']