python 获取6大币对 区块高度

#!/usr/bin/python
# -*- coding: utf-8 -*-
import requests
from lxml import etree
import json

b_re = requests.get('https://chain.api.btc.com/v3/block/latest')
btc=b_re.json()['data']['height']

bch_re = requests.get('https://bch-chain.api.btc.com/v3/block/latest')
bch=bch_re.json()['data']['height']

ltc_re = requests.get('http://explorer.litecoin.net/')
selector1 = etree.HTML(ltc_re.text)
ltc = selector1.xpath('//td/a/text()')[1]

usdt = btc

etc_re = requests.get('http://gastracker.io/')
selector2 = etree.HTML(etc_re.text)
etc = selector2.xpath('//dl/dd/span/text()')[6]

eth_re = requests.get('https://etherscan.io/')
selector3 = etree.HTML(eth_re.text)
eth = selector3.xpath('//h4[@style="color: #FFFFFF"]//text()')[0]

print btc,bch,ltc,usdt
print eth,etc