The Code

import urllib.request
import json

def getCoins():
        coin = open("coins.txt", "r").read()
        coins = coin.split("\n")
        for c in coins:
                if(c != ""):
                  print(c + ": " + getRate(c))


def getRate(coin):
        r = urllib.request.urlopen("https://api.coinmarketcap.com/v1/ticker/" + coin)
        d = json.load(r)
        data = d[0]
        return(data['price_usd'])

getCoins()

Explaining the above a little more

import urllib.request
import json

So this is just importing stuff that will be needed for the rest of the program
just note that urllib.request is specific to python3, so this probably will not work so
well with python2.

def getCoins():
        coin = open("coins.txt", "r").read()
        coins = coin.split("\n")
        for c in coins:
                if(c != ""):
                  print(c + ": " + getRate(c))

Okay here we have a block that reads a file on disk for names on coins, it has to be formed as
the name is formed in the url on coinmarketcap, so if you want to know about harvest, you have to write
harvest-masternode-coin in the config file/coins.txt file.
the if statement is needed since the split leaves a blank string in the list, so this just weeds that out.

def getRate(coin):
        r = urllib.request.urlopen("https://api.coinmarketcap.com/v1/ticker/" + coin)
        d = json.load(r)
        data = d[0]
        return(data['price_usd'])

This one is the piece of the code that does the most important part
namely the fetching from coinmarketcap.com, and then display the useful information.