api.py

#!/usr/bin/env python
import argparse
import requests
import pandas as pd
from datetime import datetime
import matplotlib.pyplot as plt

__version__ = '0.1'
__author__ =  'Norbert Bota'
__author_email__ = 'botanorbert1@gmail.com'

parser = argparse.ArgumentParser(
    description='Plotting a specific coin from coinmarketcap'
)

parser.add_argument(
    '-c', '--coin',
    action="store",
    help='specify coin name',
    required=True
)

coin_name = parser.parse_args()
COIN = coin_name.coin

BASE_URL = "https://graphs2.coinmarketcap.com/currencies/"

def historical_data(coin):
    r = requests.get("".join((BASE_URL, coin, "/")))
    coin_data = r.json()['price_usd']
    real_time = lambda x: datetime.fromtimestamp(x / 1e3)
    coin = {real_time(key): value for key, value in coin_data}
    return coin

def main():
    d = historical_data(COIN)
    df = pd.DataFrame(
        {
        "Time":list(d.keys()),
        "Price":list(d.values())
        },
        index=d.keys()
    )

    df['Price'].plot(figsize=(20,10), color="green")
    plt.title(COIN)
    plt.xlabel('Date')
    plt.ylabel('Price')
    plt.show()

if __name__=='__main__':
    main()