plot_ticket_price.py

"""
Copyright (c) 2019, The Decred developers

This example script will pull ticket price data from dcrdata and plot using
matplotlib. The matplotlib package is not a decred dependency, so it should
be installed separately with `pip3 install matplotlib`.
"""

from decred.dcr.dcrdata import DcrdataClient
from decred.util.helpers import mktime


try:
    from matplotlib import pyplot as plt
except ImportError:
    print("matplotlib import error. Did you 'pip3 install matplotlib'?")
    exit()


def main():
    # Create a dcrdata client and grab the ticket price data.
    dcrdata = DcrdataClient("https://dcrdata.decred.org")
    ticketPrice = dcrdata.chart("ticket-price")
    # ticketPrice["t"] is UNIX timestamp (was "x")
    # ticketPrice["price"] is ticket price, in atoms (was "y")
    # These keys changed, see https://github.com/decred/dcrdata/pull/1507

    # Make the axes pretty.
    ax = plt.gca()  # gca = get current axes
    years = range(2016, 2026)
    ax.set_xticks([mktime(year) for year in years])
    ax.set_xticklabels([str(year) for year in years])
    ax.set_xlabel("date")
    ax.set_ylabel("ticket price (DCR)")

    ax.plot(
        ticketPrice["t"],
        [atoms * 1e-8 for atoms in ticketPrice["price"]],
        color="#222222",
    )
    plt.show()


if __name__ == "__main__":
    main()