Code to produce the graph of daily newspapers in Trove at https://plot.ly/~wragge/20

gistfile1.py

import requests
import time
import plotly.plotly as py
from plotly.graph_objs import *

from credentials import TROVE_API_KEY

py.sign_in("[your plotly id]", "[your plotly password]")

titles_url = 'http://api.trove.nla.gov.au/newspaper/titles?encoding=json&key={}'
title_url = 'http://api.trove.nla.gov.au/newspaper/title/{}?encoding=json&key={}&include=years'

response = requests.get(titles_url.format(TROVE_API_KEY))
titles = response.json()

years = {}
x = []
y = []

for title in titles['response']['records']['newspaper']:
    title_id = title['id']
    response = requests.get(title_url.format(title_id, TROVE_API_KEY))
    details = response.json()
    for year in details['newspaper']['year']:
        date = int(year['date'])
        count = int(year['issuecount'])
        if count > 300:
            print 'Daily!'
            try:
                years[date] += 1
            except KeyError:
                years[date] = 1
    time.sleep(.5)

for year in sorted(years):
    if year < 1955:
        x.append(year)
        y.append(years[year])

trace1 = Scatter(
        x=x,
        y=y
    )

layout = Layout(
    xaxis=XAxis(
        title='Year'
    ),
    yaxis=YAxis(
        title='Number of daily newspapers in Trove'
    )
)

data = Data([trace1])
fig = Figure(data=data, layout=layout)
plot_url = py.plot(fig, filename='daily-papers')