Posts Tagged ‘save as html’
Generating Charts with Python and matplotlib as Base64 images for embedding in HTML webpages
This is code used to create the charts for my ‘Compare Expense Ratios‘ microsite. It uses matplotlib to generate a chart which is converted to a Base64 to be embedded directly into a webpage. This way there is no need to save an intermediate image.
#Inputs are a dictionary of lists that contains points to plot (points), the title, and the x and y-axis labels.
def mathPlotLib(points, title, xlabel, ylabel):
import matplotlib
matplotlib.use('Agg')
from matplotlib import pyplot
import base64
import cStringIO
import natsort
#The two funds are the keys to the dicitonary
fundOrder = []
for fund in natsort.natsorted(points.keys()):
#Plot the points and keep track of the order they are added for the legend
pyplot.plot(points[fund])
fundOrder.append(fund)
# Add the legend, title, and x,y labels.
pyplot.legend(fundOrder)
pyplot.title(title)
pyplot.xlabel(xlabel)
pyplot.ylabel(ylabel)
# Convert the image as png as a byte-string object
my_stringIObytes = cStringIO.StringIO()
pyplot.savefig(my_stringIObytes, format='png')
# Seek to the beginning of the file and encode it as Base64
my_stringIObytes.seek(0)
b64png = base64.b64encode(my_stringIObytes.read())
# Add the html wrapper to embed it as base64
html = '<img src="image/png;base64,' + b64png + '" />'
# Clean up
my_stringIObytes.close()
pyplot.clf()
pyplot.close()
return html
Generate and save a static page in Django
Generate and save a static page in Django.
Where
html/static.html is a Django template
data is the data you want to pass into the page
static(request) is a function mapped to a url in urls.py
Then
Visiting the page will generate this static file
Code
from django.template.loader import render_to_string
def static(request):
results = render_to_string('html/static.html', {'content': html})
with open(r'C:tempstatic.html','w') as f:
f.write(results)
xyzio 