Save multiple figures in one pdf page, matplotlib

You can use matplotlib gridspec to have multiple plots in 1 window

http://matplotlib.org/users/gridspec.html

from matplotlib.gridspec import GridSpec
import random
import numpy
from matplotlib import pyplot as pl

fig = pl.figure(figsize=(12, 16))
G = GridSpec(2,2)   
axes_1 = pl.subplot(G[0, :])

x = [random.gauss(3,1) for _ in range(400)]
bins = numpy.linspace(-10, 10, 100)
axes_1.hist(x, bins, alpha=0.5, label='x')

axes_2 = pl.subplot(G[1, :])
axes_2.plot(x)

pl.tight_layout()
pl.show()

You can change the rows and column values and can subdivide the sections.

The PDF backend makes one page per figure. Use subplots to get multiple plots into one figure and they'll all show up together on one page of the PDF.

Here is a solution provided by matplotlib:

from matplotlib.backends.backend_pdf import PdfPages
import matplotlib.pyplot as plt

with PdfPages('foo.pdf') as pdf:
    #As many times as you like, create a figure fig and save it:
    fig = plt.figure()
    pdf.savefig(fig)

    ....
    fig = plt.figure()
    pdf.savefig(fig) 

Voilà

Find a full example here: multipage pdf matplotlib

And by the way, for one figure, you don't need matplotlib.backends.backend_pdf just add pdf extension like so:

plt.savefig("foo.pdf")