import matplotlib.pyplot as plt 
from matplotlib.backends.backend_pdf import PdfPages
 
# short version
plt.plot(range(10))
plt.savefig('plot.pdf')
 
 
# long version
pdf = PdfPages('des_file_name.pdf')
 
plt.figure()
plt.hist(data)
plt.tight_layout()
 
print 'savefig...'
pdf.savefig()
plt.close()
pdf.close()