title: How to plot contourf and my graph in the same figure
body: <p>I have a figure showing the contourf plot and another showing a plot i've made earlier and I want to plot both on the same figure what should I do?
  Here is the code of my contourf plot:</p>
  
  <pre><code>import pylab as pl
  from pylab import *
  import xlrd
  import math
  import itertools
  from matplotlib import collections as mc
  import matplotlib.pyplot as plt
  import copy as dc
  import pyexcel
  from pyexcel.ext import xlsx
  import decimal
  
  x_list = linspace(0, 99, 100)
  y_list = linspace(0, 99, 100)
  X, Y = meshgrid(x_list, y_list, indexing='xy')
  
  Z = [[0 for x in range(len(x_list))] for x in range(len(y_list))]
  for each_axes in range(len(Z)):
      for each_point in range(len(Z[each_axes])):
          Z[len(Z)-1-each_axes][each_point] = power_at_each_point(each_point, each_axes)
  
  figure()
  CP2 = contourf(X, Y, Z, cmap=plt.get_cmap('Reds'))
  colorbar(CP2)
  title('Coverage Plot')
  xlabel('x (m)')
  ylabel('y (m)')
  show()
  </code></pre>
  
  <p>This is the code of my previously plotted plot:</p>
  
  <pre><code>lc = mc.LineCollection(lines, linewidths=3)
  fig, ax = pl.subplots()
  ax.add_collection(lc)
  ax.autoscale()
  ax.margins(0.05)
  
  #The code blow is just for drawing the final plot of the building.
  Nodes = xlrd.open_workbook(Node_file_location)
  sheet = Nodes.sheet_by_index(0)
  Node_Order_Counter = range(1, sheet.nrows + 1)
  In_Node_Order_Counter = 0
  for counter in range(len(Node_Positions_Ascending)):
      plt.plot(Node_Positions_Ascending[counter][0],     Node_Positions_Ascending[counter][1], marker='o', color='r',
               markersize=6)
      pl.text(Node_Positions_Ascending[counter][0],     Node_Positions_Ascending[counter][1],
              str(Node_Order_Counter[In_Node_Order_Counter]),
              color="black", fontsize=15)
      In_Node_Order_Counter += 1
  #Plotting the different node positions on our plot &amp; numbering them
  pl.show()
  </code></pre>