Make plt.show remember the last figure position and plot like last time.

ShowLastPos.py

import matplotlib
import matplotlib.pyplot as plt
from numpy import *
import pickle

def ShowLastPosSingleFig(plt):
    # Call plt.show but pickles the plot position on window close.  When called a second time
    # it loads the figure to the last position.  So matplotlib now remembers figure positions!
    # This version works for QT and WX backends.

    backend = matplotlib.get_backend()

    # WX backend
    if 'WX' in backend:
        mgr = plt.get_current_fig_manager()
        try:
            with open('CurrentWindowPos.pkl', 'r') as f:
                CurPos = pickle.load(f)
            mgr.window.SetPosition((CurPos[0], CurPos[1]))
            mgr.window.SetSize((CurPos[2], CurPos[3]))
        except:
            pass
        plt.show()
        p = mgr.window.GetPosition()
        s = mgr.window.GetSize()
        CurPos = (p[0], p[1], s[0], s[1])
        with open('CurrentWindowPos.pkl', 'w') as f:
            pickle.dump(CurPos, f)
    # QT backend.
    elif 'QT' in backend:
        mgr = plt.get_current_fig_manager()
        try:
            with open('CurrentWindowPos.pkl', 'r') as f:
                CurPos = pickle.load(f)
            mgr.window.setGeometry(CurPos[0], CurPos[1], CurPos[2], CurPos[3])
        except:
            pass
        plt.show()
        CurPos = mgr.window.geometry().getRect()
        with open('CurrentWindowPos.pkl', 'w') as f:
            pickle.dump(CurPos, f)
    else:
        print 'Backend ' + backend + ' not supported.  Plot figure position will not be sticky.'
        plt.show()


###########################################
#Version for dealing with multiple figures.
###########################################

def ShowLastPos(plt):
    # Call plt.show but pickles the plot position on window close.  When called a second time
    # it loads the figure to the last position.  So matplotlib now remembers figure positions!
    # This version works for QT and WX backends.

    backend = matplotlib.get_backend()

    FigNums = plt.get_fignums()

    for FigNum in FigNums:
        plt.figure(FigNum)
        fig=plt.gcf()
        fig.canvas.mpl_connect('close_event', RecordLastPos)
        mgr = plt.get_current_fig_manager()
        # WX backend
        if 'WX' in backend:
            try:
                with open('CurrentWindowPos%d.pkl'%FigNum, 'r') as f:
                    CurPos = pickle.load(f)
                mgr.window.SetPosition((CurPos[0], CurPos[1]))
                mgr.window.SetSize((CurPos[2], CurPos[3]))
            except:
                pass
        # QT backend.
        elif 'QT' in backend:
            try:
                with open('CurrentWindowPos%d.pkl'%FigNum, 'r') as f:
                    CurPos = pickle.load(f)
                mgr.window.setGeometry(CurPos[0], CurPos[1], CurPos[2], CurPos[3])
            except:
                pass
        else:
            print 'Backend ' + backend + ' not supported.  Plot figure position will not be sticky.'

    plt.show()

def RecordLastPos(evt):

    backend = matplotlib.get_backend()

    FigNums = plt.get_fignums()

    for FigNum in FigNums:
        plt.figure(FigNum)
        mgr = plt.get_current_fig_manager()
        # WX backend
        if 'WX' in backend:
            p = mgr.window.GetPosition()
            s = mgr.window.GetSize()
            CurPos = (p[0], p[1], s[0], s[1])
            with open('CurrentWindowPos%d.pkl'%FigNum, 'w') as f:
                pickle.dump(CurPos, f)
        # QT backend.
        elif 'QT' in backend:
            CurPos = mgr.window.geometry().getRect()
            with open('CurrentWindowPos%d.pkl'%FigNum, 'w') as f:
                pickle.dump(CurPos, f)
        else:
            pass