tkinter matplotlib numpy pandas line charts

# 8 organize your code
import matplotlib
matplotlib.use('TkAgg')
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure
import matplotlib.animation as animation
from matplotlib import style

import Tkinter as tk
import ttk

import urllib
import json

import pandas as pd
import numpy as np

LARGE_FONT = ('Vernada', 12)
style.use('ggplot')

f = Figure(figsize=(5, 5), dpi=100)
a = f.add_subplot(111)
##a.plot([1,2,3,4,5,6 ,7,8], [5,6,1,3,8,9,3,5])

def animate(i):
    pullData = open('sampleData.txt', 'r').read()
    dataList = pullData.split('
')
    xList = []
    yList = []
    for eachLine in dataList:
        if len(eachLine) > 1:
            x, y = eachLine.split(',')
            xList.append(int(x)) 
            yList.append(int(y))

    a.clear()
    a.plot(xList, yList)

     

class SeaofBTCapp(tk.Tk):

    def __init__(self, *args, **kwargs):

        tk.Tk.__init__(self)

        tk.Tk.iconbitmap(self, default="consumer.ico")
        tk.Tk.wm_title(self, "Sea of BTC client")
        
        container = tk.Frame(self)
        container.pack(side='top', fill='both', expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}
        for F in (StartPage, PageOne, PageTwo, PageThree):
            frame = F(container, self)

            self.frames[F] = frame

            frame.grid(row=0, column=0, sticky='nsew')

        self.show_frame(StartPage)

    def show_frame(self, cont):

        frame = self.frames[cont]
        frame.tkraise()


class StartPage(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        label = tk.Label(self, text='Start Page', font=LARGE_FONT)
        label.pack(padx=10, pady=10)

        button = ttk.Button(self, text="Visit Page 1",
                           command=lambda: controller.show_frame(PageOne))
        button.pack()
        button1 = tk.Button(self, text="Back to Page Two",
                           command=lambda: controller.show_frame(PageTwo))
        button1.pack()
        button2 = tk.Button(self, text="Graph Page",
                           command=lambda: controller.show_frame(PageThree))
        button2.pack()


class PageOne(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        label = tk.Label(self, text="Page One", font=LARGE_FONT)
        label.pack(padx=10, pady=10)

        button = tk.Button(self, text="Back to Start Page",
                           command=lambda: controller.show_frame(StartPage))
        button.pack()

        button1 = tk.Button(self, text="Back to Page Two",
                           command=lambda: controller.show_frame(PageTwo))
        button1.pack()

class PageTwo(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        label = tk.Label(self, text="Page Two!!!", font=LARGE_FONT)
        label.pack(padx=10, pady=10)

        button = tk.Button(self, text="Back to Start Page",
                           command=lambda: controller.show_frame(StartPage))
        button.pack()

        button1 = tk.Button(self, text="Back to Page One",
                           command=lambda: controller.show_frame(PageOne))
        button1.pack()

class PageThree(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        label = tk.Label(self, text="Graph Page!!!", font=LARGE_FONT)
        label.pack(padx=10, pady=10)

        button = tk.Button(self, text="Back to Start Page",
                           command=lambda: controller.show_frame(StartPage))
        button.pack()

        canvas = FigureCanvasTkAgg(f, self)
        canvas.show()
        canvas.get_tk_widget().pack(side='top', fill='both', expand=True)

        toolbar = NavigationToolbar2TkAgg(canvas, self)
        toolbar.update()
        canvas._tkcanvas.pack(side='top', fill='both', expand=True)

app = SeaofBTCapp()
ani = animation.FuncAnimation(f, animate, interval=1000)
app.mainloop()