graph.py

#!/bin/env python
from tkinter import *
from tkinter import filedialog

def displayGraph(canvas, vertices, edges):
    radius = 3
    for vertex, x, y in vertices:
        canvas.create_text(x - 2 * radius, y - 2 * radius, text = str(vertex), tags = "graph")
        canvas.create_oval(x - radius, y - radius, x + radius, y + radius, fill = "black", tags = "graph")

    for v1, v2 in edges:
        canvas.create_line(vertices[v1][1], vertices[v1][2], vertices[v2][1], vertices[v2][2], tags = "graph")

def main():

    infile = open(filedialog.askopenfilename(),'r')
    #infile = open("./file.txt",'r')

    numberOfVertices = int(infile.readline())
    print(numberOfVertices)

    vertices = []
    edges = []
    for i in range(numberOfVertices):
        items = infile.readline().strip().split()
        vertices.append([int(items[0]), int(items[1]), int(items[2])])
        for j in range(3, len(items)):
            edges.append([int(items[0]), int(items[j])])

    print(vertices)
    print(edges)

    infile.close()

    window = Tk()
    window.title("Display a Graph")

    frame1 = Frame(window)
    frame1.pack()
    canvas = Canvas(frame1, width = 300, height = 200)
    canvas.pack()

    displayGraph(canvas, vertices, edges)

    window.mainloop()

main()