Hi,
I'm trying to display a graph in Tkinter that reads a graph from a file and
displays it on a panel which the first line in the file contains a number that
indicates the number of vertices (n). The vertices are labeled as 0,1,…,n-1.
Each subsequent line, with the format u x y v1, v2, …describes that the vertex
u is located at position (x,y) with the edges (u,1). (u,v2), and so on.
I'm using Python 3.2.3 and I keep getting this error:
numberOfVertices = int(infile.readline().decode()) # Read the first line from
the file
AttributeError: 'str' object has no attribute 'readline'
Here is my code:
from tkinter import * # Import tkinter
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 = filedialog.askopenfilename()
numberOfVertices = int(infile.readline().decode()) # Read the first line
from the file
print(numberOfVertices)
vertices = []
edges = []
for i in range(numberOfVertices):
items = infile.readline().strip().split() # Read the info for one vertex
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() # Close the input file
window = Tk() # Create a window
window.title("Display a Graph") # Set title
frame1 = Frame(window) # Hold four labels for displaying cards
frame1.pack()
canvas = Canvas(frame1, width = 300, height = 200)
canvas.pack()
displayGraph(canvas, vertices, edges)
window.mainloop() # Create an event loop
main()
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