On Tuesday, April 23, 2013 7:41:27 PM UTC-4, animemaiden wrote:
> 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()
Also, it reads data from a file.
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