UNBC URL Code Computer Program Project

Hello,

i was creating a program to present number of each character out of a file the user browse for and present it on a text widget. The next phase was to have the same count presented as a histogram displayed on the text widget. I managed to find something smaller with a URL selection but i find it difficult to incorporate the same logic into my original code. Asking for help with using the same logic from the URL code into the original one so it could display the same as in the attached file.

the original code:

from tkinter import *

from tkinter import filedialog

from tkinter import messagebox

# Construct root window

root = Tk()

# Construct top frame

topframe = Frame(root)

topframe.pack(side=TOP)

# Add text area with scrollbar

scrollbar = Scrollbar(topframe)

text = Text(topframe, width=35, height=10, yscrollcommand=scrollbar.set)

scrollbar.config(command=text.yview)

scrollbar.pack(side=RIGHT, fill=Y)

text.pack(side=LEFT)

# Construct bottom frame

bottomframe = Frame(root)

bottomframe.pack(side=TOP)

# Add label to enter filename

var = StringVar()

label = Label(bottomframe, textvariable=var)

var.set(‘Enter filename:’)

label.pack(side=LEFT)

# Add entry for filename

entry = Entry(bottomframe, width=15)

entry.pack(side=LEFT)

# Callback function to get filename with file dialog

def getFilename():

filename = filedialog.askopenfilename(initialdir = ‘.’,

title = ‘Select a File’,

filetypes = ((‘Text files’,

‘*.txt*’),

(‘all files’,

‘*.*’)))

entry.delete(0, END)

entry.insert(0, filename)

# Add browse button to get filename

browseButton = Button(bottomframe, text=’Browse’, command=getFilename)

browseButton.pack(side=LEFT)

# Callback function to count characters from file

def countCharacters():

filename = entry.get()

alphabet = ‘abcdefghijklmnopqrstuvwxyz’

counts = {c: 0 for c in alphabet}

try:

with open(filename) as f:

for line in f:

for c in line:

if c in alphabet:

counts[c] += 1

text.delete(1.0, END)

for c in alphabet:

text.insert(END, c + ‘ appears ‘ + str(counts[c]) + ‘ times’)

if c != ‘z’:

text.insert(END, ‘n’)

except FileNotFoundError:

if filename == ”:

filename = ‘(empty)’

messagebox.showinfo(‘Error’, ‘Invalid filename: ‘ + filename)

# Add show result button to count characters

showResultButton = Button(bottomframe, text=’Show Result’, command=countCharacters)

showResultButton.pack(side=LEFT)

# Run main window

root.title(‘Occurrence of Letters’)

root.geometry(‘300×190’)

root.mainloop()

the histogram code and logic to be incorporated into the original code so this logic is preform on a text file selected by the user using browse:

from tkinter import *

import tkinter.messagebox
import urllib.request
import turtle
def main():
    counts = analyzeFile(url.get())
    drawHistogram(counts)

def analyzeFile(url):
    try:
        infile = urllib.request.urlopen(url)
        s = str(infile.read().decode()) # Read the content as string from the URL

        counts = countLetters(s.lower())

        infile.close() # Close file
    except ValueError:
        tkinter.messagebox.showwarning("Analyze URL",
            "URL " + url + " does not exist")

    return counts

def countLetters(s):
    counts = 26 * [0] # Create and initialize counts
    for ch in s:
        if ch.isalpha():
            counts[ord(ch) - ord('a')] += 1
    return counts

def drawHistogram(list):

    WIDTH = 400
    HEIGHT = 300

    raw_turtle.penup()
    raw_turtle.goto(-WIDTH / 2, -HEIGHT / 2)
    raw_turtle.pendown()
    raw_turtle.forward(WIDTH)

    widthOfBar = WIDTH / len(list)

    for i in range(len(list)):
        height = list[i] * HEIGHT / max(list)
        drawABar(-WIDTH / 2 + i * widthOfBar,
            -HEIGHT / 2, widthOfBar, height, letter_number=i)

    raw_turtle.hideturtle()

def drawABar(i, j, widthOfBar, height, letter_number):
    alf='abcdefghijklmnopqrstuvwxyz'
    raw_turtle.penup()
    raw_turtle.goto(i+2, j-20)

    #sign letter on histogram
    raw_turtle.write(alf[letter_number])
    raw_turtle.goto(i, j)

    raw_turtle.setheading(90)
    raw_turtle.pendown()
    raw_turtle.forward(height)
    raw_turtle.right(90)
    raw_turtle.forward(widthOfBar)
    raw_turtle.right(90)
    raw_turtle.forward(height)

window = Tk()
window.title("Occurrence of Letters in a Histogram from URL")

frame1 = Frame(window)
frame1.pack()

scrollbar = Scrollbar(frame1)
scrollbar.pack(side = RIGHT, fill = Y)

canvas = tkinter.Canvas(frame1, width=450, height=450)
raw_turtle = turtle.RawTurtle(canvas)

scrollbar.config(command = canvas.yview)
canvas.config( yscrollcommand=scrollbar.set)
canvas.pack()

frame2 = Frame(window)
frame2.pack()

Label(frame2, text = "Enter a URL: ").pack(side = LEFT)
url = StringVar()
Entry(frame2, width = 50, textvariable = url).pack(side = LEFT)
Button(frame2, text = "Show Result", command = main).pack(side = LEFT)

window.mainloop()