统计英文词频，运行代码出现 >>> 输入文章.txt 报错

Question

import turtle

count=5
data=[]
words=[]
yScale=6
xScale=30
#从点（x1,y1)到（x2,y2）绘制线段

def drawLine(t,x1,y1,x2,y2):
    t.penup()
    t.goto(x1,y1)
    t.pendown()
    t.goto(x2,y2)
#在坐标（x,y）处写文字

def drawText(t,x,y,text):
    t.penup()
    t.goto(x,y)
    t.pendown()
    t.write(text)

def drawGraph(t):
    drawLine(t,0,0,360,0)
    drawLine(t,0,300,0,0)

    for x in range(count):
        x+=1
        drawText(t,x*xScale-4,-20,(words[x-1]))
        drwaText(t,x*xScale-4,data[x-1]*yScale+10,data[x-1])
    drawBar(t)

def drawRectangle(t,x,y):
    x=x*xScale
    y=y*yScale
    drawLine(t,x-5,0,x-5,y)
    drawLine(t,x-5,0,x+5,y)
    drawLine(t,x+5,0,x+5,y)
    drawLine(t,x+5,0,x-5,y)

def drawBar(t):
    for i in range(count):
        drawRectangle(t,i+1,data[i])
       

def replacePunctuation(line):
    for ch in line:
        if ch in "~@#$%^&*((_+<>?:',.\[]{}|":
            line=line.replace(ch,"")
    return line
   
def processLine(line,wordCounts):
    line=replacePunctuations(line)
    words=line.split()
    for word in words:
        if word in wordCounts:
            wordCount[word]+=1
        else:
            wordCounts[word]=1

def main():
    filename=input("enter a filename:").strip()
    infile=open(filename,"r")

    wordCounts={}
    for line in infile:
        processLine(line.lower(),wordCounts)

    pairs=list(wordCounts.items())
    items=[[x,y]for(y,x)in pairs]
    items.sort()

    for i in range(len(items)-1,len(items)-count-1,-1):
        print(items[i][1]+"\t"+str(items[i][0]))
        data.append(items[i][0])
        words.append(items[i][1])

    turtle.setup(900,750,0,0)
    t=turtle.Turtle()
    t.hideturtle()
    t.width(3)
    drawGraph(t)

    if __name__=='__main__':
        main()