張園芯python自訂函數EXCEL PV和繪圖

def pv(r,n,m,f):#張園芯函數參數r,n,m,f
    p = m/r*(1 - 1/(1+r)**n)+f/(1+r)**n
    return p#執行函數的結果傳回去
n=float(input('期數: '))#要計算轉為實數real nubers
m=float(input('收付: '))#浮點點float
f=float(input('終值: '))
for i in range(1,10):#迴圈
   r = i*0.01
   x=pv(r,n,m,f)
   print('利率 ', r ,'價格 ', x)
import tkinter as tk#輸入tkinter繪圖
root = tk.Tk()
root.title('劉任昌python tkinter')
root.geometry('600x300')#寬度width改成600
canvas = tk.Canvas(root, width=600, height=600)  # 加入 Canvas 畫布
canvas.pack()
x, y = 0, 0
canvas.create_line(0, 400, 500, 400, width=3,fill='black')
canvas.create_line(5, 0, 5, 400, width=3,fill='black')
for x in range(1, 400):
    x1 = x+1
    y1 = 400 - pv(x1,n,m,f)*400
    canvas.create_line(x, y, x1, y1, width=5,fill='blue')
    canvas.pack()
    x = x1
    y = y1
root.mainloop()

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