main.py

from Tkinter import *
import math

def draw_sin(a1, a2):
    c.delete("all")
    center = height//2
    x_start = a1
    x_max = width
    x_increment = 1
    x_factor = (a2 - a1) / 400
    y_amplitude = 80
    center_line = c.create_line(0, center, width, center, fill='green')
    xy1 = []
    for x in range(400):
        xy1.append(x_start + x * x_increment)
        xy1.append(int(math.sin(x_start + x * x_factor) * y_amplitude) + center)
    sin_line = c.create_line(xy1, fill='blue')

def entry_changed(*args):
    draw_sin(a1.get(), a2.get())

root = Tk()
root.title("Simple plot using canvas and line")

a1 = DoubleVar()
a1.set(0)
a1.trace("w", entry_changed)
textl = Entry(root, textvariable=a1)
textl.pack()

a2 = DoubleVar()
a2.set(2 * math.pi)
a2.trace("w", entry_changed)
textr = Entry(root, textvariable=a2)
textr.pack()

width = 400
height = 300

c = Canvas(width=width, height=height, bg='white')
c.pack()

str1 = "sin(x)=blue"
c.create_text(10, 20, anchor=SW, text=str1)

entry_changed()

root.mainloop()