How do I code a phase change slider for Python?

I am trying to code a sin wave with 5 sliders: frequency, amplitude, phase change, number of data points, and time. I am currently trying to link my phase change slider with my graph so that it updates it when I move the slider. I realise that my code is probably quite messy and could be more concise but I can adjust that later. I think I need to add some lines in the 'update section' although I can't quite think how to add the phase change slider like the frequency and amplitude sliders (which do work).

Any help with this issue or any other advice for my current code would be much appreciated!

My code so far:

import tkinter
import numpy as np
from scipy import signal
from scipy.fft import fft, ifft as sc
from matplotlib import pyplot as p, animation
# Implement the default Matplotlib key bindings.
from matplotlib.backend_bases import key_press_handler
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg, NavigationToolbar2Tk)
from matplotlib.figure import Figure
from matplotlib.widgets import Slider

root = tkinter.Tk()
root.wm_title("Embedding in Tk")
fig = Figure(figsize=(6, 5), dpi=100)
t = np.linspace(0, 5, 200)
f = 1
time = np.linspace(0, 100, 101)
y = np.sin(f*t)

fig.subplots_adjust(left=0.15, bottom=0.45)  # Adjust subplots region leaving room for the sliders 
and buttons

canvas = FigureCanvasTkAgg(fig, master=root)  # A tk.DrawingArea.
canvas.get_tk_widget().pack(side=tkinter.TOP, fill=tkinter.BOTH, expand=1)

toolbar = NavigationToolbar2Tk(canvas, root)
canvas.get_tk_widget().pack(side=tkinter.TOP, fill=tkinter.BOTH, expand=1)

def on_key_press(event):
    print("you pressed {}".format(event.key))
    key_press_handler(event, canvas, toolbar)

canvas.mpl_connect("key_press_event", on_key_press)

def _quit():
    root.quit()  # stops mainloop

button = tkinter.Button(master=root, text="Quit", command=_quit)

# Amplitude slider
initiala = 1  # starting value of amplitude on graph
asliderax = fig.add_axes([0.25, 0.15, 0.65, 0.03])  # setting amplitude slider position
aslider = Slider(asliderax, 'Amp', 0.1, 10.0, valinit=initiala)  # setting amplitude slider values

# Frequency slider
initialf = 1  # starting value of frequency on graph
fsliderax = fig.add_axes([0.25, 0.1, 0.65, 0.03])  # setting frequency slider position
fslider = Slider(fsliderax, 'Freq', 0.1, 3.0, valinit=initialf)  # setting frequency slider values

# Time slider
initialt = 1  # starting value of time on graph
tsliderax = fig.add_axes([0.25, 0.2, 0.65, 0.03])  # setting time slider position
tslider = Slider(tsliderax, 'Time', 0.1, 100.0, valinit=initialt)  # setting time slider values

# Number of Points slider
initialp = 99  # starting value of number of points on graph
psliderax = fig.add_axes([0.25, 0.25, 0.65, 0.03])  # setting points slider position
pslider = Slider(psliderax, 'Points', 3, 30.0, valinit=initialp)  # setting frequency points values

# Phase slider
initialph = 0  # starting value of number of points on graph
phsliderax = fig.add_axes([0.25, 0.3, 0.65, 0.03])  # setting points slider position
phslider = Slider(phsliderax, 'Phase Change', 0, np.pi*2, valinit=initialph)  # setting frequency 
points values

def update(val):
    amp = aslider.val
    freq = fslider.val
    t = np.linspace(0, 5, 200)



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