[Python] Play wav file in callback mode [Pyaudio / Python]

I wanna play wav file using PyAudio with callback mode. I could play wav file once but then stops. For example, if I want to play a wav file (trumpet sound, etc.) every five seconds, how should I implement this? Also, lemme know how to play array (wav data) in callback mode, just in case.

The code that I've implemented so far in the following...

import pyaudio
import numpy as np
import wave
import time

FORMAT = pyaudio.paInt16
CHANNEL = 2
CHUNK = 1024
RATE = 44100

flag = True
cur_dt = 0

# reading wav file here
wf = wave.open('test_3.wav', 'rb')

# instantiate PyAudio (1)
p = pyaudio.PyAudio()

# define callback (2)
def callback(in_data, frame_count, time_info, status):

global flag, cur_dt, wf

if flag:
wf = wave.open('test_3.wav', 'rb')
flag = False

data = np.zeros((frame_count,), dtype=np.int16)
data = wf.readframes(frame_count)

# convert bytes to int
data_int = np.frombuffer(data, dtype=np.int16)\

# convert int to float
data_float = data_int.astype(np.float32) / 32768.0

# # convert float to int
# data_int_again = (data_float*32768.0).astype(np.int16, order='C')

# ur processing...
f1 = np.fft.fft(data_float)
f2 = np.fft.ifft(f1)
f3 = (f2*32768.0).astype(np.int16)

# make it sound!
data = f3

# cur_dt += 1
# print(cur_dt)

return (data.tobytes(), pyaudio.paContinue)


# open stream using callback (3)
stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),
channels=wf.getnchannels(),
rate=wf.getframerate(),
output=True,
stream_callback=callback)

# print(p.get_format_from_width(wf.getsampwidth())) # paInt16
# print(wf.getsampwidth()) # 3
# print(wf.getnchannels()) # 2
# print(wf.getframerate()) # 44100

stream.start_stream()

# wait for stream to finish (5)
while stream.is_active():
time.sleep(5)
flag = True

# stop stream (6)
stream.stop_stream()
stream.close()
wf.close()

# close PyAudio (7)
p.terminate()

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