[Python] Threading has no attribute Thread, no files named threading.py

I'm coding a simple client/server setup. The server seems to start fine, but when I try to connect the client I get a message saying "Threading has no attribute Thread." Then the server stops.

The only suggestion I've found doesn't work for me ... I have no files named threading.py, and the print(threading.__file__) statement shows the correct file path for the threading module.

I've left out functions that don't use the threading module for this example.

import socket
import threading
print(threading.__file__)

HEADER = 64
PORT = 5050
SERVER = socket.gethostbyname(socket.gethostname())
ADDR = (SERVER, PORT)
FORMAT = "utf-8"
DISCONNECT_MESSAGE = "!"

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind(ADDR)

...

def start():
# Listen for and accept connections
server.listen()
print(f"[LISTENING] Server is listening on {SERVER}")
while True:
conn, addr = server.accept()
t = threading.thread(target=handle_client, args=(conn, addr))
t.start()
print(f'[ACTIVE CONNECTIONS] {threading.activeCount() - 1}')

print('Server is starting ...')
start()

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