Creating and Starting Threads

Basic Thread usage

basic_thread.py

import threading
 
 
def greet(name: str) -> None:
    print("Hello", name)
 
 
t = threading.Thread(target=greet, args=("Ravi",))
t.start()
t.join()
print("Main thread finished")

basic_thread.py

import threading
 
 
def greet(name: str) -> None:
    print("Hello", name)
 
 
t = threading.Thread(target=greet, args=("Ravi",))
t.start()
t.join()
print("Main thread finished")

Naming threads

Naming is helpful for logs.

thread_name.py

import threading
 
 
def work():
    print("Running in:", threading.current_thread().name)
 
 
t = threading.Thread(target=work, name="worker-1")
t.start()
t.join()

thread_name.py

import threading
 
 
def work():
    print("Running in:", threading.current_thread().name)
 
 
t = threading.Thread(target=work, name="worker-1")
t.start()
t.join()

Common mistakes

1) Forgetting join()

If you don’t join()join(), the main program may exit early in some cases.

Threads share memory. You need locks (next pages).

🧪 Try It Yourself

Exercise 1 – Create a Simple Thread

Exercise 2 – Join a Thread

Exercise 3 – Run Multiple Threads

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