Python Multi Thread 파이썬 멀티 스레드

멀티 스레드를 사용해 보자.

 

import time
import threading
 
def Job(name, count, delay):
    print(f"{name} job started.")
    for i in range(count):
        print(f"{name} job: {i}.")
        time.sleep(delay)
    print(f"{name} job finished.")
 
print("Main started.")
 
thread_1 = threading.Thread(target=Job, args=("First", 5, 0.5))
thread_1.start()
 
thread_2 = threading.Thread(target=Job, args=("Second", 5, 0.5))
thread_2.start()
 
print(f"■ Number of threads: {threading.active_count()}")
 
time.sleep(1)
 
print("Main finished.")

 

 

■ threading.Thread(group=None, target=None, name=None, args=(), kwargs={}, *, daemon=None)

- target is the callable object to be invoked by the run() method. Defaults to None, meaning nothing is called.
- args is a list or tuple of arguments for the target invocation. Defaults to ().

 

 

import time
import threading
 
def Job(name, count, delay):
    print(f"{name} job started.")
    for i in range(count):
        print(f"{name} job: {i}.")
        time.sleep(delay)
    print(f"{name} job finished.")
 
print("Main started.")
 
thread_1 = threading.Thread(target=Job, args=("First", 5, 0.5))
thread_1.daemon = True
thread_1.start()
 
thread_2 = threading.Thread(target=Job, args=("Second", 5, 0.5))
thread_2.daemon = True
thread_2.start()
 
print(f"■ Number of threads: {threading.active_count()}")
 
time.sleep(1)
 
print("Main finished.")

 

 

 

import time
import threading
 
def Job(name, count, delay):
    print(f"{name} job started.")
    for i in range(count):
        print(f"{name} job: {i}.")
        time.sleep(delay)
    print(f"{name} job finished.")
 
print("Main started.")
 
thread_1 = threading.Thread(target=Job, args=("First", 5, 0.5))
thread_1.start()
thread_1.join()
 
thread_2 = threading.Thread(target=Job, args=("Second", 5, 0.5))
thread_2.start()
thread_2.join()
 
print(f"■ Number of threads: {threading.active_count()}")
 
time.sleep(1)
 
print("Main finished.")

 

 

■ join(timeout=None)

- Wait until the thread terminates. This blocks the calling thread until the thread whose join() method is called terminates – either normally or through an unhandled exception – or until the optional timeout occurs.
- When the timeout argument is present and not None, it should be a floating point number specifying a timeout for the operation in seconds (or fractions thereof). As join() always returns None, you must call is_alive() after join() to decide whether a timeout happened – if the thread is still alive, the join() call timed out.
- When the timeout argument is not present or None, the operation will block until the thread terminates.
- A thread can be joined many times.