- guide: realPython
- reference from the official docs : reference
Py threads are daemons (detached threads) unless the main programm doesn't wait for their completion.
The main class thread:
import threadingJust create the callack and then define the object thread.
import threading
# the "thread function"
def quellochevuoi_threadfunction( ... your args ... ):
# really, everything you want inside it
pass
# define the thread
t = threading.Thread(
target = ...your thread function ... ,
args = ... a tuple of args ... ,
daemon = ... default True ... ,
)To run a thread use .start(), and .join() to wait it until end.
# start the thread
t.start( )
# wait the thread until it doesn't end
t.join( )see this example, and in particular take into account the function threading.append( ...Thread obj ... ).
The example just runs up to 4 threads giving to each of them a different integer index:
import threading
import time
def my_thread( index, name ):
print( "I'm thread no.", index, "; my name is ", name )
names = [ "arturo", "ermenegildo", "alfredo", "bernadette" ]
wait_time = 2
for i in range(1, 5):
# create the thread number 'i'
t = threading.Thread(
target = my_thread,
args = ( index, names[i] ),
daemon = True # detached thread, exit when the program ends
)
# append the thread
threading.append( t )
# start the thread
t.start( )
# wait until the end of the (universe) time
time.sleep( wait_time )just notice that .join( ) doesn't have a return value. If you want a return value the best way is to pass a reference to some memory location by argument.
For instance, an object passed by reference make this work.
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