Python threading Module | active_count() Method with Example

Python threading.active_count() Method: Here, we are going to learn about the getName() method of threading Module in Python with its definition, syntax, and examples.
Submitted by Hritika Rajput, on May 14, 2020

Python threading.active_count() Method

active_count() is an inbuilt method of the threading module in Python. It is used to return the number of Thread objects that are active at any instant.

Module:

    import threading

Syntax:

    active_count()

Parameter(s):

  • None

Return value:

The return type of this method is <class 'int'>, it returns the number of active Thread class objects at any instant.

Example:

# Python program to explain the use of 
# active_count() method in Threading Module

import time
import threading

def thread_1(i):
    time.sleep(2)
    print("Number of active threads:", threading.active_count())
    print('Value by Thread 1:', i)

def thread_2(i):
    time.sleep(5)
    print("Number of active threads:", threading.active_count())
    print('Value by Thread 2:', i)
    
def thread_3(i):
    print("Number of active threads:", threading.active_count())
    print("Value by Thread 3:", i)
    
# Creating sample threads 
thread1 = threading.Thread(target=thread_1, args=(1,))
thread2 = threading.Thread(target=thread_2, args=(2,))
thread3 = threading.Thread(target=thread_3, args=(3,))

print("Number of active threads in the starting:", threading.active_count())
print("The active threads in the starting is 1 which is the main thread that executes till the program runs")

# Starting the threads
thread1.start()
thread2.start()
thread3.start()

Output

Number of active threads in the starting: 1
The active threads in the starting is 1 which is the main thread that executes till the program runs
Number of active threads: 4
Value by Thread 3: 3
Number of active threads: 3
Value by Thread 1: 1
Number of active threads: 2
Value by Thread 2: 2





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