In Build Function

getName() and setName()

Every thread in python has name. It may be default name generated by python or customized name provided by programmer. We can get and set name of thread by using the following thread class methods.
- t.getName() ⇒ Returns name of thread.
- t.setName(newName) ⇒ Set our own name.

Note

getName() and setName() function give ‘DeprecationWarning’. In the place of this we recommend to use implicit variable ‘name’ and ‘set’ respectively.

Example

Python

from threading import *
print(current_thread().name)
current_thread().setName("Our own thread")
print(current_thread().name)
print(current_thread().name)

Output

PowerShell

MainThread
Our own thread
Our own thread

ident

For every thread internally a unique identification number is available. We can access this id by using implicit variable ‘ident’.

Example

Python

from threading import *
def test():
  print("Child Thread")
t=Thread(target=test)
t.start()
print("Main Thread Identification Number:",current_thread().ident)
print("Child Thread Identification Number:",t.ident)

Output

PowerShell

Child Thread
Main Thread Identification Number: 29836
Child Thread Identification Number: 15404

active_count()

This function returns the number of active threads currently running.

Example

Python

from threading import *
import time
def display():
  print(current_thread().name,"...started")
  time.sleep(3)
  print(current_thread().name,"...ended")
print("The Number of active Threads:",active_count())
t1=Thread(target=display,name="ChildThread1")
t2=Thread(target=display,name="ChildThread2")
t3=Thread(target=display,name="ChildThread3")
t1.start()
t2.start()
t3.start()
print("The Number of active Threads:",active_count())
time.sleep(5)
print("The Number of active Threads:",active_count())

Output

PowerShell

The Number of active Threads: 1
ChildThread2 ...started
ChildThread1 ...started
ChildThread3 ...started
The Number of active Threads: 4
ChildThread2 ...ended
ChildThread1 ...ended
ChildThread3 ...ended
The Number of active Threads: 1

enumerate()

This function returns a list of all active threads currently running.

Example

Python

from threading import *
import time
def display():
  print(current_thread().name,"...started")
  time.sleep(3)
  print(current_thread().name,"...ended")
t1=Thread(target=display,name="ChildThread1")
t2=Thread(target=display,name="ChildThread2")
t3=Thread(target=display,name="ChildThread3")
t1.start()
t2.start()
t3.start()
l=enumerate()
for t in l:
  print("Thread Name:",t.name)
time.sleep(5)
l=enumerate()
for t in l:
  print("Thread Name:",t.name)

Output

PowerShell

Thread Name: MainThread
Thread Name: ChildThread1
Thread Name: ChildThread2
Thread Name: ChildThread3
ChildThread2 ...started
ChildThread3 ...started
ChildThread1 ...started
ChildThread3 ...ended
ChildThread2 ...ended
ChildThread1 ...ended
Thread Name: MainThread

is_alive()

This method checks whether a thread is still executing or not.

Example

Python

from threading import *
import time
def display():
  print(current_thread().name,"...started")
  time.sleep(3)
  print(current_thread().name,"...ended")
t1=Thread(target=display,name="ChildThread1")
t2=Thread(target=display,name="ChildThread2")
t1.start()
t2.start()
print(t1.name,"is Alive :",t1.is_alive())
print(t2.name,"is Alive :",t2.is_alive())
time.sleep(5)
print(t1.name,"is Alive :",t1.is_alive())
print(t2.name,"is Alive :",t2.is_alive())

Output

PowerShell

ChildThread1 ...started
ChildThread2 ...started
ChildThread1 is Alive : True
ChildThread2 is Alive : True
ChildThread1 ...ended
ChildThread2 ...ended
ChildThread1 is Alive : False
ChildThread2 is Alive : False

join ()

If a thread wants to wait until completing some other thread then we should go for join() method.

Example

Python

from threading import *
import time
def display():
  for i in range(5):
    print("Seetha Thread")
    time.sleep(2)
t=Thread(target=display)
t.start()
t.join()
for i in range(5):
  print("Rama Thread")

Output

PowerShell

Seetha Thread
Seetha Thread
Seetha Thread
Seetha Thread
Seetha Thread
Rama Thread
Rama Thread
Rama Thread
Rama Thread
Rama Thread

join(seconds)

In this case thread will wait only specified amount of time.

Example

Python

from threading import *
import time
def display():
  for i in range(5):
    print("Seetha Thread")
    time.sleep(2)
t=Thread(target=display)
t.start()
t.join(5)
for i in range(5):
  print("Rama Thread")

Output

PowerShell

Seetha Thread
Seetha Thread
Seetha Thread
Rama Thread
Rama Thread
Rama Thread
Rama Thread
Rama Thread
Seetha Thread
Seetha Thread

Ungraded Questions

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