How to call a function after some interval in Python
In this tutorial, we will learn how to call a function after some interval in Python. We will use threading.Timer(delay,fun) here.
The most common word while programming is “Function”.
A Function is a set of statements, written to perform specific operations.
Certainly, it would be clear with an example.
Sample Function :
def sample_function(number): # user defined function which adds +10 to given number return number+10 num = 45 add_num = sample_function(num) # calling a function print ("After adding 10 to",num,"the result is :",add_num)
Output : After adding 10 to 45 the result is: 55
It would be crystal clear about how a function works in Python.
Call a function after some interval in Python
Moreover, moving on to applying time delay to call a function, there are some key-points,
- A timer applies the desired delay.
- Python has timer objects that provide the facility to give arguments.
- The timer is basically a subclass of the Thread class.
- timer.start( ) starts the timer and schedules the task.
Steps to perform the time delay to call a function :
Don’t worry, that module is inbuilt and no extra code is necessary to import that.
This is the class that consists of a subclass called timer.
Now, writing user-defined function:
def fun(): # user defined function which adds +10 to given number print ("Hey u called me")
This function will get called after a certain delay in time.
Moreover, it is necessary to write the function definition above function call.
import threading def fun(): # user defined function which adds +10 to given number print ("Hey u called me") delay = int(input("Enter the delay time :")) start_time = threading.Timer(delay,fun) start_time.start() print ("End of the code")
Output : Enter the delay time : 5 End of the code Hey u called me
Certainly, to grasp the code above these points will help,
- delay = number of seconds after the function is called
- start_time is a timer object that has the arguments of delay_time and function itself.
- .start( ) starts the timer.
- Certainly, the output clearly determines that the code below gets executed first.
- Moreover, exactly after 5 seconds of delay, the function gets executed.
Syntax of threading.Timer : [ threading.Timer ( delay_time , function ) ]
Concluding, in programming the delays might be of use while Parallel Processing.