Reimport Something Python When Running Again

How to Loop Back to the Beginning of a Plan in Python?

Here, nosotros will see how to loop back to the beginning of the program in Python. In other words, the program'southward control is at some indicate other than the outset, and nosotros want the program to starting time from the acme over again. Consider the figure below to sympathize this concept.

Loop back in Python

In this mail service, we will talk about two approaches.

1. Using a Loop

Nosotros tin loop back to the start past using a control flow argument, i.e., a while statement. To do that, wrap the complete program in a while loop that is e'er Truthful.

Moreover, add a keep statement at a point where you want to start the programme from the showtime. You also demand to add some code such as a interruption argument to terminate your program.

Otherwise, the plan volition run infinitely, and we never desire that.

How to loop back in Python 2

Suppose we have a program that takes the distance and fourth dimension from the user and calculates the speed.

distance =  bladder(input("Enter the distance in kilometers: ")) fourth dimension = float(input("Enter the time in hours: ")) speed = distance/fourth dimension impress("Speed is:", speed,"kph")

Now, we want to kickoff from the beginning if the user wants to perform another calculation. To do that, we add together a while argument at the top.

We too use a continue statement to restart if the user enters yep. If the user wants to quit, the continue statement will not run, and the programme will cease. Consider the lawmaking below that implements this.

while Truthful:   distance =  float(input("Enter the altitude in kilometers: "))   time = float(input("Enter the time in hours: "))   speed = distance/fourth dimension   print("Speed is:", speed,"kph")   check = input("Do you lot want to quit or start again? enter Y to restart or another key to end: ")   if check.upper() == "Y": #go back to the top     continue       print("Good day...")   break #exit

Looping back in Python Output

2. Using a Function

Nosotros can also loop back to the offset by using a function. Instead of wrapping the whole code in a while loop, nosotros create a part and put our program there. If the user wants to keep, we volition phone call the procedure over again. Otherwise, we will go out the program.

Consider the same case implemented using a function.

def repeat(): 
  distance =  bladder(input("Enter the distance in kilometers: "))
   time = bladder(input("Enter the time in hours: "))
   speed = distance/time
     print("Speed is:", speed,"kph")
   check = input("Exercise you desire to quit or start proceeds, enter Y to restart or another to terminate ?: ") 
  if check.upper() == "Y": #loop back to the start 
  repeat()
  print("Bye...")
   go out() #exit the programme

  repeat()

Output

Looping back in Python result of function approach

Read about ways to loop back to the start of a program in Python.

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