One of the most common problems that every beginner faces while learning Python programming is the exit program. If you’re looking for python homework help or python homework solutions, you’ve come to the right place.
This blog will help you understand what an exit program is and how you can use the same in your code to make it quit when a user presses a particular key.
Let’s get started with our discussion on this topic:
What is Exit Program?
Python provides a built-in function to terminate the program called exit(). This function terminates the program and returns an exit status of 0 which tells that the program successfully terminated.
When you run a Python program, the interpreter starts reading your code from the first line and executes it line by line. This means that if you want to get the desired result from a program, you need to execute all lines of code in it. Now, there are some situations where you might want to end a program before it finishes executing. A basic example would be an input validation loop like this one:
You can use the quit() function to exit out of a program.
Add the following code inside your program and run it:
In Python, the exit() function is used to exit a program. The sys module has a inbuilt method exit() to terminate a program and come out of the execution.
How Does exit() Work?
In Python, when we use the exit() function, it will flush all the unwritten data and close all files. Then it will raise SystemExit exception to terminate the current program.
The syntax of an exit() is as follows:
Here, arg is optional and can be used to pass integer value which we want to return while exiting the program. If arg is omitted, then zero (0) is passed as an argument.
Now let’s see some examples of the exit() method.
You can exit from a Python script by using one of the following methods:
Method 1: exit()
This method is used to terminate the program and return a status. The syntax is as follows:
Parameter: status represents the status code returned by the program. It is an optional parameter.
Example: Following is an example to demonstrate the usage of exit() method with Python script. In this example, we are checking whether the value of x is less than 5 or not. If yes, then we are terminating the program. Otherwise, we are printing that value of x is greater than 5. In both cases, we are returning status 0 i.e., exiting with success.
class ProgramExit(Exception): pass def main(): try: x = int(input(‘Enter a number’)) if x < 5: print('x value greater than 5') raise ProgramExit else: print('x value less than or equal 5') return 0 except ProgramExit: print('x value less than or equal 5') return 1 except ValueError as e: print(e) except Exception as e: print(e) else:
There are many ways to exit a Python Program. But there are two different types of exits:
Conditional exits : When you want to exit the program based on some condition then you would use conditional exits
Unconditional exits : When you want to exit the program unconditionally, then you would use unconditional exits.