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Terminating a Python script
I have a simple Python script that I want to stop executing if a condition is met.
- How do I abort the execution of a Python script? The body of a function which allows the flow of the code to exit the function and not execute the remaining code.
- Flow of Execution Summary¶. When you are working with functions it is really important to know the order in which statements are executed. This is called the flow of execution or control flow and we’ve already talked about it a number of times so far. To recap:. Execution always begins at the first statement of the program.
For example:
Essentially, I am looking for something that behaves equivalently to the 'return' keyword in the body of a function which allows the flow of the code to exit the function and not execute the remaining code.
A program’s control flow is the order in which the program’s code executes. The control flow of a Python program is regulated by conditional statements, loops, and function calls. This section covers the if statement and for and while loops; functions are covered later in this chapter. In Python flow is sequential as long as successive statements are indented the same amount. The for statement introduces indented sub-statements after the for-loop heading. Flow of control is often easy to visualize and understand if we draw a flowchart. This flowchart shows the exact steps and logic of how the for statement executes. I'm completely new to Python and thus a bit confused about the flow of a program in Python. If my understanding is correct, for a single.py file, if we add the line if name 'main': main.
Ray VegaRay Vegamarked as duplicate by Mark Byers, Michael Mrozek, danben, gnovice, sthAug 1 '10 at 18:04
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8 Answers
To exit a script you can use,
You can also provide an exit status value, usually an integer.
Exits with zero, which is generally interpreted as success. Non-zero codes are usually treated as errors. The default is to exit with zero.
Prints 'aa! errors!' and exits with a status code of 1.
There is also an _exit() function in the os module. The sys.exit() function raises a SystemExit exception to exit the program, so try statements and cleanup code can execute. The os._exit() version doesn't do this. It just ends the program without doing any cleanup or flushing output buffers, so it shouldn't normally be used.
The Python docs indicate that os._exit() is the normal way to end a child process created with a call to os.fork(), so it does have a use in certain circumstances.
Matthew StrawbridgeYou could put the body of your script into a function and then you could return from that function.
David LockeDavid LockeYou can either use:
or:
The optional parameter can be an exit code or an error message. Both methods are identical. I used to prefer sys.exit, but I've lately switched to raising SystemExit, because it seems to stand out better among the rest of the code (due to the raise keyword).
efotinisefotinisTry
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if this is what you are looking for. It terminates the execution of the script even it is called from an imported module / def /function
GabrieleVGabrieleVIf the entire program should stop use sys.exit() otherwise just use an empty return.
AndréAndré