![]() If an exception occurs and is caught by except, the action in the else clause is not executed. You can specify the action to be executed if there is no exception in the else clause. Execute action if no exception occurs: try. The try.except statement allows you to catch one or more exceptions in the try clause and handle each of. It is better to specify the expected exceptions as much as possible in the except clause because catching even an unexpected exception may cause a bug. Introduction to Python trycatchfinally statement. Built-in Exceptions - BaseException - Python 3.9.0 documentation.If you specify BaseException instead of Exception in the except clause, all exceptions will be caught, as well as wildcard except. The base class for all built-in exceptions, including SystemExit and KeyboardInterrupt, is BaseException. The exception inherits from BaseException so as to not be accidentally caught by code that catches Exception and thus prevent the interpreter from exiting.īuilt-in Exceptions - KeyboardInterrupt - Python 3.9.0 documentation This allows you to tell the program which operations to perform once the exception in the try block has been caught. A try statement includes: The keyword try A colon The code block that may cause an error Next, write the code you want to handle the exceptions in the except clause. In Python, you can use try-except statements to handle errors and exceptions that might happen when you run code. During execution, a check for interrupts is made regularly. To catch a Python exception, use a try statement. Raised when the user hits the interrupt key (normally Control-C or Delete). This allows the exception to properly propagate up and cause the interpreter to exit.īuilt-in Exceptions - SystemExit - Python 3.9.0 documentation ![]() It inherits from BaseException instead of Exception so that it is not accidentally caught by code that catches Exception. ![]() This exception is raised by the sys.exit() function. Since SystemExit and KeyboardInterrupt do not inherit Exception, specifying Exception in the except clause will not catch sys.exit() and the exception of interrupt key input.
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