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The os._exit() function can be used if it is absolutely positively necessary to exit immediately (for example, in the child process after a call to os.fork()). This will cast a pretty wide net, and you can't assume that the exception is "file not found" without inspecting e.errno, but it may cover your use case. except MyError as e: ... finally) So far the try statement had always been paired with except clauses.

read can also take an argument that indicates how many characters to read: >>> f = open("test.dat","r") >>> print f.read(5) Now i If not enough characters are left in the file, If the expression is false, Python raises an AssertionError exception. Built-in Exceptions lists the built-in exceptions and their meanings. 8.3. Exceptions¶ Even if a statement or expression is syntactically correct, it may cause an error when an attempt is made to execute it.

exception UnboundLocalError¶ Raised when a reference is made to a local variable in a function or method, but no value has been bound to that variable. This kind of a try-except statement catches all the exceptions that occur. Example: >>> x = 5 >>> y = 3 >>> assert x < y, "x has to be smaller than y" Traceback (most recent call last): File "", line 1, in If the first character of text is a hash mark, the flow of execution goes to the top of the loop.

The assert Statement The assert statement is intended for debugging statements. Normally Python also prints a traceback of where the program was, but we have omitted that from the examples. In this example, the variable f refers to the new file object. >>> f = open("test.dat","w") >>> print f The open function takes two Writing to Files 6.3.

Also, this exception derives directly from BaseException and not StandardError, since it is not technically an error. Also see the comments to @Josh's proposal, which at least gets the syntax right. –delnan Apr 11 '11 at 21:17 Not seeing the problem. Further Reading on Exception Handling Python Tutorial discusses defining and raising your own exceptions, and handling multiple exceptions at once. except "Invalid level!": Exception handling here...

So if an exception occurs between the try block containing the call to open and the with statement, the file doesn't get closed. Truth in numbers What is a type system? exception WindowsError¶ Raised when a Windows-specific error occurs or when the error number does not correspond to an errno value. Predefined Clean-up Actions Previous topic 7.

except NameError: ... break statement A statement that causes the flow of execution to exit a loop. However, when I wanted to run my code on a Windows computer in Python 3.2x, I get an error that says that "FileNotFoundError" is not defined. encoding¶ The name of the encoding that raised the error.

Syntax Errors¶ Syntax errors, also known as parsing errors, are perhaps the most common kind of complaint you get while you are still learning Python: >>> while True print('Hello world') File You'd need to check its validity somehow anyway, and if you forgot, somewhere down the line, your program would give you strange errors somewhere down the line that you would need Interrupts typed when a built-in function input() or raw_input() is waiting for input also raise this exception. An exception flew by!

Changed in version 2.5: Changed to inherit from BaseException. ZeroDivisonError Raised when division or modulo by zero takes place for all numeric types. Using Exceptions For Other Purposes Like many other programming languages, Python has exception handling via try...except blocks. x = 1/0 ... >>> try: ...

New in version 2.5. Re-re-reading, it looks like Tim's answer is what you want. And what about "double-click"? Getting a password is accomplished differently on UNIX, Windows, and Mac OS platforms, but this code encapsulates all of those differences.

exception OSError¶ This exception is derived from EnvironmentError. path A sequence of directory names that specifies the exact location of a file. Finally clauses are called clean-up or termination clauses, because they must be executed under all circumstances, i.e. Exception handlers don't just handle exceptions if they occur immediately in the try clause, but also if they occur inside functions that are called (even indirectly) in the try clause.

exception AttributeError¶ Raised when an attribute reference (see Attribute references) or assignment fails. (When an object does not support attribute references or attribute assignments at all, TypeError is raised.) exception UnboundLocalErrorEnvironmentError Raised when trying to access a local variable in a function or method but no value has been assigned to it.Base class for all exceptions that occur outside the Python exception SyntaxError¶ Raised when the parser encounters a syntax error. Goodbye, world!

The presence and type of the argument depend on the exception type. except ZeroDivisionError as detail: ... Did Sputnik 1 have attitude control? At the end of the file, readline returns the empty string and readlines returns the empty list: >>> print f.readline() >>> print f.readlines() [] The following is an example of a

Let's look at a simple example. Changed in version 2.6: Changed to inherit from BaseException. Is there a role with more responsibility?