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We also saw one simple example of NameError, which occurs when anything is not defined.

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We also saw how to try block works and with examples. In Python, there are different types of errors which we saw above, and we also saw which error or exception occurs and what are they.

This article concludes that an error that occurs during the program execution is handled using exception handling concepts in Python. In the above program, we can see that NameError occurs because a variable “x” is not defined, and if this error does not occur, it will show another message of the except block. Print('Program to demonstrate single try and many except block:') Now let us see how one try block with many except blocks example:

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Therefore we write the code that throws an error within the try block. In the above program, we can see we are trying to print variable “x” in a try block because we don’t know if an error might occur as we have not defined the variable “x” therefore, this error is handled by using except block where if this error occurs then except block identifies it as “NameError” and then we print a message saying the variable is not defined. Print('An exception occurred due to variable x is not defined') In the above program, we can see we are trying to print the variable “x”, which is not defined and hence it throws an error known as NameError, which is handled by the below code. Print('The demonstarton of exception handling in Python:') Now let us see the below example where an error occurs. Now let us see a simple example, where a variable is not defined, and we are handling NameError by using except clause and try statement. So an error occurs and is handled by except block, so only except block is executed only. Then this error occurs because we are trying to divide the number by zero. Now we will see another condition where exceptions occur, and we will see the above example only for the demonstration. But in this, when we call the function with proper numbers to divide, then no error occurs therefore, only try block is executed. So the code is written in a try block, and if we have the second number to divide the first number by zero, then an error occurs hence this exception is handled by except block. In the above program, we can see we are trying to divide two numbers. Print('Oops you are trying to divide by Zero:') Print('The result of the above expression is :', r) Print('The program where no exception and only try block is executed:')

Another special case is when an exception occurs, but the code within except clause couldn’t handle it, then it is passed to the outer try statement, and after all, still, the exception is unhandled, then the execution stops.Īs the above statements, we will demonstrate two cases below:īut, first, let us see when there are no exceptions, then we can run only try block. Whenever is there is no exception is occurred then only try block will run, and except clause is finished, and if exceptions occur, then the try clauses will be skipped and execute except clause. A try() block can have more than one except clause. Whenever we use try() and except() blocks first, try() block is executed, that is, the code between the try and except clause. ImportError: This type of error occurs when we have not imported the module that is needed, which means if the module is unable to find.Ĭode or statements How does try except() Block works with examples?.EOFError: This type of error occurs when the end of the file is reached without reading any data.ValueError: This type of error occurs when any built-in function receives the wrong argument.IOError: This occurs when the file cannot open.Let us see a few of exception errors that occur and are handled using try and except block: So we are seeing how to handle these exceptions using try and except block. The other type of error is known as an exception which occurs during the program execution.One is syntax error which occurs when the Python parser is unable to understand any line of codes.

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