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Hey guys, this chapter covers the concept of exceptional handling
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So what does it really mean? Well, the exceptional handling is the process of handling any type of errors that might
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arise during program execution. So we as programmers have to handle them and when some statement has the possibility to
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arise an error, we simply display a message to the user or perform any other activity
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before even the error hits so the end user has not to worry about any errors during the
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runtime of a program. Before we dive into program examples, we need to understand some important keywords
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We mainly use four keywords associated with exceptional handling. Try The try keyword is what lets you to test a
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block of code for errors. Exception The exception keyword helps you handle the error
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Else The else block will be considered when there are no errors
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Finally The finally block contains a statement or group of statements that has to be executed regardless of the result of the try and exceptional blocks
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Example 1 A program that divides two given numbers num1 equals to 5 num2 equals to 0
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try print num1 divided by num2 except print the denominator should not be 0
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Example 2 In this example, the except block doesn't execute. Try print hello except print something went wrong
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else print nothing went wrong Example 3 So now we're trying to open a text file
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Try f equals to open testing.txt except print the file not exists
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else f.write hello world print done Finally, f.close print finally closed
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Try practicing exceptional handling yourself so you can get better in handling any type
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of errors. That was all. Thanks for watching
