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Example 6: Write a Python code to calculate simple interest and amount payable by inputting
the value of principal amount and rate from the user for a time period of 5 years.
(Formula used: Simple Interest = Principal * Rate * Time/100)

3.15 DEBUGGING

Apart from computer programs that we code, an exception or error or unusual condition can
occur even in our daily life. Consider a real-life scenario—you leave your house for office
by driving a car. On the way, the tyre gets punctured and you are forced to stop the car and
replace the tyre. So, in this scenario, the punctured tyre is the exception which has occurred
Supplement – Informatics Practices with Python–XI
unexpectedly. In such situations, we are required to carry along a spare tyre so that we can
change the punctured tyre then and there only and can continue with our journey, which is
described as exception handling.

Normal Flow Exception Exception Handling

Likewise, when we are browsing a webpage and that webpage is unreachable because there is
no network connection or that there is no microphone available to create an audio recording—
these are examples of exceptions or errors.

Sometimes an application can recover from an error and still provide normal, expected
behaviour, sometimes errors get reported to the user, sometimes they get logged to a file, etc.
It depends on the specific error and the application. Same is applicable in the field of computer
programming also.

Most application codes written for developing applications have errors in them. When your
application suddenly freezes for no apparent reason, that is usually because of an error. But
we all understand that programs have to deal with errors.

3.4