Python : Dealing with Errors

Python : Dealing with Errors

1. Here is some error types

   • TypeError : Raised when an unsupported operand type for 2 different DataType
   • NameError : Raised when a variable in not found in the local or global scope
   • IndexError : Raised when the index of a sequence is out of range.
   • OverflowError : Raised when the result of an arithmetic operation is too large to be represented.
   • ZeroDivisionError : Raised when 0 is defined as a divisor

2. Error Handling

   • 1__We can transform a code with Errors to a clean code that daesn't cause any Errors
     • 2__For that we should use the Try and Except keywords,
     • 3__In the "try" we defind the code, and in the "except" we define what the program should do if the code caused the Error definded in the Except block
   • Look at this explaining Example

3. User-Defined Error's

   • 1__In Python there is a way to creat our own Errors, that means that we tell the program that an action caused by a block of code is considered as an Error
   • 2__For that we should create a class whit the Error's name and the word "Exception" ......Class Error'sName(Exception): After that we write a message using the triple quotition marks..... like that: """the printing message""""
   • 3__We didn't finished yet. we should use the if statement .in this statement we're going to write : raise Error'sName. to raise the Error definded. Then we use the try and except block.
     • 4__Look at this Explaining Example

4. Use of Else and Finally blocks

   • Use of else: The else block is used to execute a code if there is no Error detected in the try block
   • Use of Finally : The finally block is used to execute a code whatever if a Error is catching or not,
   • Look at this explaining Example

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