Error Handling

Common Types of Error:

SyntaxError

NameError

TypeError

IndexError

Attribute Error

Good Debugging techniques:

• using print option

• using python built in debugger (pdb)

• using differeing IDE debugging tools

Exception Handling:

• try…except

  • try — used on block of code that may raise an excpetion

  • exceptions takes a specific exception (XXXXErrror, etc) and runs this specific block

    • can use multiple exceptions

• else and finally

  • can extend try and except blocks

  • finally → will always run regardless of error

• exception object

  • ex except ValueError as e:

    • lets you access exception for better debung and print direcr error messages

    • use as keyword to access

• raise statement

  • throw an exception when a certain condition is met.

  • manually raise an exception

  • ex
        def divide(a, b): if b == 0: raise ZeroDivisionError('You cannot divide by zero') return a / b

Exception Signaling:

• can be used to create custom error excepiron

• can also be used with the from keyword

  • chain exceprions