(6) errors and exceptions

Syntactic errors and exceptions

Handle T (RuntimeError, TypeError, NameError)

Try... then t has an optional else clause.

Exception parameter exceplt NameError x:

Raise NameError, 'Hi there'; raise my_exec, 2*2 custom exceptions.

Finally:

Cannot have distinct T and finally clauses at the same time. nested clauses can be used if necessary.

There are three main types of program errors: syntax errors refer to violation of syntax rules; Semantic Errors refer to logical errors and method errors to solve the problem; running errors refer to data exceptions during running, division by zero or the file does not exist.