COMP10001 Lecture Notes - Lecture 7: Stack Trace, Call Stack, Exception Handling

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25 May 2018

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dir() lists the current namespace

Namespaces:

facilitates function nesting

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allows functions to communicate with one another

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preserve a function's local state/namespace

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functions are stored on the "call stack"

stack trace in error message can gives hints on the cause of a bug

Tracing functions:

python prints the exception causing the error

IndexError = raised when an index is out of range

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KeyError = raised when a key is not found in a dictionary

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common exceptions are

handle exceptions by using "try: … except …"

e.g. assert type(balance) == int

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use sparingly (use an explicit if statement if the result is important)

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assertions ensure that inputs are of the right type

Exception handling:

Week 7

Monday, 23 April 2018 10:05 PM

Foundations of Computing Page 1

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