UW CSE 190p Section 7/19, Summer 2012 Dun-Yu Hsiao.

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Presentation transcript:

UW CSE 190p Section 7/19, Summer 2012 Dun-Yu Hsiao

Homework/Quiz Questions?

Before We Start Create and remember save every code and steps you try today! If you have any question about today’s material, email your report to TA.

Outlines PDB recap Error messages Debugging exercise

PDB Recap Using PDB import pdb pdb.set_trace() Next, continue, quit, print, list, step in, return Careful about overwriting variables

Common Error Types AssertionError EOFError IndexError Raised when an assert statement fails. EOFError Raised when one of the built-in functions (input() or raw_input()) hits an end-of-file condition (EOF) without reading any data. IndexError Raised when a sequence subscript is out of range.

KeyError KeyboardInterrupt NameError Raised when a mapping (dictionary) key is not found in the set of existing keys. KeyboardInterrupt Raised when the user hits the interrupt key (normally Control-C or Delete). NameError Raised when a local or global name is not found.

SyntaxError IndentationError TypeError Raised when the parser encounters a syntax error. IndentationError Base class for syntax errors related to incorrect indentation. TypeError Raised when an operation or function is applied to an object of inappropriate type.

Unbound Local Error Go back and check variable names friends = friends(graph, fren) fof = fof | friends  friend = friends(graph, fren) fof = fof | friend

user=set(user)  user=set([user]) Assertion Error? Check output Print PDB How to correctly make the user as a set? user=set(user)  user=set([user])

Type Error? Print, type PDB Change indentation

More Errors fof = fof.remove(user) Keep user as a set Keep the remove method

Another Type Error friends = friends(rj, "Mercutio")

Questions?