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UW CSE 190p Section

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.

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UW CSE 190p Section

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

  2. Homework/Quiz Questions?

  3. 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.

  4. Outlines • PDB recap • Error messages • Debugging exercise

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

  6. Common Error Types • AssertionError • 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.

  7. KeyError • 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.

  8. SyntaxError • 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.

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

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

  11. Type Error? • Print, type • PDB • Change indentation

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

  13. Another Type Error • friends = friends(rj, "Mercutio")

  14. Questions?

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