Use curses, don't swear by Sean Zicari

Transcript

2. Use curses... don't swear an overview of terminal control in python
3. . Web Developer . Love all things low level . Love computer history whoami
4. . Web Developer . Love all things low level . Love computer history whoami
5. . Web Developer . Love all things low level . Love computer history whoami
6. . Cars.com . PyCon sponsor . Python/Postgres shop . Awesome place to work! where do I work
7. . Cars.com . PyCon sponsor . Python/Postgres shop . Awesome place to work! where do I work
8. . Cars.com . PyCon sponsor . Python/Postgres shop . Awesome place to work! where do I work
9. . Cars.com . PyCon sponsor . Python/Postgres shop . Awesome place to work! where do I work
10. video terminals!
11. . First VT ~1969 . Basic line/screen control . ASCII character set . ~300 baud (characters/second) video terminals!
12. . First VT ~1970 . Basic line control . ASCII character set . ~300 baud (characters/second) video terminals! VT-100
13. . Kernel handled data transfer . Terminal handled display (cursor, color, line handling...) . Terminal control through escape sequences talking to a terminal
14. . Vendor-specific escape sequences . ECMA-48 adopted in 1976 . termcap released in 1978 (TERMinal CAPability) standards? nope. Esc[20h Set new line mode LMN Esc[?1h Set cursor key to application DECCKM none Set ANSI (versus VT52) DECANM Esc[?3h Set number of columns to 132 DECCOLM Esc[?4h Set smooth scrolling DECSCLM Esc[?5h Set reverse video on screen DECSCNM Esc[?6h Set origin to relative DECOM Esc[?7h Set auto-wrap mode DECAWM Esc[?8h Set auto-repeat mode DECARM Esc[?9h Set interlacing mode DECINLM
15. . Vendor-specific escape sequences . ECMA-48 adopted in 1976 . termcap released in 1978 (TERMinal CAPability) standards? nope.
16. . Vendor-specific escape sequences . ECMA-48 adopted in 1976 . termcap released in 1978 (TERMinal CAPability) standards? nope.
17. line discipline
18. line discipline . Glue code . No execution context . line modes: "raw" or "cooked"
19. introducing (n)curses . Developed for BSD . Code borrowed from vi . Originally used termcap . Unix System III / V . Gained additional features . Curses became pcurses . pcurses became n(ew)curses
20. why (n)curses? . Plethora of terminals . Plethora of escape sequence variations . Portable . Convenient abstractions . Standardized API
21. (n)curses philosophy . Tools provided... . ...but you're on your own . One primary object: stdscr . Full cursor/screen control . Forms, windows, colors, cbreak mode . Manual Screen refresh
22. program dissection
23. program dissection
24. program dissection
25. program dissection
26. program dissection
27. program dissection
28. program dissection
29. program dissection
30. . Pronounced "oor'-wid" . Layered architecture . Display modules . Widget layout . Event loops introducing urwid
31. . Pronounced "oor'-wid" . Layered architecture . Display modules . Widget layout . Event loops introducing urwid
32. . Pronounced "oor'-wid" . Layered architecture . Display modules . Widget layout . Event loops introducing urwid
33. . Pronounced "oor'-wid" . Layered architecture . Display modules . Widget layout . Event loops introducing urwid
34. . Pronounced "oor'-wid" . Layered architecture . Display modules . Widget layout . Event loops introducing urwid
35. program dissection
36. resources Python Curses ------------- . Documentation http://docs.python.org/2/library/curses.html . Tutorial http://docs.python.org/2/howto/curses.html Urwid ----- . Documentation http://excess.org/urwid/docs/ . Tutorials http://excess.org/urwid/docs/tutorial/index.html#urwid-tutorial . Manual http://excess.org/urwid/docs/manual/index.html#urwid-manual