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Avatar for Philip James Philip James
October 11, 2015
Technology
150
0

Type Python, Press Enter, What Happens? - PyDX 2015

The slides from my talk at PyDX

Avatar for Philip James

Philip James

October 11, 2015

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Transcript

  1. Type Python, Press Enter, What Happens? Philip James (@phildini) PyDX

    2015

  2. Who am I? @phildini #typepython

  3. paulproteus@vellum:~ $ @phildini #typepython

  4. paulproteus@vellum:~ $ python @phildini #typepython

  5. paulproteus@vellum:~ $ python Python 2.7.6 (default, Apr 11 2014, 22:59:56)

    [GCC 4.8.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> @phildini #typepython

  6. paulproteus@vellum:~ $ python Python 2.7.6 (default, Apr 11 2014, 22:59:56)

    [GCC 4.8.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> @phildini #typepython 2+2

  7. paulproteus@vellum:~ $ python Python 2.7.6 (default, Apr 11 2014, 22:59:56)

    [GCC 4.8.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> @phildini #typepython 2+2 4 >>>

  8. paulproteus@vellum:~ $ python Python 2.7.6 (default, Apr 11 2014, 22:59:56)

    [GCC 4.8.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> @phildini #typepython 2+2 4 >>> KeyboardInterrupt >>>

  9. paulproteus@vellum:~ $ python Python 2.7.6 (default, Apr 11 2014, 22:59:56)

    [GCC 4.8.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> @phildini #typepython 2+2 4 >>> KeyboardInterrupt >>> paulproteus@vellum:~ $

  10. paulproteus@vellum:~ $ @phildini #typepython

  11. paulproteus@vellum:~ $ python @phildini #typepython

  12. paulproteus@vellum:~ $ @phildini #typepython

  13. paulproteus@vellum:~ $ echo $PATH @phildini #typepython

  14. paulproteus@vellum:~ $ echo $PATH /home/paulproteus/bin:/usr/bin:/usr/local/bin: @phildini #typepython

  15. paulproteus@vellum:~ $ echo $PATH /home/paulproteus/bin:/usr/bin:/usr/local/bin: paulproteus@vellum:~ $ @phildini #typepython

  16. paulproteus@vellum:~ $ echo $PATH /home/paulproteus/bin:/usr/bin:/usr/local/bin: paulproteus@vellum:~ $ python @phildini #typepython

  17. paulproteus@vellum:~ $ echo $PATH /home/paulproteus/bin:/usr/bin:/usr/local/bin: paulproteus@vellum:~ $ python @phildini #typepython

  18. paulproteus@vellum:~ $ echo $PATH /home/paulproteus/bin:/usr/bin:/usr/local/bin: paulproteus@vellum:~ $ python @phildini #typepython

  19. paulproteus@vellum:~ $ echo $PATH /home/paulproteus/bin:/usr/bin:/usr/local/bin: paulproteus@vellum:~ $ python @phildini #typepython

  20. paulproteus@vellum:~ $ @phildini #typepython

  21. paulproteus@vellum:~ $ hexdump -C /usr/bin/python @phildini #typepython

  22. paulproteus@vellum:~ $ hexdump -C /usr/bin/python 00000000 7f 45 4c 46

    02 01 01 00 00 00 00 00 00 00 00 00 |.ELF............| 00000010 02 00 3e 00 01 00 00 00 55 49 57 00 00 00 00 00 |..>.....UIW.....| 00000020 40 00 00 00 00 00 00 00 08 15 33 00 00 00 00 00 |@.........3.....| 00000030 00 00 00 00 40 00 38 00 09 00 40 00 1c 00 1b 00 |[email protected]...@.....| 00000040 06 00 00 00 05 00 00 00 40 00 00 00 00 00 00 00 |........@.......| 00000050 40 00 40 00 00 00 00 00 40 00 40 00 00 00 00 00 |@.@.....@.@.....| 00000060 f8 01 00 00 00 00 00 00 f8 01 00 00 00 00 00 00 |................| 00000070 08 00 00 00 00 00 00 00 03 00 00 00 04 00 00 00 |................| 00000080 38 02 00 00 00 00 00 00 38 02 40 00 00 00 00 00 |8.......8.@.....| 00000090 38 02 40 00 00 00 00 00 1c 00 00 00 00 00 00 00 |8.@.............| @phildini #typepython

  23. paulproteus@vellum:~ $ @phildini #typepython

  24. paulproteus@vellum:~ $ file /usr/bin/python @phildini #typepython

  25. paulproteus@vellum:~ $ file /usr/bin/python /usr/bin/python: ELF 64-bit LSB executable @phildini

    #typepython

  26. for dir in os.getenv( 'PATH').split(':'): try: os.stat(dir + '/python') return

    dir except: pass raise CommandNotFound() @phildini #typepython

  27. bash pid: 1221 @phildini #typepython

  28. bash pid: 1221 paulproteus@vellum:~ $ @phildini #typepython

  29. bash pid: 1221 paulproteus@vellum:~ $ exec python @phildini #typepython

  30. python pid: 1221 @phildini #typepython

  31. python pid: 1221 @phildini #typepython

  32. python pid: 1221 paulproteus@vellum:~ $ @phildini #typepython

  33. python pid: 1221 paulproteus@vellum:~ $ [Process completed] @phildini #typepython

  34. bash pid: 1221 @phildini #typepython

  35. bash pid: 1221 fork() @phildini #typepython

  36. bash pid: 1221 fork() bash pid: 1222 @phildini #typepython

  37. bash pid: 1221 fork() bash pid: 1222 exec() @phildini #typepython

  38. bash pid: 1221 fork() python pid: 1222 exec() @phildini #typepython

  39. paulproteus@vellum:~ $ @phildini #typepython

  40. paulproteus@vellum:~ $ pstree @phildini #typepython

  41. paulproteus@vellum:~ $ pstree init─┬ ... ├─cron ... └─sshd─┬─bash───python └─bash───pstree @phildini

    #typepython

  42. Process Creation 1. Find binary in $PATH 2. Fork 3.

    Exec @phildini #typepython

  43. paulproteus@vellum:~ $ python -v @phildini #typepython

  44. # installing zipimport hook import zipimport # builtin # installed

    zipimport hook # /usr/lib/python2.7/site.pyc matches /usr/lib/python2.7/site.py import site # precompiled from /usr/ lib/python2.7/site.pyc # /usr/lib/python2.7/os.pyc matches /usr/lib/python2.7/os.py paulproteus@vellum:~ $ python -v @phildini #typepython

  45. bash pid: 1221 fork() python pid: 1222 exec( ‘/usr/bin/python’, [‘python’,

    ‘-v’] ) @phildini #typepython

  46. bash pid: 1221 fork() python pid: 1222 argv = [‘python’,

    ‘-v’] exec( ‘/usr/bin/python’, [‘python’, ‘-v’] ) @phildini #typepython

  47. python pid: 1222 argv = [‘python’] @phildini #typepython

  48. Python 2.7.6 (default, Apr 11 2014, 22:59:56) [GCC 4.8.2] on

    linux2 Type "help", "copyright", "credits" or "license" for more information. >>> @phildini #typepython
  49. None

  50. /dev/pts/3

  51. python pid: 1222 0: /dev/pts/3 @phildini #typepython

  52. python pid: 1222 0: /dev/pts/3 stdin @phildini #typepython

  53. python pid: 1222 0: /dev/pts/3 2 @phildini #typepython

  54. python pid: 1222 0: /dev/pts/3 termios 2 @phildini #typepython

  55. python pid: 1222 0: /dev/pts/3 termios 2 @phildini #typepython

  56. paulproteus@vellum:~ $ @phildini #typepython

  57. paulproteus@vellum:~ $ strace python @phildini #typepython

  58. paulproteus@vellum:~ $ strace python [...] read(0, @phildini #typepython

  59. paulproteus@vellum:~ $ strace python [...] read(0, 2 @phildini #typepython

  60. paulproteus@vellum:~ $ strace python [...] read(0, “2”, 1) 2 @phildini

    #typepython

  61. paulproteus@vellum:~ $ strace python [...] read(0, “2”, 1) read(0, 2

    @phildini #typepython

  62. paulproteus@vellum:~ $ strace python [...] read(0, “2”, 1) read(0, 2

    + @phildini #typepython

  63. paulproteus@vellum:~ $ strace python [...] read(0, “2”, 1) read(0, “+”,

    1) 2 + @phildini #typepython

  64. paulproteus@vellum:~ $ strace python [...] read(0, “2”, 1) read(0, “+”,

    1) read(0, “2”, 1) read(0, “\n”, 1) 2 + 2 Enter @phildini #typepython

  65. while True: line = ‘’ chr = sys.stdin.read(1) line +=

    chr if chr == ‘\n’: print eval(line) @phildini #typepython

  66. while True: line = ‘’ chr = sys.stdin.read(1) line +=

    chr if chr == ‘\n’: print eval(line) @phildini #typepython

  67. python pid: 1222 0: /dev/pts/3 1: /dev/pts/3 2: /dev/pts/3 @phildini

    #typepython

  68. bash pid: 1221 python pid: 1222 0: /dev/pts/3 1: /dev/pts/3

    2: /dev/pts/3 0: /dev/pts/3 1: /dev/pts/3 2: /dev/pts/3 @phildini #typepython

  69. bash pid: 1221 python pid: 1222 0: /dev/pts/3 1: /dev/pts/3

    2: /dev/pts/3 0: /dev/pts/3 1: /dev/pts/3 2: /dev/pts/3 foreground @phildini #typepython

  70. Ctrl C @phildini #typepython

  71. Ctrl C termios @phildini #typepython

  72. sigint Ctrl C termios @phildini #typepython

  73. python pid: 1222 sigint Ctrl C termios @phildini #typepython

  74. >>> @phildini #typepython

  75. >>> Crtl C @phildini #typepython

  76. >>> Crtl C KeyboardInterrupt >>> @phildini #typepython

  77. python pid: 1222 sigint @phildini #typepython

  78. python pid: 1222 sigint sig pipe @phildini #typepython

  79. cat pid: 1222 0: /dev/pts/3 Ctrl D termios @phildini #typepython

  80. cat pid: 1222 0: /dev/pts/3 Ctrl D termios @phildini #typepython

  81. python pid: 1222 0: /dev/pts/3 Ctrl D termios @phildini #typepython

  82. >>> import sys >>> sys.exit() @phildini #typepython

  83. >>> raise SystemExit() @phildini #typepython

  84. paulproteus@vellum:~ $ strace python @phildini #typepython

  85. paulproteus@vellum:~ $ strace python [...] exit(0 <no return …> @phildini

    #typepython

  86. paulproteus@vellum:~ $ strace python [...] exit(0 <no return …> paulproteus@vellum:~

    $ @phildini #typepython

  87. paulproteus@vellum:~ $ strace python [...] exit(0 <no return …> paulproteus@vellum:~

    $ echo $? @phildini #typepython

  88. paulproteus@vellum:~ $ strace python [...] exit(0 <no return …> paulproteus@vellum:~

    $ echo $? 0 @phildini #typepython

  89. >>> import sys >>> sys.exit(1) @phildini #typepython

  90. >>> import sys >>> sys.exit(1) paulproteus@vellum:~ $ echo $? 1

    @phildini #typepython

  91. bash pid: 1221 @phildini #typepython

  92. python pid: 1222 argv = [‘python’] bash pid: 1221 @phildini

    #typepython

  93. python pid: 1222 argv = [‘python’] 0: /dev/pts/3 1: /dev/pts/3

    2: /dev/pts/3 bash pid: 1221 @phildini #typepython

  94. python pid: 1222 argv = [‘python’] sigint sig pipe 0:

    /dev/pts/3 1: /dev/pts/3 2: /dev/pts/3 bash pid: 1221 @phildini #typepython

  95. Be Curious! • pstree • strace • file/hexdump @phildini #typepython

  96. Questions? Thanks! Philip James (@phildini) @phildini #typepython