Выступление на PYCON RUSSIA 2017

1. PYWAT
АЛЕКСАНДР ШВЕЦ

4. >>> [1,2,3] == sorted([1,2,3])

5. >>> [1,2,3] == sorted([1,2,3])
True

6. >>> [1,2,3] == sorted([1,2,3])
True
>>> (1,2,3) == sorted((1,2,3))

7. >>> [1,2,3] == sorted([1,2,3])
True
>>> (1,2,3) == sorted((1,2,3))
False

9. >>> [1,2,3] == sorted([1,2,3])
True
>>> (1,2,3) == sorted((1,2,3))
False

10. >>> a = 2, 1, 3

11. >>> a = 2, 1, 3
>>> sorted(a) == sorted(a)

12. >>> a = 2, 1, 3
>>> sorted(a) == sorted(a)
True

13. >>> a = 2, 1, 3
>>> sorted(a) == sorted(a)
True
>>> reversed(a) == reversed(a)

14. >>> a = 2, 1, 3
>>> sorted(a) == sorted(a)
True
>>> reversed(a) == reversed(a)
False

15. >>> a = 2, 1, 3
>>> sorted(a) == sorted(a)
True
>>> reversed(a) == reversed(a)
False
>>> b = reversed(a)
>>> sorted(b) == sorted(b)

16. >>> a = 2, 1, 3
>>> sorted(a) == sorted(a)
True
>>> reversed(a) == reversed(a)
False
>>> b = reversed(a)
>>> sorted(b) == sorted(b)
False

18. >>> a = 2, 1, 3
>>> sorted(a) == sorted(a)
True
>>> reversed(a) == reversed(a)
False
>>> b = reversed(a)
>>> sorted(b) == sorted(b)
False

19. >>> a = ([],)

20. >>> a = ([],)
>>> a[0].extend([1])

21. >>> a = ([],)
>>> a[0].extend([1])
>>> a[0]

22. >>> a = ([],)
>>> a[0].extend([1])
>>> a[0]
[1]

23. >>> a = ([],)
>>> a[0].extend([1])
>>> a[0]
[1]
>>> a[0] += [2]

24. >>> a = ([],)
>>> a[0].extend([1])
>>> a[0]
[1]
>>> a[0] += [2]
TypeError: 'tuple' object does not
support item assignment

25. >>> a = ([],)
>>> a[0].extend([1])
>>> a[0]
[1]
>>> a[0] += [2]
TypeError: 'tuple' object does not
support item assignment
>>> a[0]

26. >>> a = ([],)
>>> a[0].extend([1])
>>> a[0]
[1]
>>> a[0] += [2]
TypeError: 'tuple' object does not
support item assignment
>>> a[0]
[1, 2]

28. >>> a = ([],)
>>> a[0].extend([1])
>>> a[0]
[1]
>>> a[0] += [2]
TypeError: 'tuple' object does not
support item assignment
>>> a[0]
[1, 2]

29. >>> isinstance(type, object)

30. >>> isinstance(type, object)
True

31. >>> isinstance(type, object)
True
>>> isinstance(object, type)

32. >>> isinstance(type, object)
True
>>> isinstance(object, type)
True

34. >>> isinstance(type, object)
True
>>> isinstance(object, type)
True

35. >>> all([])

36. >>> all([])
True

37. >>> all([])
True
>>> all([[]])

38. >>> all([])
True
>>> all([[]])
False

39. >>> all([])
True
>>> all([[]])
False
>>> all([[[]]])

40. >>> all([])
True
>>> all([[]])
False
>>> all([[[]]])
True

42. >>> all([])
True
>>> all([[]])
False
>>> all([[[]]])
True

43. >>> sum("")

44. >>> sum("")
0

45. >>> sum("")
0
>>> sum("", ())

46. >>> sum("")
0
>>> sum("", ())
()

47. >>> sum("")
0
>>> sum("", ())
()
>>> sum("", [])

48. >>> sum("")
0
>>> sum("", ())
()
>>> sum("", [])
[]

49. >>> sum("")
0
>>> sum("", ())
()
>>> sum("", [])
[]
>>> sum("", {})

50. >>> sum("")
0
>>> sum("", ())
()
>>> sum("", [])
[]
>>> sum("", {})
{}

51. >>> sum("")
0
>>> sum("", ())
()
>>> sum("", [])
[]
>>> sum("", {})
{}
>>> sum("", "")

52. >>> sum("")
0
>>> sum("", ())
()
>>> sum("", [])
[]
>>> sum("", {})
{}
>>> sum("", "")
TypeError: sum() can't sum strings

54. >>> sum("")
0
>>> sum("", ())
()
>>> sum("", [])
[]
>>> sum("", {})
{}
>>> sum("", "")
TypeError: sum() can't sum strings

55. >>> a = 1

56. >>> a = 1
>>> def foo():
>>> return a
>>> foo()

57. >>> a = 1
>>> def foo():
>>> return a
>>> foo()
1

58. >>> a = 1
>>> def foo():
>>> return a
>>> foo()
1
>>> def bar():
>>> a += 1
>>> return a
>>> bar()

59. >>> a = 1
>>> def foo():
>>> return a
>>> foo()
1
>>> def bar():
>>> a += 1
>>> return a
>>> bar()
UnboundLocalError: local variable 'a'
referenced before assignment

61. >>> a = 1
>>> def foo():
>>> return a
>>> foo()
1
>>> def bar():
>>> a += 1
>>> return a
>>> bar()
UnboundLocalError: local variable 'a'
referenced before assignment

62. >>> x = float("nan")
>>> y = float("nan")

63. >>> x = float("nan")
>>> y = float("nan")
>>> x == x

64. >>> x = float("nan")
>>> y = float("nan")
>>> x == x
False

65. >>> x = float("nan")
>>> y = float("nan")
>>> x == x
False
>>> [x] == [x]

66. >>> x = float("nan")
>>> y = float("nan")
>>> x == x
False
>>> [x] == [x]
True

67. >>> x = float("nan")
>>> y = float("nan")
>>> x == x
False
>>> [x] == [x]
True
>>> [x] == [y]

68. >>> x = float("nan")
>>> y = float("nan")
>>> x == x
False
>>> [x] == [x]
True
>>> [x] == [y]
False

70. >>> x = float("nan")
>>> y = float("nan")
>>> x == x
False
>>> [x] == [x]
True
>>> [x] == [y]
False

71. >>> a = 100
>>> b = 100

72. >>> a = 100
>>> b = 100
>>> a is b

73. >>> a = 100
>>> b = 100
>>> a is b
True

74. >>> a = 100
>>> b = 100
>>> a is b
True
>>> a = 300
>>> b = 300

75. >>> a = 100
>>> b = 100
>>> a is b
True
>>> a = 300
>>> b = 300
>>> a is b

76. >>> a = 100
>>> b = 100
>>> a is b
True
>>> a = 300
>>> b = 300
>>> a is b
False

77. >>> a = 100
>>> b = 100
>>> a is b
True
>>> a = 300
>>> b = 300
>>> a is b
False
>>> a, b = 300, 300
>>> a is b

78. >>> a = 100
>>> b = 100
>>> a is b
True
>>> a = 300
>>> b = 300
>>> a is b
False
>>> a, b = 300, 300
>>> a is b
True

80. >>> a = 100
>>> b = 100
>>> a is b
True
>>> a = 300
>>> b = 300
>>> a is b
False
>>> a, b = 300, 300
>>> a is b
True

83. >>> x, y = ???
>>> x + y == y + x
False

84. [0], [1]

85. >>> x, y = ???
>>> min(x, y) == min(y, x)
False

86. {0}, {1}

88. >>> x = ???
>>> x < x
True

91. https://github.com/cosmologicon/pywat

92. СПАСИБО
fb.com/ashwets
ashvets@mymary.ru
Александр Швец
технический директор
системы Marilyn