Python for Ruby Programmers

Transcript

3. About Me

4. Web Mobile Embedded

12. That's it.

13. Ruby: 2006 Python: 2010

14. New appreciation Better Rubyist

15. What we'll cover

17. What we WON'T cover

19. What I'll try to convince you:

21. Zen of Python (abridged)

23. Example: Create a Person class

27. 13 Similarities

28. 1. Dynamically Typed

30. 2. Everything is an Object (even functions!)

32. 3. Arrays

35. 4. Hash Tables

38. 5. No special line terminators (no semicolons!)

39. 6. Strong functional programming paradigms

43. 7. Awesome function parameters

44. Optional / named arguments

46. Argument Unpacking

48. 8. Raising Exceptions

51. 9. Handling Exceptions

54. 10. One-line conditionals

57. 11. Nice interactive shells

59. 12. Strong object reflection features

60. steve = Person("Steve Ballmer", 54) steve.__dict__ >>> {'age': 54, 'name':

    'Steve Ballmer'} steve.__class__ >>> <class 'person.Person'> dir(steve) # all methods/attrbutes ['GOOGLE_DIRECTORS', '__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'age', 'greet', 'greet_google_directors', 'is_justin_beiber', 'name', 'say_name_and_age']

61. 13. Radically simpler than C++/Java!

62. 13 Differences

63. 1. No blocks

64. Blocks are the killer feature of Ruby

65. 1. Powerful metaprogramming 2. DSLs 3. Great frameworks (Rails)

66. Decorators are a powerful Python feature similar to blocks.

68. 2. First-class Functions

69. Functions as variables

72. 3. One-line lambdas, by design

75. Python pushes you to factor things out into granular methods.

77. Python even supports inner methods to this end.

79. 4. Python has “tuple,” an immutable list.

81. 5. Python has more fine-grained importing

85. 6. Python enforces indentation

86. In practice, this is pretty awesome.

87. Doesn't cause headaches. Makes code style more consistent.

88. 7. Python has more values that evaluate to False.

89. False None (nil) [ ], (), {} ' ' 0

90. 8. Instead of Enumerable, Python has built-in functions

91. filter() map() reduce()

92. Convenient, but not as powerful as Enumerable.

93. 9. Python has simpler conditionals

96. 10. No automatic return values

98. 11. “self” as an argument to every class instance method

101. 12. No powerful module mixins like Ruby.

102. Multiple inheritence only (yuck)

103. 13. Ruby has stronger metaprogramming features

104. Python doesn't have define_method class_eval method_missing

106. 5 Problem Domains

107. 1. Web Development

108. Ruby: Rails, Sinatra Ruby community is dominated by web development

110. 2. Mobile Applications

112. 3. Desktop Applications

114. 4. Scientific Programming

116. 5. Windows Deployment (if you must)

119. The Python community is just bigger.

120. “Feelings”

124. Rails still wins for web development.

126. Need to hire a Rubyist? Hire a Pythonista instead.

128. Wrap-up

130. MIKE LEONE panopticdev.com leone.panopticdev.com @panopticdev @facebiff THANK YOU!