Pycon 2019 The Refactoring Balance Beam

Transcript

6. Why refactor?
7. Why refactor?
17. Common Code Smell #1 It’s too long!
18. • • • ◦ ◦
20. • •
21. • •
23. Code Smells: Long methods • • • ◦ ◦ ◦ ◦
24. Tool: Replace Method with Method Object
25. Tool: Replace Method with Method Object
26. Tool: Introduce a parameter object
27. • • • ◦
28. Common Code Smell #2: It’s not useful enough!
29. • • • ◦ ◦ ◦
32. • • • ◦ ◦
33. Common Code Smell #3: OOP issues
34. Code smell: Divergent change • • • ◦ ◦
35. Code smell: Shotgun surgery • • • ◦ ◦
36. Code smell: shotgun surgery
37. Tool: Move Class
38. Code smell: Parallel inheritance hierarchies • ◦ • • ◦ ◦
39. Code Smell: Parallel inheritance hierarchies
40. Tool: Move Class
41. • • • ◦ ◦
42. • • • ◦ ◦
43. Tool: Extract Class
44. Tool: Extract Class
45. • • •
46. Tool: Replace Type Code with State
47. • • • ◦ ◦
48. Tool: Hide Delegate
49. Tool: Hide Delegate
50. • • • ◦
51. • • • ◦
52. Do I need to inherit this class?
54. Lets talk Pythonic Code Smells!
55. • • • ◦ ◦ ◦
56. • • • ◦ ◦
57. Codesmell: Unnecessary boilerplate code
58. Dataclasses and attrs
59. Dataclasses and attrs
60. • • • ◦
61. • • • ◦
84. • ◦ • ◦
85. • • ◦ ◦ ◦
86. • •
87. • •
88. • •
91. • (Expand) (Contract) (Transition)
92. • •
107. THANK YOU! @amandasopkin
108. Sources Flat Icon: https://www.flaticon.com/ Refactoring Python by Brett Slatkin: https://www.youtube.com/watch?v=D_6ybDcU5gc Real Python: https://realpython.com/python-refactoring/ Pep 20: https://www.python.org/dev/peps/pep-0020/ Beyond Pep 8 by Raymond Hettinger: https://www.youtube.com/watch?v=wf-BqAjZb8M Refactoring by Martin Fowler: https://www.csie.ntu.edu.tw/~r95004/Refactoring_improving_the_design_of_existing_code.pdf