Intro to Python

Slides for the Introduction to Python workshop at WTH (2018)

### Tasks

- https://repl.it/@Geekfish/python
- https://repl.it/@Geekfish/RoadTrip
- https://repl.it/@Geekfish/RoadTrip2

### Tutorials/Resources

- [Python 3 Documentation](https://docs.python.org/3/)
- [PEP8 (Python styling guide)](https://www.python.org/dev/peps/pep-0008/)
- [Learn Python the Hard Way](https://learnpythonthehardway.org/python3/)
- [DjangoGirls Django Tutorial](https://tutorial.djangogirls.org/)

### Beginner-friendly conferences

- [PyCon UK](http://2018.pyconuk.org/) (Cardiff, September)
- [EuroPython](https://ep2018.europython.eu/) (Edinburgh, July)
- [DjangoCon Europe](https://2018.djangocon.eu/) (Heidelberg Germany, May)

Transcript

1. INTRO TO PYTHON
2. Hi
3. Eleni Lixourioti aka @geekfish_
4. I ❤ python ! ! " #
5. PYTHON
6. Programming language
7. Hi
10. Guido Van Rossum
12. B.D.F.L.
14. GENERAL-PURPOSE
16. ▸ Marketing/Advertising ▸ Telecommunications ▸ Commerce ▸ Governance ▸ Graphics ▸ CGI ▸ Finance ▸ Medicine ▸ Engineering ▸ Home automation ▸ …
18. <WEB DEVELOPMENT />
19. DATA SCIENCE / MACHINE LEARNING
21. DevOps
22. Education
24. Games development
27. SURVEY
28. WHY BOTHER?
29. Windows Mac Linux Mobile (somewhat)
30. You can start small
31. and grow REALLY BIG
32. The most important thing: ?
33. The most important thing: Python Philosophy
34. import this
35. ZEN OF PYTHON
36. > import this The Zen of Python, by Tim Peters Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense. Readability counts. Special cases aren't special enough to break the rules. Although practicality beats purity. Errors should never pass silently. Unless explicitly silenced. In the face of ambiguity, refuse the temptation to guess. There should be one-- and preferably only one --obvious way to do it. Although that way may not be obvious at first unless you're Dutch. Now is better than never. Although never is often better than *right* now. If the implementation is hard to explain, it's a bad idea. If the implementation is easy to explain, it may be a good idea. Namespaces are one honking great idea -- let's do more of those!
37. Beautiful is better than ugly
38. Simple is better than complex
39. ...
40. Readability counts Readability counts
41. Computer Humans
42. Keep it simple
43. class HelloWorldApp { public static void main(String[] args) { System.out.println("Hello Java!"); } }
44. print("Hello Python!")
45. Be expressive
46. rainbow_colours = ['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet'] for colour in rainbow_colours: print(colour)
47. https://repl.it/@Geekfish/python
48. print("Hello Python!") 42 + 9 5 * 6
49. Variables
50. name = "Linda"
51. name = "Linda" print("Hello " + name)
52. Strings
53. name = "Linda" occupation = "Python-Whisperer" print(f"{name}: professional {occupation}")
54. Numbers
55. a = 10 b = 5 a + b a - b a * b a / b
56. Comparisons
57. 10 == 5 10 == 10 10 > 5 10 < 5 10 != 5 10 >= 5
58. "potato" == "tomato" "tomato" == "tomato" "TOMATO" == "tomato"
59. "Bob" > "Alice"
60. !
61. "Xena" > "Hercules"
62. !
63. Now with variables!
64. a = 10 b = 5 a == b a > b
65. Conditionals
66. if / else
67. animal = "cobra" if animal == "python": print("Are you related to Python?") else: print("nevermind...")
68. Why don't we use {brackets} ?
69. Indentation
70. "There should be one-- and preferably only one --obvious way to do it" ~ Zen of Python
71. 4 spaces
72. ....block_a ........block_b ........still_block_b ........more_block_b ............block_c ....back_to_block_a
73. if / elif / else
74. age = 30 if age < 8: print("Sorry, you are not allowed into the Haunted house!") elif age < 12: print("Sorry, you are not allowed to ride the roller coaster") else: print("Being a grown-up is great!")
75. ?!? Errors ? &*!@£ !
76. animal = "turtle" print(f"I love my pet {aminal}") # NameError: name 'aminal' is not defined
77. "Xena" > 9000 # TypeError: '>' not supported between instances of 'str' and 'int'
78. Things will break a lot ! "
79. Deep breath, patience, read carefully
80. But if that fails Google may help too !
81. Comments
82. # this line is completely ignored! print("Hello!) # print("Hi!") print("How rude...")
83. ADVENTURE TIME
84. https://repl.it/@Geekfish/RoadTrip
85. Multiple conditions
86. if sky == "blue": if temperature > 20: print("Let's go swimming!") # Same as: if sky == "blue" and temperature > 20: print("Let's go swimming!")
87. 10 == 10 and 20 < 21 5 > 10 or 100 > 99
88. Functions
89. name = "Linda" occupation = "Python-Whisperer" print(f"{name}: professional {occupation}")
90. def print_business_card(name, occupation): print(f"{name}: professional {occupation}") print_business_card("Linda", "Python-Whisperer") print_business_card("Alice", "Potato Chip Inspector")
91. RETURN
92. def get_business_card(name, occupation): return f"{name}: professional {occupation}" linda_card = get_business_card("Linda", "Python-Whisperer") alice_card = get_business_card("Alice", "Potato Chip Inspector") print(f"Here are my associates: {linda_card} and {alice_card}")
93. Did you return??? — Post it note from my boss myself
94. Built-in functions
95. print("giraffe") # giraffe len("giraffe") # 7 min(4, 10, 2, 9) # 2 max(4, 10, 2, 9) # 10 int("100") 100 str(100) "100"
96. Object Functions
97. "hello".upper()
98. ADVENTURE TIME (TAKE 2)
99. https://repl.it/@Geekfish/RoadTrip2
100. Optional
101. Lists & Loops
102. rainbow_colours = ['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet'] for colour in rainbow_colours: print(colour)
103. Dictionaries
104. human = { "name": "Louise", "favourite_colour": "green", } human["name"] # Louise human["favourite_colour"] # green
105. Built-in modules
106. import this
107. import random random.choice(['work', 'study', 'play', 'sleep']) # sleep, hopefully? # --- or --- from random import choice choice(['work', 'study', 'play', 'sleep'])
108. from datetime import datetime print(datetime.now())
109. TUTORIALS/RESOURCES ▸ Python 3 Documentation ▸ PEP8 (Python styling guide) ▸ Learn Python the Hard Way ▸ DjangoGirls Django Tutorial
110. HUMANS ▸ WTH Slack (#code_talk) ▸ CodeHub Bristol ▸ Python DBBUG
111. BEGINNER-FRIENDLY CONFERENCES ▸ PyCon UK (Cardiff, September) ▸ EuroPython (Edinburgh, July) ▸ DjangoCon Europe (Heidelberg Germany, May)
112. Thank you ❤ Questions / Support ? contact@eleni.co @geekfish_