The document discusses detonating (debunking) myths in Python. It addresses common misconceptions about regular expressions (regex), encodings, line breaks, and object orientation in Python. The author presents examples to demonstrate the actual behaviors and dispel misconceptions. For instance, it shows that raw strings in Python do not interpret escape characters unlike normal strings, and encoding declarations can be used to specify character encodings. The document aims to educate about proper Python concepts and usages.

1. DETONANDO
MITOS EM
PYTHON

2. DENIS COSTA
@deniscostadsc

3. “Existem alguns mitos
no mundo do python...”

4. “...e nós vamos
detoná-los hoje.”

5. “Tipo
Regex”

6. r'<[^>]*>'

7. r'Raw String'

8. >>> print('nn1')
1

9. >>> print(r'nn1')
nn1

10. >>> backslash = ''
>>> print(backslash)
>>> raw_string = re.compile(r'')
>>> raw_string.sub('1', backslash)
'1'

11. >>> backslash = ''
>>> print(backslash)
>>> normal_string = re.compile('')
>>> normal_string.sub('1', backslash)
'1'

12. Para aprender mais
http://docs.python.org/2/library/re.html
http://docs.python.org/2/reference/lexical_analysis.html#literals

13. “O todo
poderoso
encoding”

14. # -*- encoding: utf-8 -*-

15. r'coding[:=]s*([-w.]+)'
http://hg.python.org/cpython/file/0e41c4466d58/Parser/tokenizer.c#l208

16. Emacs
# -*- coding: <encoding name> -*-

17. Vim
# vim: set fileencoding=<encoding name> :

18. # coding: utf-8

19. Para aprender mais
http://www.python.org/dev/peps/pep-0263/

20. UnicodeDecodeError

21. Para aprender mais
http://www.youtube.com/watch?v=qa-VkmCSr0s

22. Quebras de linhas
onipresentes

23. a = 1 or
2

24. a = (1 or
2)

25. “Nem por
Odin, suporta
orientação a
objetos”

26. >>> l = [1, 2, 3, 4]
>>> len(l)
4

27. >>> l = [1, 2, 3, 4]
>>> l.__len__()
4

28. >>> n + 6
7

29. >>> n = 1
>>> n.__add__(6)
7

30. Perguntas?