Python 3
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A versão 3 do Python teve seu lançamento final 2008, mas ainda há muitas dúvidas se já está na hora de escrever aplicações usando python 3. Eu irei mostrar sobre as diferenças entre o python 2 e o 3, as novidades e como portar seu código para o python 3.
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Python 3
- 2. ‣ o que os outros pensam... globo .com
- 3. ‣ o que eu penso... globo .com
- 4. ‣ o que minha mãe pensa... globo .com
- 5. ‣ como realmente é! globo .com
- 6. python 2
- 7. ‣ pep8 ‣ generators ‣ zen of python ‣ iterators ‣ decorators ‣ comprehension ‣ descriptors ‣ abstract ‣ metaclass ‣ magic methods ‣ context manager ‣ subproccess ‣ multiproccess globo .com
- 8. mas...
- 9. ‣ unicode ‣ classes new x old style ‣ // vs / ‣ print vs print() ‣ int vs long ‣ urllib, urllib2, urlparse ‣ xmlrpclib, DocXMLRPCServer, SimpleXMLRPCServer globo .com
- 10. :(
- 11. python3 ‣ pep8 ‣ zen of python ‣ generators ‣ iterators ‣ objetos globo .com
- 12. python3.0 2008.. globo .com
- 13. python3.0 ‣ pip, distribute não funcionava no python3 ‣ 2to3 não foi suficiente globo .com
- 14. python3.3 ‣ pip, distribute ‣ venv nativo ‣ 2to3, 3to2, six ‣ várias features já funcionam no python2.7 globo .com
- 16. divisão (python2) >>> 4 / 2 2 >>> 3 / 2 1 globo .com
- 17. divisão (python3) >>> 3 / 2 1.5 globo .com
- 18. divisão (python2) from __future__ import division >>> 3 / 2 1.5 globo .com
- 19. divisão (python2) from __future__ import division >>> 3 // 2 1 globo .com
- 20. string.format() “{0} - {1}”.format(“andrews”, 19) “{name} - {idade}”.format(name=”andrews”, idade=19) globo .com
- 21. comprehension {x for x in [1,2,3,3]} globo .com
- 22. comprehension {key.upper(): value for key, value in d.items()} globo .com
- 26. bytes e strings bytes para transferência string para representação globo .com
- 27. bytes e strings bytes (python3) == str (python2) string (python3 == bytes (python2) globo .com
- 28. bytes e strings (python2) u"andrews " + b"medina" u”andrews medina” globo .com
- 29. bytes e strings (python3) >>> u"andrews " + b"medina" Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: Can't convert 'bytes' object to str implicitly globo .com
- 30. strings para bytes u"andrews ".encode(“utf-8”) + b"medina" globo .com
- 31. bytes para strings u"andrews " + b"medina".decode(“utf-8”) globo .com
- 32. print objeto novos parâmetros (sep, end, file, flush) globo .com
- 33. print (python2) >>> help(print) File "<stdin>", line 1 help(print) ^ SyntaxError: invalid syntax globo .com
- 34. print (python3) >>> help(print) globo .com
- 35. print (python2) >>> from __future__ import print_function >>> help(print) globo .com
- 36. print (python2) >>> print(", ".join(["banana", "batata"])) banana, batata globo .com
- 37. print (python3) >>> alimentos = ["banana", "batata"] >>> print(*alimentos, sep=", ") banana, batata globo .com
- 38. print (python3) from StringIO import StringIO out = StringIO() >>> print("ble", file=out) >>> out.getvalue() 'blen' globo .com
- 39. range, zip, map, filter retornam iterators globo .com
- 40. range, zip, map, filter lista = list(range(10)) globo .com
- 41. range, zip, map, filter for item in range(10): print item globo .com
- 42. expections except IOError as e: globo .com
- 43. class Class: new style por padrão globo .com
- 44. int int = long globo .com
- 45. novidades
- 46. annotations adiciona meta dados em uma função globo .com
- 47. annotations def hello(name: str, age: int) -> int: print(name, age) globo .com
- 48. annotations >>> hello.__annotations__ {'return': <class 'int'>, 'name': <class 'str'>, 'age': <class 'int'>} globo .com
- 49. annotations >>> hello("ble", "ble") ble ble globo .com
- 50. io io.FileIO io.StringIO io.BufferIO globo .com
- 51. concurrent.future paralelismo globo .com
- 52. concurrent.future interface Executor globo .com
- 53. concurrent.future from concurrent.futures import ThreadPoolExecutor with ThreadPoolExecutor(max_workers=1) as executor: future = executor.submit(pow, 323, 1235) print(future.result()) globo .com
- 54. concurrent.future from concurrent.futures import ProcessPoolExecutor with ProcessPoolExecutor(max_workers=4) as executor: future = executor.submit(pow, 323, 1235) print(future.result()) globo .com
- 55. functools.lru_cache memoização nativa globo .com
- 56. functools.lru_cache from functools import lru_cache @lru_cache(maxsize=None) def fib(n): if n < 2: return n return fib(n-1) + fib(n-2) globo .com
- 60. pep 420 Implicit Namespace Packages globo .com
- 61. como portar
- 63. branches diferentes manter dois projetos :( globo .com
- 64. 2to3 convertor automágico globo .com
- 65. 2to3 print “ble” -> print(ble) except Exception, e -> except Exception as e globo .com
- 66. 2to3 2to3=true #distribute globo .com
- 67. 3to2 globo .com
- 68. mesma base de código tratamento de excessões globo .com
- 69. six :) globo .com
- 70. leitura ‣ http://python3porting.com/ ‣ http://docs.python.org/3/ ‣ http://getpython3.com/diveintopython3/ globo .com
- 71. perguntas?
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