Python 3
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The document discusses various Python concepts, particularly the differences between Python 2 and Python 3, covering topics like generators, decorators, comprehensions, and new features introduced in Python 3. It highlights changes in syntax, string handling, and functionalities, as well as tools for porting code from Python 2 to Python 3, such as 2to3 and six. The document serves as a resource for understanding Python evolution and best practices.
![comprehension
{x for x in [1,2,3,3]}
globo
.com](https://image.slidesharecdn.com/python3-121128193740-phpapp02/85/Python-3-21-320.jpg)
![print (python2)
>>> print(", ".join(["banana", "batata"]))
banana, batata
globo
.com](https://image.slidesharecdn.com/python3-121128193740-phpapp02/85/Python-3-36-320.jpg)
![print (python3)
>>> alimentos = ["banana", "batata"]
>>> print(*alimentos, sep=", ")
banana, batata
globo
.com](https://image.slidesharecdn.com/python3-121128193740-phpapp02/85/Python-3-37-320.jpg)
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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