Palestra de Python básico e Flask apresentada na Semana Acadêmica Bilac 2015 Basic Python and Flask presentation given at Semana Acadêmica Bilac 2015

1. Do .egg à Web
Usando o microframework Flask
por Arthur Bressan
11 e 12 de Novembro de 2015
arthurbressan2@hotmail.com

3. Shell do Python
$ python
Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

4. Contas matemáticas
>>> 1 + 2
3
>>> 3 * 3
9
>>> 2 ** 10
1024
>>> 2 / 2
1
>>> 10 / 3
3
>>> 10.0 / 3
3.3333333333333335
>>> 10 // 3
3
>>> 10.0 // 3
3.0
>>> 4 + 5 * 10
54

5. Variáveis
>>> altura = 10
>>> largura = 20
>>> profundidade = 5
>>> volume = altura * largura * profundidade
>>> altura
10
>>> largura
20
>>> profundidade
5
>>> volume
1000

6. Strings
>>> Hello
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'Hello' is not defined
>>> "Hello"
'Hello'
>>> "World"
'World'
>>> u"Olá mundo!"
'Olxc3xa1 mundo!'
>>> print u'Olá mundo'
Olá mundo!

7. Índices
>>> s = "Hello World"
>>> s[0]
'H'
>>> s[-1]
'd'
>>> s[:5]
'Hello'
>>> s[6:]
'World'
>>> s[6:9]
'Wor'

8. Listas
>>> l = []
>>> l
[]
>>> l = [1, 2, 'abc']
>>> l
[1, 2, 'abc']
>>> l[0]
1
>>> l[2]
'abc'
>>> l[1:2]
[2]
>>> l = []
>>> l.append(1)
>>> l
[1]
>>> l.append(2)
>>> l
[1, 2]
>>> l.append([1,2])
>>> l
[1, 2, [1, 2]]
>>> l.extend([1, 2])
[1, 2, [1, 2], 1, 2]
>>> len(l)
5
>>> l = [1, 2, 3]
>>> 1 in l
True
>>> 5 in l
False

9. if/elif/else
>>> l = [1, 2, 3]
>>> if 1 in l:
... print 'a'
... elif 2 not in l:
... print 'b'
... else:
... print 'c'
...
'a'

10. for
>>> l = [1, 2, 3]
>>> for n in l:
... print n
...
1
2
3
>>> s = 'Hello world'
>>> for c in s:
... print c
...

11. Funções
>>> def func(x):
... print "Hello", x
...
>>> func(1)
Hello 1
>>> def gunc(x):
... return x + 1
...
>>> gunc(0)
1
>>> x = gunc(1)
>>> x
2

12. Executando arquivos .py
$ echo "print 'Hello World'" > arquivo.py
$ python arquivo.py
Hello World

14. Dúvidas?

15. Obrigado pela atenção e happy coding!!
arthurpbressan@gmail.com
https://github.com/ArthurPBressan
https://github.com/ArthurPBressan/egg-a-web

16. Bônus
https://exploreflask.com/