[10] Comentário enviado por
Miojo em 23/02/2010 - 19:55h:
>>> # Para transformar um número em float (com casas decimais):
>>> float(42)
42.0
>>> # Para pegar os 3 últimos caracteres de uma string:
>>> 'spam'[-3:]
'pam'
>>> # Mas para saber se uma string começa ou termina com outra, use o método str.startswith e str.endwith:
>>> 'spam'.endswith('pam')
True
>>> 'spam'.endswith('eggs')
False
>>> 'eggs'.startswith('eg')
True
>>> for i in ['Spam', 'Eggs']:
... print 'I like Python and %s' % i # Esta linha está indentada com 4 espaços. Só dá para ver em fontes mono-espaçadas
...
I like Python and Spam
I like Python and Eggs
>>> 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!
>>> import __hello__
Hello world...
>>> from __future__ import braces
File "<stdin>", line 1
SyntaxError: not a chance
>>> import sys
>>> sys.exit(0)
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