On Mon, 30 May 2011 11:08:23 +0200, Laurent Claessens wrote:
> Le 30/05/2011 11:02, Terry Reedy a écrit :
>> On 5/30/2011 3:38 AM, Laurent wrote:
>>
>>> Cool. I was thinking that "5" was the name, but
>>> >>> 5.__add__(6)
>>> File "<stdin>", line 1
>>> 5.__add__(6)
>>
>>
>> Try 5 .__add__(6)
>
> What is the rationale behind the fact to add a space between "5" and
> ".__add__" ?
> Why does it work ?
Because . is an operator just like + * & etc.
>>> s = "hello world"
>>> s . upper ( )
'HELLO WORLD'
In the case of integer literals, you need the space, otherwise Python
will parse 5. as a float:
>>> 5.
5.0
>>> 5.__add__
File "<stdin>", line 1
5.__add__
^
SyntaxError: invalid syntax
>>> 5 .__add__
<method-wrapper '__add__' of int object at 0x8ce3d60>
--
Steven
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