list behavior

[Rene Aguirre]

Hello everybody,

I needed to add a list to a dictionary, something very simple:[color=blue][color=green][color=darkred]
>>> d = {}
>>> l = []
>>> l.append(1)
>>> d["one"] = l
>>> d[/color][/color][/color]
{'one': [1]}

Buen, when I just move the 'append' statement to the dictionary
assigment then:[color=blue][color=green][color=darkred]
>>> l = []
>>> d = {}
>>> d["one"] = l.append(1)
>>> d[/color][/color][/color]
{'one': None}

Not what I expected, then I came to the conclusion that
[].append(value) returns 'None', why?

Rene A.

[anton muhin]

Re: list behavior

Rene Aguirre wrote:[color=blue]
> Hello everybody,
>
> I needed to add a list to a dictionary, something very simple:
>[color=green][color=darkred]
>>>>d = {}
>>>>l = []
>>>>l.append( 1)
>>>>d["one"] = l
>>>>d[/color][/color]
>
> {'one': [1]}
>
> Buen, when I just move the 'append' statement to the dictionary
> assigment then:
>[color=green][color=darkred]
>>>>l = []
>>>>d = {}
>>>>d["one"] = l.append(1)
>>>>d[/color][/color]
>
> {'one': None}
>
> Not what I expected, then I came to the conclusion that
> [].append(value) returns 'None', why?
>
> Rene A.[/color]

append is what is called procedure in other languages.

d["one"].append(1) should work

hth,
anton.