append on lists

[Tino Wildenhain]

Armin wrote:
...
>>
>> Because .append() mutates 'a' and appends the item in-place rather
>> than creating and returning a new list with the item appended, and
>> it's good Python style for mutating methods to have no return value
>> (since all functions must have some return value, Python uses None
>> when the function doesn't explicitly return anything).
> 
> Yes, but this is very unconvenient.
> If d should reference the list a extended with a single list element
> you need at least two lines
> 
> a.append(7)
> d=a
> 
> and not more intuitive d = a.append(7)

Nope. Why wouln'd you just use a instead of d? And if you
want a not to be modified in place, just write: d=a+[7]

T.
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