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To: python-list@python.org
Subject: Re: Tuples and immutability
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Date: Sun, 02 Mar 2014 15:37:44 +0100
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On Sun, 02 Mar 2014 15:17:11 +0100, Eric Jacoboni  =

<eric.jacoboni@gmail.com> wrote:

> Le 02/03/2014 15:05, Mark Lawrence a =C3=A9crit :
>
>> The behaviour is consistent except when you try to modify a tuple.
>>
>
> Not in my opinion...
>
> li =3D [10, 30]
> li =3D li + "spam"   --> TypeError: can only concatenate list (not "st=
r")
> li +=3D "spam"       --> Ok
>

possibly because you expect +=3D to take "spam" as a string, but have yo=
u  =

looked at the result?

In [1]: mylist =3D ['1', '2']

In [2]: mylist +=3D 'spam'

In [3]: mylist
Out[3]: ['1', '2', 's', 'p', 'a', 'm']

consequently, try adding something that can not be interpreted as a  =

sequence:

In [4]: mylist +=3D 3
------------------------------------------------------------------------=
---
TypeError                                 Traceback (most recent call la=
st)
<ipython-input-4-782b544a29d1> in <module>()
----> 1 mylist +=3D 3

TypeError: 'int' object is not iterable


-- =

Vriendelijke groeten / Kind regards,

Albert Visser

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