On 11/9/2010 9:14 AM, Ciccio wrote:
Hi all,
hope you can help me understanding why the following happens:
In [213]: g = {'a': ['a1','a2'], 'b':['b1','b2']}
In [214]: rg = dict.fromkeys(g.keys(),[])
If you rewrite this as
bl = []
rg = dict.fromkeys(g.keys(),bl)
is the answer any more obvious?
In [215]: rg
Out[215]: {'a': [], 'b': []}
In [216]: rg['a'].append('x')
In [217]: rg
Out[217]: {'a': ['x'], 'b': ['x']}
What I meant was appending 'x' to the list pointed by the key 'a' in the
dictionary 'rg'. Why rg['b'] is written too?
--
Terry Jan Reedy
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