Lawrence D’Oliveiro writes:
> On Tuesday, September 27, 2016 at 8:08:46 PM UTC+13, Nagy László Zsolt wrote:
>> d1 = {'a':1, 'b':2}
>> d2 = {'c':3, 'd':4}
>> d3 = {'e':5, 'f':6}
>>
>> Is there a version that is as effective as #3, but as clean and nice as #4?
>
> dict(dict(d1, **d2), **d3)
Nice expression. But that's not available if the keys are not strings:
dict({}, **{ 1:3 })
==>
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: keyword arguments must be strings
On the other hand, '1' seemed to work (in Python 3.4.3) as key, though 1
cannot possibly be a keyword parameter in a function definition :)
Also related to the use of **, are there any practical limitations to
how many parameters a Python function may have? Or is it guaranteed safe
to spread, say, hundreds of thousands of dictionary keys this way? Just
wondering.
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