Need max values in list of tuples, based on position

[Pancho]

On 11/11/2022 20:58, Thomas Passin wrote:
> On 11/11/2022 2:22 PM, Pancho via Python-list wrote:
>> On 11/11/2022 18:53, DFS wrote:
>>> On 11/11/2022 12:49 PM, Dennis Lee Bieber wrote:
>>>> On Fri, 11 Nov 2022 02:22:34 -0500, DFS <nospam at dfs.com> declaimed the
>>>> following:
>>>>
>>>>>
>>>>> [(0,11), (1,1),  (2,1),
>>>>>   (0,1) , (1,41), (2,2),
>>>>>   (0,9) , (1,3),  (2,12)]
>>>>>
>>>>> The set of values in elements[0] is {0,1,2}
>>>>>
>>>>> I want the set of max values in elements[1]: {11,41,12}
>>>>
>>>>     Do they have to be IN THAT ORDER?
>>>
>>> Yes.
>>>
>> Sets aren't ordered, which is why I gave my answer as a list. A 
>> wrongly ordered list, but I thought it rude to point out my own error, 
>> as no one else had. :-)
>>
>> Assuming you want numeric order of element[0], rather than first 
>> occurrence order of the element[0] in the original tuple list. In this 
>> example, they are both the same.
>>
>> Here is a corrected version
>>
>> from collections import OrderedDict
>> def build_max_dict( tups):
>>      dict =  OrderedDict()
>>      for (a,b) in tups:
>>          if (a in dict):
>>              if (b>dict[a]):
>>                  dict[a]=b
>>          else:
>>              dict[a]=b
>>      return(dict.values())
>>
>> This solution giving the answer as type odict_values. I'm not quite 
>> sure what this type is, but it seems to be a 
>> sequence/iterable/enumerable type, whatever the word is in Python.
>>
>> Caveat: I know very little about Python.
> 
> Kindly do not use "dict" as a variable name, since that shadows the 
> system's built-in name for a dictionary type.
> 

Yes, I half suspected it might cause subtle problems, I changed it to d, 
and then I changed it back, senility I guess :-).

That was one of the things I didn't like about Python. Lack of types and 
subsequent loss of intellisense is the thing I find hardest to deal with.