Converting list of tuple to list

[Tim Chase]

On 2018-03-29 20:42, Ganesh Pal wrote:
> I have a list of tuple say   [(1, 2, 1412734464L, 280), (2, 5,
> 1582956032L, 351), (3, 4, 969216L, 425)] .  I need to convert the
> above as ['1,2,1412734464:280',
> '2,5,1582956032:351', '3,4,969216:425']
> 
> Here is my Solution , Any  suggestion or optimizations are welcome .
> 
> Solution 1:
> 
> >>> list_tuple = [(1, 2, 1412734464L, 280), (2, 5, 1582956032L,
> >>> 351), (3, 4, 969216L, 425)]
> >>> expected_list = []  
> >>> for elements in list_tuple:  
> ...     element = "%s,%s,%s:%s" % (elements)
> ...     expected_list.append(element)

First, I'd do this but as a list comprehension:

  expected_list = [
    "%s,%s,%s:%s" % elements
    for elements in list_tuple
    ]

Second, it might add greater clarity (and allow for easier
reformatting) if you give names to them:

  expected_list = [
    "%i,%i,%i:%i" % (
      index,
      count,
      timestamp,
      weight,
      )
    for index, count, timestamp, weight in list_tuple
    ]

That way, if you wanted to remove some of the items from formatting
or change their order, it's much easier.

Since your elements seem to be in the order you want to assemble them
and you are using *all* of the elements, I'd go with the first one.
But if you need to change things up (either omitting fields or
changing the order), I'd switch to the second version.

-tkc