Find the longest characters string in list with tuples

Question

I am looking for the longest characters string in a list with tuple couples. But only on the first element of all tuples.

VMT = [('T_WIN2019_04.2020', 'Microsoft Windows Server 2016 (64-bit)'), ('T_CENTOS_7.8_04.2020', 'CentOS 7 (64-bit)'), ('T_WIN2016_05.2019', 'Microsoft  Windows Server 2016 (64-bit)'), ('T_W2019_STD_EN', 'Microsoft Windows Server 2016   (64-bit)'), ('T_W2016_DTC_EN', 'Microsoft Windows Server 2016 (64-bit)')]

I use this :

max(VMT, key=len)[0]
'T_WIN2019_04.2020'

T_WIN2019_04.2020 = 16 chars

Should be :

'T_CENTOS_7.8_04.2020'

T_CENTOS_7.8_04.2020 = 20 chars

I think the calculation is done on the whole tuple but not the first element of tuples.

You're finding the longest *tuple*. If you want to compare the lengths of the tuples' elements, your key function needs to do that. — jonrsharpe, Jun 08 '20 at 12:02
Flatten the list: `max([item for tpl in VMT for item in tpl], key=len)` >> 'Microsoft Windows Server 2016 (64-bit)' — Maurice Meyer, Jun 08 '20 at 12:08
True, but I would like to find the longest string only in the first element of tuples — Bernard Jaulin, Jun 08 '20 at 12:15

score 2 · Accepted Answer · answered Jun 08 '20 at 12:28

2

key on max function should be the length of the first element of the tuples:

max(VMT, key=lambda t: len(t[0]))[0]

'T_CENTOS_7.8_04.2020'

answered Jun 08 '20 at 12:28

ywbaek

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Find the longest characters string in list with tuples

1 Answers1