grouping a flat list of number by range

[joh12005]

Hello

... _, first_n = group[0]

what is the meaning of the underscore "_" ? is it a special var ? or
should it be readed as a way of unpacking a tuple in a non useful var ?
like

lost, first_n = group[0]

best regards.

 

[Steven Bethard]

... _, first_n = group[0]

what is the meaning of the underscore "_" ? is it a special var ? or
should it be readed as a way of unpacking a tuple in a non useful var ?
like

lost, first_n = group[0]

Yep, it's just another name. "lost" would have worked just as well.
It's pretty typical around here to see "_" used when a tuple is unpacked
but some of the values aren't used. So if you see something like::

for _, dirs, _ in os.walk(top):
...

it just means that the "..." code is only going to use "dirs" (not the
root path or files that are also available from the os.walk() iterator).

STeVe

 

[K.S.Sreeram]

Yup! '_' is just used as a dummy. Its a pretty common idiom. There's
nothing special about that variable.

Hello

... _, first_n = group[0]

what is the meaning of the underscore "_" ? is it a special var ? or
should it be readed as a way of unpacking a tuple in a non useful var ?
like

lost, first_n = group[0]

best regards.

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