Simple question on indexing

[Tartifola]

Hi,
I would like to obtain the position index in a tuple when an IF
statement is true. Something like

a=['aaa','bbb','ccc']
[ ??? for name in a if name == 'bbb']
1

but I'm not able to find the name of the function ??? in the python documentation, any help?
Thanks

 

[Jon Clements]

Hi,
I would like to obtain the position index in a tuple when an IF
statement is true. Something like

a=['aaa','bbb','ccc']
[ ??? for name in a if name == 'bbb']
1

but I'm not able to find the name of the function ??? in the python documentation, any help?
Thanks

Ummm, that's a list not a tuple: I'll assume you meant sequence.

This will generate a list of indexes which match the criteria:

a = [ 1, 2, 3, 2, 5, 7]
[elno for elno,el in enumerate(a) if el == 2]

[1, 3]

hth
Jon.

 

[Christoph Haas]

I would like to obtain the position index in a tuple when an IF
statement is true. Something like

a=['aaa','bbb','ccc']
[ ??? for name in a if name == 'bbb']
1

What about:

[ x for x,y in enumerate(a) if y == 'bbb' ]

Or if there is only one element 'bbb':

a.index('bbb')

Kindly
Christoph