CODEWITHSUNDEEP
python
tezr
tezr

Reputation: 33

Python:what does "pix = im_pixel[j, i]" means?

I'm a newbie of python.

I couldn't understand the usage of pix = im_pixel[j, i].

In [], there is a comma (,).. Is this the right syntax?

Upvotes: 0

Views: 95

Answers (1)

shuttle87
shuttle87

Reputation: 15934

im_pixel[j,i] just means that the key being passed to im_pixel is the tuple j, i. This will call whatever im_pixel has defined for __getitem__ with this tuple as a parameter. What this does will be defined by the type of im_pixel

For example if im_pixel was a dictionary it would fetch the key (j, i). Anything immutable and hashable is allowed to be a dictionary key in Python and a tuple is both immutable and hashable so this would be allowed for a dictionary type. As Duncan mentions the whole key must be immutable, so the individual elements of the tuple must also be immutable as well.

Upvotes: 2

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