List Comprehension - Printable Version

List Comprehension - Printable Version

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List Comprehension - zowhair - Dec-27-2017

matrix =  [  [ 1,2,3,4], [5,6,7,8],[9,10,11,12]]
[[row[i] for row in matrix] for i in range(4) ]

Will anyone explain these statements for me Idea

[[row[i] for row in matrix] for i in range(4) ]

Please explain this statement in detail
Thanks

RE: List Comprehension - metulburr - Dec-27-2017

if you decompress the list comp to a regular for loop it would look like this. Maybe that would help?

matrix =  [  [ 1,2,3,4], [5,6,7,8],[9,10,11,12]]

lst = []
for i in range(4):
   nested = []
   for row in matrix:
       nested.append(row[i])
   lst.append(nested)
print(lst)

RE: List Comprehension - zowhair - Dec-29-2017

Thanks man!!