loops - Iterating over a 2 dimensional python list -


this question has answer here:

i have created 2 dimension array like:

rows =3 columns= 2 mylist = [[0 x in range(columns)] x in range(rows)] in range(rows):     j in range(columns):         mylist[i][j] = '%s,%s'%(i,j) print mylist

printing list gives output:

[  ['0,0', '0,1'], ['1,0', '1,1'], ['2,0', '2,1']   ]

where each list item string of format 'row,column'

now given list, want iterate through in order:

'0,0' '1,0' '2,0' '0,1' '1,1' '2,1'

that iterate through 1st column 2nd column , on. how do loop ?

this question pertains pure python list while question marked same pertains numpy arrays. different

use zip , itertools.chain. like:

>>> itertools import chain >>> l = chain.from_iterable(zip(*l)) <itertools.chain object @ 0x104612610> >>> list(l) ['0,0', '1,0', '2,0', '0,1', '1,1', '2,1']

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