Re: How to initialize an array with a large number of members ?
David Lemper wrote: ... Python. Using version 3.0 # script23 from array import array < see failed initialization attempts below > tally = array('H',for i in range(75) : [0]) tally = array('H',[for i in range(75) : 0]) tally = array('H',range(75) : [0]) tally = array('H',range(75) [0]) Above give either Syntax error or TypeError All examples of sequences in docs show only a few members being initialized. Array doc says an iterator can be used, but doesn't show how. First, [1,2,3] is iterable. You could look up iterators or generators or list comprehension, but since it's the holidays: import array tally = array.array('H', (0 for i in range(75)))# a generator tally = array.array('H', [0 for i in range(75)])# list comprehension What would you do for a 2 dimensional array ? You'll have to wait for numpy for the most general 2-D, but for list-of-array: square = [array.array('H', (i * 100 + j for j in range(75))) for i in range(75)] square[4][8] -- http://mail.python.org/mailman/listinfo/python-list
Re: How to initialize an array with a large number of members ?
MRAB: > >>> # With a list > >>> tally = array('H', [0] * 75) > >>> > >>> # With a generator > >>> tally = array('H', (0 for i in range(75))) Time ago we have had a long discussion about this, the right way is: tally = array(someformat, [0]) * 75 (If you need to initialize it to something that isn't constant then you may have to do something different). Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: How to initialize an array with a large number of members ?
da...@bag.python.org wrote: Thanks to those who have helped a beginner in Python. Using version 3.0 # script23 from array import array < see failed initialization attempts below > tally = array('H',for i in range(75) : [0]) tally = array('H',[for i in range(75) : 0]) tally = array('H',range(75) : [0]) tally = array('H',range(75) [0]) Above give either Syntax error or TypeError All examples of sequences in docs show only a few members being initialized. Array doc says an iterator can be used, but doen't show how. What would you do for a 2 dimensional array ? Incorporate c code ? The online docs are clearly insufficient for a novice. Have ordered Summerfields new book. >>> # With a list >>> tally = array('H', [0] * 75) >>> >>> # With a generator >>> tally = array('H', (0 for i in range(75))) -- http://mail.python.org/mailman/listinfo/python-list