Create a two-dimensional array at runtime: Difference between revisions
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{{works with|Python| 2.5}} |
{{works with|Python| 2.5}} |
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<lang python> |
<lang python>width = int(raw_input("Width of myarray: ")) |
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height = int(raw_input("Height of Array: ")) |
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myarray = [[0] * width for i in xrange(height)] |
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myarray[0][0] = 3.5 |
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print myarray[0][0]</lang> |
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'''Note:''' Some people may instinctively try to write myarray as [[0] * width] * height, but the * operator creates ''n'' references to [[0] * width] |
'''Note:''' Some people may instinctively try to write myarray as [[0] * width] * height, but the * operator creates ''n'' references to [[0] * width] |
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You can also use a two element tuple to index a dictionary like so: |
You can also use a two element tuple to index a dictionary like so: |
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<lang python> |
<lang python>myarray = dict(((w,h), 0) for w in range(width) for h in range(height)) |
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# or, in Python 3: myarray = {(w,h): 0 for w in range(width) for h in range(height)} |
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myarray[(0,0)] = 3.5 |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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