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    • Home
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    • > Python

    Python initialize large list with same value

    on Apr 12, 2016

    To initialize a large list with same value (all items having same value), the following syntax can be used.

    a = [val] * num_items
    

    Example

    a = [0]*20
    print a
    
    a = [None]*20
    print a
    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
    [None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None]
    
    Env: Python 2.7.16

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    5. Python itertools imap examples
    6. Python value in array (list) check
    7. Python itertools ifilter examples
    8. Python list – append or prepend a value
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    Posted in Tutorials | Tagged Python, Python array, Python cookbook, Tutorials

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