manipulate string

[Skip Montanaro]

    >>> s = "0123456789"
    >>> " - ".join([s[i] for i in range(0, 10, 2)])
    '0 - 2 - 4 - 6 - 8'

I thought the original poster wanted the odd numbers replaced by '-' and then
all elements separated by spaces.  None of the ' - '.join(...) examples
achieve that, as they fail to replace '9' with '-'.  Here's an alternative
which does:

    >>> s = "0123456789"
    >>> [int(c)%2 and '-' or c for c in s]
    ['0', '-', '2', '-', '4', '-', '6', '-', '8', '-']
    >>> ' '.join([int(c)%2 and '-' or c for c in s])
    '0 - 2 - 4 - 6 - 8 -'

Skip