How to subtract two strings?

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执笔经年
执笔经年 2020-12-30 00:53

I have a long string, which is basically a list like str=\"lamp, bag, mirror,\" (and other items)

I was wondering if I can add or subtract some items, i

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  •  有刺的猬
    2020-12-30 01:08

    You can do this as long as you use well-formed lists:

    s0 = "lamp, bag, mirror"
    s = s0.split(", ") # s is a list: ["lamp", "bag", "mirror"]
    

    If the list is not well-formed, you can do as follows, as suggested by @Lattyware:

    s = [item.strip() for item in s0.split(',')]
    

    Now to delete the element:

    s.remove("bag")
    s
    => ["lamp", "mirror"]
    

    Either way - to reconstruct the string, use join():

    ", ".join(s)
    => "lamp, mirror"
    

    A different approach would be to use replace() - but be careful with the string you want to replace, for example "mirror" doesn't have a trailing , at the end.

    s0 = "lamp, bag, mirror"
    s0.replace("bag, ", "")
    => "lamp, mirror"
    

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