If I have the following data in txt, how can I read the number 100?

General Usage
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100    # the number 100
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If it’s just a raw string, try parse(Int, split(str)[1]).
If it’s in a file, use parse(Int, readuntil("filename.txt", '#'))

readdlm is a good general solution for this sort of application: readdlm("filename.txt")[1]

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thank u very much!!!