A question about string and float number

[Wei Guo]

Hi all,

I am new of python. Could anyone help me a question as below?

Is there any function that can judge a string s is a float number or not?
FOr example, if s = '1.232' or s='1e+10', then it returns true, otherwise,
it will return false.

isdigit() in string doesn't work. float() will throw an exception and I just
need true or false as result.

Thanks a lot in advance,

Wei
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