Valid Number

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Validate if a given string is numeric.

Some examples:
"0" => true
" 0.1 " => true
"abc" => false
"1 a" => false
"2e10" => true

Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before implementing one.

class Solution:
    # @param s, a string
    # @return a boolean
    def isNumber(self, s):
        try:
            float(s)                 
            return True                
        except:
            return False

Valid Number

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原文地址：http://www.cnblogs.com/code-swan/p/4139438.html