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