leetcode: 65. Valid Number [✗]

# 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.

这是一道和算法无关的题，压根不值得花时间做。

class Solution():
    def isNumber(self, s):
        s = s.strip()
        if " " in s:
            return False
        if s.startswith('0') or s.lower().startswith('0b'):
            try:
                int(s, 2)
            except:
                pass
            else:
                return True
        if s.startswith('0'):
            try:
               int(s, 8)
            except:
                pass
            else:
                return True 
        if s.lower().startswith('0x'):
            try:
               int(s, 16)
            except:
                pass
            else:
                return True
        try:
           int(s, 10)
        except:
            pass
        else:
            return True
        try:
            float(s)
        except:
            pass
        else:
            return True

        return False


if __name__ == "__main__":
    assert Solution().isNumber(" 0.1 ") == True
    assert Solution().isNumber("abc") == False
    assert Solution().isNumber("1 a") == False
    assert Solution().isNumber("2e10") == True