[LeetCode]65 有效数字

题目描述

验证给定的字符串是否为数字。

示例:

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

代码

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class Solution:
    def isInt(self, s):
        if s == '': return False
        if s[0] in ['+', '-']:
            s = s[1:]
        if s == '': return False
        for c in s:
            if c > '9' or c < '0':
                return False
        return True
    
    def isFloat(self, s):
        if s == '': return False
        if s[0] in ['+', '-']:
            s = s[1:]
        if s == '': return False
        if s == '.':
            return False
        if s.count('.') > 1:
            return False
        for c in s:
            if c == '.' or '0' <= c <= '9':
                continue
            else:
                return False
        return True

    def isNumber(self, s):
        """
        :type s: str
        :rtype: bool
        """
        s = s.strip()
        if len(s) == 0: return False
        data = s.split('e')
        if len(data) > 2:
            return False
        elif len(data) == 2:
            return self.isFloat(data[0]) and self.isInt(data[1])
        else:
            return self.isFloat(data[0])