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                >[success] # 數字類型 ~~~ 1.可以進行計算操作例如:+ - * / ** % 取余數 2.可以進行類型的轉換把字符串轉換成數字類型 ~~~ >[danger] ##### 簡單的案例 ~~~ int_num = 1 print(int_num, type(int_num)) str_num = "1" print(type(str_num), type(int(str_num))) 打印結果: 1 <class 'int'> <class 'str'> <class 'int'> ~~~ >[success] # 數字類型的方法bit_length ~~~ 1.bit_length() 一個數的二進制長度 2.一個數的二進制長度等于長度二的次冪加1 ~~~ >[danger] ##### 案例 反轉整數 * 示例 ~~~ 輸入: 123 輸出: 321 ~~~ ~~~ class Solution: def reverse(self, x): """ :type x: int :rtype: int """ flag = 0 if x > 0: flag = 1 else: flag = -1 s = str(abs(x))[::-1] n = int(s) * flag return n if n.bit_length() < 32 else 0 ~~~
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