Python3，可被三整除，typeError

Question

這應該很簡單。我想列出從1到50可以被3整除的所有數字：

a = [i for i in range(1,51) ] 

[i for i in a % 3 == 0] 
--------------------------------------------------------------------------- 
TypeError         Traceback (most recent call last) 
<ipython-input-50-42b9611b86db> in <module>() 
----> 1 [i for i in a % 3 == 0] 

TypeError: unsupported operand type(s) for %: 'list' and 'int' 

爲什麼我得到這個TypeError？

Answer 1

正如你可能想要的評論指出：

>>> [i for i in range(1, 51) if i % 3 == 0] # included an "if" 
[3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48] 

Alternativly你可以直接從修改range創建它們：

>>> [3 * i for i in range(1, 51 // 3)] 
[3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48] 

>>> list(range(3, 51, 3)) 
[3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48] 

在你的情況你得到TypeError因爲你用a % 3和a是list，不支持除法或模操作。