編碼和python的新功能。 試圖強制類型（int）為浮點答案

Question

balance = 50 - 0.12 * 15
tracks_left = balance / 0.12
round (tracks_left, 0)
print 'you have', tracks_left,"to download"

答案是you have 401.666666667 to download我嘗試過round(tracks_left, 0)和int (tracks_left) 。 我究竟做錯了什么？

Answer 1

round(tracks_left, 0)不會突變tracks_left，而是返回一個新值。 同樣與int(tracks_left) 。

嘗試：

tracks_left = round(tracks_left, 0)

要么：

tracks_left = int(tracks_left)

注意： int總是四舍五入。

Answer 2

round(tracks_left, 0)不會更改tracks_left 。 它只是返回值。 您必須將其分配給某些東西。

>>> balance = 50 - 0.12 * 15
>>> tracks_left = balance / 0.12
>>> tracks_left_rounded = round(tracks_left, 0)
>>> print('You have', tracks_left_rounded)
You have 402.0

您也可以這樣做：

>>> balance = 50 - 0.12 * 15
>>> tracks_left = round(balance / 0.12)

您也可以嘗試int ：

>>> tracks_left_rounded = int(tracks_left)
>>> print('You have', tracks_left_rounded)
You have 401

希望對您有所幫助！