编码和python的新功能。 试图强制类型（int）为浮点答案

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我尝试过round(tracks_left, 0)和int (tracks_left) 。 我究竟做错了什么？

Answer 1

round(tracks_left, 0)不会突变tracks_left，而是返回一个新值。 同样与int(tracks_left) 。

尝试：

tracks_left = round(tracks_left, 0)

要么：

tracks_left = int(tracks_left)

注意： int总是四舍五入。

Answer 2

round(tracks_left, 0)不会更改tracks_left 。 它只是返回值。 您必须将其分配给某些东西。

>>> 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

您也可以这样做：

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

您也可以尝试int ：

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

希望对您有所帮助！