sums = [kd for k in keyboards for d in drivers for kd in (k + d,) if d <= upper_limit]
也可以使用生成器表达式:
^{pr2}$
在后一种情况下,可以先将该表达式存储为单独的变量:
kd_calc = (k + d for k in keyboards for d in drivers)
sums = [kd for kd in kd_calc if kd <= upper_limit]
演示:
>>> keyboards = [3, 1]
>>> drivers = [5, 2, 8]
>>> upper_limit = 10
>>> [kd for k in keyboards for d in drivers for kd in (k + d,) if d <= upper_limit]
[8, 5, 11, 6, 3, 9]
>>> [kd for kd in (k + d for k in keyboards for d in drivers) if kd <= upper_limit]
[8, 5, 6, 3, 9]
>>> kd_calc = (k + d for k in keyboards for d in drivers)
>>> [kd for kd in kd_calc if kd <= upper_limit]
[8, 5, 6, 3, 9]
在列表理解中,只有
for
循环可以分配给一个新名称,因此,如果需要一个“local”变量来引用计算,则需要找到添加额外循环的方法。在您可以在计算
k + d
的单个元素元组上添加另一个循环:也可以使用生成器表达式:
^{pr2}$在后一种情况下,可以先将该表达式存储为单独的变量:
演示:
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