列表中值的数量大于一定数量 [英] number of values in a list greater than a certain number

问题描述

我有一个数字列表，我想获取一个数字在满足特定条件的列表中出现的次数.我可以使用列表推导(或函数中的列表推导)，但我想知道是否有人可以使用更短的方法.

I have a list of numbers and I want to get the number of times a number appears in a list that meets a certain criteria. I can use a list comprehension (or a list comprehension in a function) but I am wondering if someone has a shorter way.

# list of numbers
j=[4,5,6,7,1,3,7,5]
#list comprehension of values of j > 5
x = [i for i in j if i>5]
#value of x
len(x)

#or function version
def length_of_list(list_of_numbers, number):
     x = [i for i in list_of_numbers if j > number]
     return len(x)
length_of_list(j, 5)

还有更精简的版本吗?

推荐答案

您可以执行以下操作:

>>> j = [4, 5, 6, 7, 1, 3, 7, 5]
>>> sum(i > 5 for i in j)
3

最初将True添加到True似乎很奇怪，但是我并不认为这很奇怪.毕竟，bool 是自2.3版以来所有版本中int的子类:

It might initially seem strange to add True to True this way, but I don't think it's unpythonic; after all, bool is a subclass of int in all versions since 2.3:

>>> issubclass(bool, int)
True

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