如何计算列表中一定范围内的元素？

Question

我需要计算字符串中有多少数字的值大于或等于 25 且小于或等于 50

numbers = [25, 24, 26, 45, 25, 23, 50, 51]

#  'count' should be 5 
count = 0

# I need to filter all numbers and only numbers what are higher than 25 can stay 

numbers = [25, 24, 26, 45, 25, 23, 50, 51]

#  'filtered' should be equal to [26, 45, 50, 51]
filtered = []

Answer 1

我需要过滤所有数字，只有大于 25 的数字才能保留

您可以使用内置函数filter：

numbers = [25, 24, 26, 45, 25, 23, 50, 51]
filtred = list(filter(lambda x : x > 25, numbers))
# [26, 45, 50, 51]

字符串中有多少数字的值大于或等于 25 且小于或等于 50

您可以使用内置函数sum：

count = sum(1 for e in numbers if e >= 25 and e<= 50)
# 5

Answer 2

numbers = [25, 24, 26, 45, 25, 23, 50, 51]
count = len(numbers)
filtered = [num for num in numbers if 25 < num <= 50]
count -= len(filtered)