Python–百分比范围内的元素频率
给定一个元素列表和百分比范围，任务是编写一个 python 程序来提取频率在给定范围内的所有元素。
输入: test_list = [4，6，2，4，6，7，8，4，9，1，4，6，7，8]，strt，end = 13，25
输出:【6，7，8】
说明: 21.4、14.2、14.2 分别是 6、7、8 的百分比存在。
输入: test_list = [4，6，2，4，6，7，8，4，9，1，4，6，7，8]，strt，end = 13，20
输出:【7，8】
说明: 14.2、14.2 分别是 7、8 的百分比存在。
存在感百分比可以通过以下公式简单计算:
Frequency of the element present in the list/ total no. of elements in the list
方法#1:使用 计数器() + 设置() + 循环+T21】len()
在这种情况下，使用循环提取所有元素的频率。下一步是获取列表的元素集，并检查频率是否在指定的范围内。
Python 3
# Python3 code to demonstrate working of
# Element frequencies in percent range
# Using Counter() + set() + loop + len()
from collections import Counter
# initializing list
test_list = [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8]
# printing original list
print("The original list is : " + str(test_list))
# initializing percent ranges
strt, end = 13, 25
# getting frequencies
freqs = dict(Counter(test_list))
# computing percents and assigning
res = []
for ele in set(test_list):
percent = (freqs[ele] / len(test_list)) * 100
if percent >= strt and percent <= end:
res.append(ele)
# printing result
print("Elements within range of frequencies : " + str(res))
输出:
The original list is : [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8]
Elements within range of frequencies : [6, 7, 8]
方法 2:使用Counter()+循环+len() 这以几乎相似的方式执行任务，关键区别在于 Counter 键是迭代的，而不是列表元素，因为它们会提供相似的输出。
Python 3
# Python3 code to demonstrate working of
# Element frequencies in percent range
# Using Counter() + loop + len()
from collections import Counter
# initializing list
test_list = [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8]
# printing original list
print("The original list is : " + str(test_list))
# initializing percent ranges
strt, end = 13, 25
# getting frequencies
freqs = dict(Counter(test_list))
# computing percents and assigning
# iterating from dictionary
res = []
for ele in freqs:
percent = (freqs[ele] / len(test_list)) * 100
if percent >= strt and percent <= end:
res.append(ele)
# printing result
print("Elements within range of frequencies : " + str(res))
输出:
The original list is : [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8]
Elements within range of frequencies : [6, 7, 8]
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