Python–因子频率字典
原文:https://www . geesforgeks . org/python-factors-frequency-dictionary/
给定一个包含元素的列表,构建一个包含频率因子的字典。
输入 : test_list = [2,4,6,8] 输出 : {1: 4,2: 4,3: 1,4: 2,5: 0,6: 1,7: 0,8: 1} 解释:所有因子都被映射,例如 2 可以被所有 4 个值整除,因此被映射为 4。
输入:test _ list =【1,2】 输出 : {1: 2,2 : 1} 解释:同上,1 为全因子。
方法#1:使用循环
这是执行这项任务的粗暴方式。在这种情况下,对元素进行迭代,并检查所需的数量是否是一个因素,如果是,则在与其关键字对应的字典中增加其频率。
Python 3
# Python3 code to demonstrate working of
# Factors Frequency Dictionary
# Using loop
# initializing list
test_list = [2, 4, 6, 8, 3, 9, 12, 15, 16, 18]
# printing original list
print("The original list : " + str(test_list))
res = dict()
# iterating till max element
for idx in range(1, max(test_list)):
res[idx] = 0
for key in test_list:
# checking for factor
if key % idx == 0:
res[idx] += 1
# printing result
print("The constructed dictionary : " + str(res))
Output
The original list : [2, 4, 6, 8, 3, 9, 12, 15, 16, 18]
The constructed dictionary : {1: 10, 2: 7, 3: 6, 4: 4, 5: 1, 6: 3, 7: 0, 8: 2, 9: 2, 10: 0, 11: 0, 12: 1, 13: 0, 14: 0, 15: 1, 16: 1, 17: 0}
方法 2:使用 sum() +循环
这几乎与上述问题相似。差 sum()用于求和,而不是用于解决问题的手动循环。
Python 3
# Python3 code to demonstrate working of
# Factors Frequency Dictionary
# Using sum() + loop
# initializing list
test_list = [2, 4, 6, 8, 3, 9, 12, 15, 16, 18]
# printing original list
print("The original list : " + str(test_list))
res = dict()
for idx in range(1, max(test_list)):
# using sum() instead of loop for sum computation
res[idx] = sum(key % idx == 0 for key in test_list)
# printing result
print("The constructed dictionary : " + str(res))
Output
The original list : [2, 4, 6, 8, 3, 9, 12, 15, 16, 18]
The constructed dictionary : {1: 10, 2: 7, 3: 6, 4: 4, 5: 1, 6: 3, 7: 0, 8: 2, 9: 2, 10: 0, 11: 0, 12: 1, 13: 0, 14: 0, 15: 1, 16: 1, 17: 0}
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