[英]Insert a list of numbers into a dictionary
Following on from my previous question: here I Asked how to check if current element it's smaller than the next elements and count them.继我之前的问题之后: here I Asked how to check if current element is小于下一个元素并计算它们。
Now, I want to do something else, I want to create a dictionary that stores the values in the following way:现在,我想做其他事情,我想创建一个字典,以下列方式存储值:
input:输入:
A = [5, 4, 3, 2]
output: output:
{'key_5': [4,3,2], 'key_4': [3,2], 'key_3': [1], 'key_2': [0]}
Explanation:解释:
A = [5, 4, 3, 2]
res = {}
dp = [0]*len(A)
for i in range(len(A)):
for j in range(i, len(A)):
if A[i] > A[j]:
dp[i] += 1 #Counts how many times each element appears in the list.
res[f'key_{A[i]}'] = A[j] #Trying to add elements to dictionary.
print(res)
And my output is:而我的 output 是:
{'key_5': 2, 'key_4': 2, 'key_3': 2}
Using dict/list comprehensions:使用 dict/list 理解:
>>> A = [5, 4, 3, 2]
>>> {f"key_{n}": [i for i in A if i < n] or [0] for n in A}
{'key_5': [4, 3, 2], 'key_4': [3, 2], 'key_3': [2], 'key_2': [0]}
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