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Python 2022-01-29 04:46:39
dictionary changed size during iteration
# to avoid this problem, make a copy of keys: for i in list(d) # Can also solve this problem here: # https://leetcode.com/problems/binary-trees-with-factors/ arr = [2,4,5,10] dp = collections.defaultdict(int) # this would create error since dp[x/i] is... Add solution -
Python 2021-09-30 15:29:03
python counter nested dictionary
import collections a = collections.defaultdict(collections.Counter) inf = [('fruit','apple'),('car','truck'),('fruit','banana'),('fruit','banana')] for category,item in inf: a[category][item] = a[category][item] + 1 #print(a) #{'fruit': Counter({'b... Add solution
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