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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 2022-01-26 08:51:24
pandas add count of repeated elements from column
# Basic syntax: # Get counts of duplicated elements in one column: dataframe.pivot_table(index=['column_name'], aggfunc='size') # Get counts of duplicated elements across multiple columns: dataframe.pivot_table(index=['column_1', 'column_2',...], aggfunc=... Add solution -
Python 2022-01-25 20:05:29
Return an RDD containing all pairs of elements with matching keys in self and other.
x = sc.parallelize([("a", 1), ("b", 4)]) y = sc.parallelize([("a", 2), ("a", 3)]) sorted(x.join(y).collect()) # [('a', (1, 2)), ('a', (1, 3))] Add solution