Python - reduce

Original Sources:

• Youtube by ‘Real Python’

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Used in this file:

• Python - lambda Functions
• Python - zip
• Python - List as Positional Args

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Typical use: from tuple_vectort ⇒ get one_element

~ Ex.:

from functools import reduce
vector = (1,2,3,4,5)
element = reduce(lambda acc, val: acc - val, *vector)
element = -13 # ((((1-2)-3)-4)-5)

~ Ex.:

from functools import reduce
def count(acc, val):
	if not acc.has_key(val):
		acc[val] = 1
	else:
		acc[val] += 1
	return acc
	
a = (1,2,1,2,3,4,1,2,3,5,6,3,2)
d = reduce(count, a, dict())
"""
d = {
	1: 3
	2: 4
	3: 3
	4: 1
	5: 1
	6: 1
}
"""

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