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Find the year with the most number of people alive in Python

from collections import Counter
from itertools import accumulate
import operator

def most_populated(population, single=True):
delta = Counter(x[0] for x in population)
delta.subtract(Counter(x[1]+1 for x in population))
start, end = min(delta.keys()), max(delta.keys())
years = list(accumulate(delta[year] for year in range(start, end)))
return max(enumerate(years), key=operator.itemgetter(1))[0] + start if single else \
[i + start for i, val in enumerate(years) if val == max(years)]


print(most_populated([(1920, 1939), (1911, 1944),(1920, 1955), (1938, 1939)]))

v2 ————————————-

>>> from collections import Counter
>>> from itertools import chain
>>> def most_pop(pop):
... pop_flat = chain.from_iterable(range(i,j+1) for i,j in pop)
... return Counter(pop_flat).most_common()
...
>>> most_pop([(1920, 1939), (1911, 1944), (1920, 1955), (1938, 1939)])[0]