Сортировать кортеж от первого элемента Python
a = [(5,8), (3,4), (9,7)]
#sort by first element in tuple
result = sorted(a, key=lambda tup: tup[0])
#OR to do inplace sort:
a.sorted(key = lambda tup: tup[0])
# output
[(3, 4), (5, 8), (9, 7)]
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