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First solution in Clear category for Swap Nodes by PythonLearner
from typing import Iterable
def swap_nodes(sequence: Iterable) -> Iterable:
pair = []
for item in sequence:
pair.append(item)
if len(pair) == 2:
yield from reversed(pair)
pair = []
yield from reversed(pair)
if __name__ == '__main__':
print("Example:")
print(list(swap_nodes([1, 2, 3, 4])))
# These "asserts" are used for self-checking and not for an auto-testing
assert list(swap_nodes([1, 2, 3, 4])) == [2, 1, 4, 3]
assert list(swap_nodes([5, 5, 5, 5])) == [5, 5, 5, 5]
assert list(swap_nodes([1, 2, 3])) == [2, 1, 3]
assert list(swap_nodes([3])) == [3]
assert list(swap_nodes(["hello", "world"])) == ["world", "hello"]
print("Coding complete? Click 'Check' to earn cool rewards!")
Jan. 25, 2019