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First solution in Clear category for Swap Nodes by pokosasa
def swap_nodes(a):
last=[]
if len(a)%2!=0:
last=[a.pop()]
res=[]
while a:
e1=a.pop(0)
e2=a.pop(0)
res.extend([e2,e1])
res.extend(last)
return res
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!")
Feb. 7, 2020
