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def f(a,b,l):l[a],l[b]=l[b],l[a]
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Mutates the input in-place.
26 bytes with a NumPy array:
def f(l,a):l[a[::-1]]=l[a]
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def f(a,b,l):l[a],l[b]=l[b],l[a];print ll[a]
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def f(a,b,l):l[a],l[b]=l[b],l[a];print l
def f(a,b,l=input(l) :l[a],l[b]=l[b],l[a] printl[a];print l
a,b,l=input() l[a],l[b]=l[b],l[a] print l
