>>> S='spammy'
>>> L=list(S)
>>> L
['s', 'p', 'a', 'm', 'm', 'y']
>>> L[3]='x'
>>> L[4]='x'
>>> S=''.join(L)
>>> S
'spaxxy'



>>> '&'.join(['eggs','sauage','ham','toast'])
'eggs&sauage&ham&toast'

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