a="12345"
# method 1
print(a[::-1])
# method 2
from functools import reduce
print reduce((lambda x, y: y+x), a) # reduce is [ func(func(s1, s2),s3), ... , sn ]
# method 3
print "".join(reversed(a)) # reversed(object) return a iterator, type 'reversed', join(iterable)
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