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# Python string concatenation
# Appending strings to an existing string is way faster than prepending.
# Source: https://groups.google.com/d/msg/comp.lang.python/AzYJ0LAWe-w/wBLtn5BJIBsJ
python -m timeit -s "v = 'x' * 10; out = ''" "out = out + v"
# prints: 10000000 loops, best of 3: 0.0511 usec per loop
python -m timeit -s "v = 'x' * 10; out = ''" "out = v + out"
# prints: 100000 loops, best of 3: 52.7 usec per loop
python -m timeit -s "v = 'x' * 10; out = ''" "out += v"
# prints: 10000000 loops, best of 3: 0.053 usec per loop
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