Using the '+' operator for string concatonation can be slow, especially
when done many times in a loop.
> pi = pi + str("%04d" % int(e + d/a)) ## this should be fast?! I dont
The accepted solution would be to make pi an array and append to the
end...
pi = [] #create the array (empty)
...
...
pi.append(str("%04d"%int(e+d/a))) # append to it
And when it is time to print the results do the following:
print "".join(pi)
It may look strange, but it is a common Python idiom. You might also
look into an optimizer such as psycho: http://psyco.sourceforge.net/.
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